ADS794xEVM and ADS794xEVM-PDK User s Guide '

User

'

s Guide

SBAU194

–

August 2011

ADS794xEVM and ADS794xEVM-PDK

ADS794xEVM-PDK

This user's guide describes the characteristics, operation, and use of the ADS794xEVM by itself and as part of the ADS794xEVM-PDK kit. These evaluation modules (EVMs) allow evaluation of all aspects of either the ADS7946 or ADS7945 devices (ADS794x). Both devices are 14-bit, dual-channel, ultralow-power, differential successive-approximation-register (SAR) analog-to-digital converters (ADCs) with a maximum throughput rate of 2 MSPS. The ADS7945 offers fully-differential input voltages while the pseudo-differential inputs of the ADS7946 offer single-ended input voltages with small common-mode noise-cancelling capabilities. Complete circuit descriptions, schematic diagrams, and bill of materials are included in this document.

The following related documents are available through the Texas Instruments web site at http://www.ti.com

.

Related Documentation

Literature Number Device

ADS7945

ADS7946

OPA350

OPA836

REF5040

SN74LVC2G74

SBAS539

SBOS099C

SLOS712B

SBOS410E

SCES203M

ADCPro is a trademark of Texas Instruments.

Microsoft, Windows are registered trademarks of Microsoft Corporation.

I

SPI is a trademark of Motorola, Inc.

2

C is a trademark of NXP Semiconductors.

All other trademarks are the property of their respective owners.

SBAU194 – August 2011

Submit Documentation Feedback

Copyright © 2011, Texas Instruments Incorporated

ADS794xEVM and ADS794xEVM-PDK

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Contents

EVM Overview

Analog Interface

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Digital Interface

Power Supplies

EVM Operation

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ADS794xEVM-PDK: Software Installation

ADS794xEVM-PDK Kit Operation

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Bill of Materials, Schematics, and Layout

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List of Figures

ADS794xEVM and ADS7945 Analog Inputs

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ADS794xEVM and ADS7946 Analog Inputs

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ADS794xEVM Default Jumper Locations

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ADS794xEVM-PDK Plug-In Installer

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Completed ADS794xEVM-PDK Installer

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MMB0 Jumper Locations

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Connecting ADS794xEVM to MMB0

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Powering Up ADS794xEVM-PDK

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NI-VISA Driver Installation Prompt

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Loading ADS794xEVM Plug-in From ADCPro

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USBStyx Driver Installation Prompt

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ADS794xEVM Plug-in: Device Configuration Tab

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ADCPro Test Plug-ins

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ADS794xEVM PCB: Top Layer

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ADS794xEVM PCB: Ground Layer

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ADS794xEVM PCB: Power Layer

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ADS794xEVM PCB: Bottom Layer

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List of Tables

P2: Analog Interface Pinout (Samtec 10 x 2)

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SMA Analog Inputs

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P1: Serial Interface Header

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P3 Configuration: Power-Supply Interface Header

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ADS794xEVM Bill of Materials

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1 EVM Overview

EVM Overview

1.1

Features

ADS794xEVM Features:

• Contains all support circuitry needed for the ADS7946/ADS7945 (ADS794x)

• 5-V, 3.3-V, and 1.8-V logic compatible with 16-bit, 40-MHz SPI ™ serial interface

• Simple channel selection with a single 16-bit word command

• Serial interface header for easy connection to TI DSP-based communication systems

• Compatible with the TI Modular EVM System

• Voltage reference options: onboard REF5040 (4.096-V) reference or external reference

• Voltage reference buffering with OPA350

•

Onboard OPA836 (200-MHz BW, 1-mA quiescent current) ADC input drivers

• Jumper-selectable bipolar ( – V

REF

/2 to +V

REF

/2) or unipolar (0 V to V

REF

) input range

ADS794xEVM-PDK Features:

• Easy-to-use evaluation software for Microsoft

®

Windows

®

XP operating system PCs

• Data collection to text files

• Built-in analysis tools including scope, FFT, and histogram displays

•

Complete control of board settings

• Easily expandable with new analysis plug-in tools from Texas Instruments

The ADS794xEVM-PDK is available for use with a computer. This kit combines the ADS794xEVM board with the DSP-based MMB0 motherboard, and includes ADCPro ™ software for evaluation.

The MMB0 motherboard allows the ADS794xEVM to be connected to the computer via an available USB port. This manual shows how to use the MMB0 as part of the ADS794xEVM-PDK, but does not provide technical details about the MMB0 itself.

ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is based on a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.

The ADS794xEVM-PDK is controlled by a plug-in running in ADCPro. For more information about

ADCPro, see the ADCPro ™ Analog-to-Digital Converter Evaluation Software User ' s Guide (literature number SBAU128 ), available for download from the TI web site.

This manual covers the operation of both the ADS794xEVM and the ADS794xEVM-PDK. Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the ADS794xEVM.

Operation of the EVM and kit for both the ADS7946 and the ADS7945 devices is identical, unless otherwise noted.

1.2

Introduction

The ADS794xEVM is an evaluation module built to the TI Modular EVM System specifications. It can be connected to any modular EVM system interface card.

The ADS794xEVM is available as a stand-alone printed circuit board (PCB) or as part of the

ADS794xEVM-PDK, which includes an MMB0 motherboard and software. As a stand-alone PCB, the

ADS794xEVM is useful for prototyping designs and firmware because it offers circuitry that meets the product data sheet specifications of either the ADS7946 or ADS7945 devices.

The ADS7945 and ADS7946 are 14-bit, 2-MSPS ADCs with fully differential and pseudo-differential unipolar inputs, respectively. These devices operate at a 2-MSPS sample rate with a 16-clock SPI data frame that features both outstanding dc and excellent dynamic performance. These devices also include a two-channel input multiplexer and a low-power SAR ADC with an inherent sample-and-hold (S/H) input stage. During normal operation at 2 MSPS, the ADS794x dissipates a mere 11.6 mW.

Note that the ADS794xEVM has no microprocessor and cannot run software. Therefore, some type of interface is required to connect the ADS794xEVM to a computer. In the ADS794xEVM-PDK kit, the MMB0 motherboard serves as the interface between the computer and the ADS794xEVM board.





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Analog Interface

2 Analog Interface

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The ADS794xEVM is designed for easy interfacing to multiple analog sources. SMA connectors allow the

EVM to have input signals connected via coaxial cables. In addition, the Samtec connector provides a convenient 10-pin, dual-row, header/socket combination at P2. This header/socket provides access to the analog input pins of the ADS794x. Consult Samtec at http://www.samtec.com

or call 1-800-SAMTEC-9 for a variety of mating connector options. All analog inputs are buffered by OPA836 high-speed operational amplifiers in order to properly drive the ADS794x ADC inputs.

Use appropriate caution when handling these pins.

Table 1

summarizes the pinout for analog interface P2.

Pin Number

P2.2

P2.4

P2.10

Table 1. P2: Analog Interface Pinout (Samtec 10 x 2)

P2.12

P2.1-19 (odd)

P2.6 and P2.8

P2.14, P2.16, and P2.18

P2.15

P2.20

Signal

A0(+) / OPEN

A0( – )

A1(+) / OPEN

A1( – )

GND

GND

GND

V

REF

/4 or V

REF

/2

Ext V

REF

Description

CH0 positive differential input for ADS7945; open if

ADS7946 is installed

CH0 negative differential input for ADS7945; single-ended input for ADS7946

CH1 positive differential input for ADS7945; open if

ADS7946 is installed


Analog ground connections (except J1.15)

Analog ground connections

Analog ground connections

Unbuffered output. V

REF

/4 (J6 open) or V

REF

/2 (J6 closed)

External reference voltage input

Table 2

lists the SMA analog inputs.

Pin Number

J10

J11

J4

J5

Table 2. SMA Analog Inputs

Signal

A0(+) / No SMA

A0( – )

A1(+) / No SMA

A1( – )

Description

CH0 positive differential input for ADS7945; no

SMA if ADS7946 is installed


CH1 positive differential input for ADS7945; no

SMA if ADS7946 is installed


As noted in

Table 1

and

Table 2 , there are different hardware configurations depending on the installed

converter. The ADS7945 uses two inputs per channel because of its fully differential inputs. The ADS7946 uses one input per channel for its pseudo-differential inputs.

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Analog Interface

2.1

ADS794xEVM Analog Inputs with ADS7945 Installed

Each channel of the ADS7945 uses two OPA836 operational amplifiers to drive the fully differential inputs.

The input signals can be applied to either the SMA or P2 header connectors. These operational amplifiers offset the input signal to use an inverting configuration with a single supply. The

EVM Operation

section explains in detail how this offset is used to allow bipolar signals for the ADS7945 with jumper J6.

Figure 1

illustrates the ADS794xEVM analog inputs with the ADS7945 installed.

ADS7945

SMA

J10

OPA836 in Inverting

Configuration

AIN0N (pin 6)

P2

A0(+)

4


Configuration

AIN0P (pin 5)

SMA

J11

10

A1(+)

12

SMA

J4


Configuration

AIN1N (pin 7)


Configuration

AIN1P (pin 8)

SMA

J5

Figure 1. ADS794xEVM and ADS7945 Analog Inputs





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Analog Interface

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2.2

ADS794xEVM Analog Inputs with ADS7946 Installed

Each channel of the ADS7946 uses one OPA836 to drive a single-ended input voltage. The input signals can be applied to either the SMA or P2 header connectors. These operational amplifiers offset the input signal to use an inverting configuration with a single supply. The

EVM Operation

section explains in detail how this offset is used to allow bipolar signals for the ADS7946 with jumper J6.

Figure 2

shows the ADS794xEVM analog inputs with the ADS7946 installed.

ADS7946

No SMA

J10

Open AIN0N (pin 6)

P2

A0(+)

4


Configuration

AIN0P (pin 5)

SMA

J11

10

A1(+)

12

No SMA

J4

Open

AIN1N (pin 7)


Configuration

AIN1P (pin 8)

SMA

J5

Figure 2. ADS794xEVM and ADS7946 Analog Inputs

2.3

External Reference Input

Pin P2.20 is an analog input for an external reference voltage when J2 is in position 2-3. The source that provides this external reference should have a voltage between 2.5 V and the analog power-supply voltage.

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3 Digital Interface

Digital Interface

Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-L-DV-P provide a convenient 10-pin, dual-row, header/socket combination at P1. This header/socket provides access to the digital control pins of the ADC. Consult Samtec at http://www.samtec.com

or call 1-800-SAMTEC-9 for a variety of mating connector options.

Table 3

summarizes the pinouts for digital interface P1.

Pin Number

P1.1

P1.3

P1.7

P1.11

P1.13

P1.19

P1.4, P1.10, and P1.18

P1.16, P1.20

P1.2, P1.5-6, P1.8-9,

P1.12, P1.14-15, and

P1.17

Table 3. P1: Serial Interface Header

Signal

CS

SCLK

CS

SDI or MOSI

SDO or MISO

PDEN

GND

I

2

C ™ bus

Description

Chip select input. Pulled high with 10-k Ω resistor.

Serial clock input

Chip select input. This pin is intended to be used by the MMB0 motherboard

SDI or MOSI input

SDO or MISO output

Power-down input (active high). Pulled down with

10-k Ω resistor.

Digital ground connections

I

2

C bus; used only used to program the U4

EEPROM on the EVM board

Unused Unused

3.1

Serial Interface (SPI)

The ADS794x ADC uses SPI serial communication in mode 0 (CPOL = 0, CPHA = 0). Because the serial clock (SCLK) frequency can be as fast as 40 MHz, the ADS794xEVM offers 47Ω resistors between the

SPI signals and P1 to aid with signal integrity. Typically, in high-speed SPI communication, fast signal edges can cause overshoot; these 47Ω resistors slow down the signal edges in order to minimize signal overshoot.

3.2

ADS794x Channel Select as SDI (MISO)

The ADS794x ADC offers direct control over the internal multiplexer using pin 11. The ADS794xEVM uses a flip-flop (see U9 in the attached schematic) to convert this pin into a typical SPI SDI (MOSI) pin. This architecture takes advantage of the SPI full-duplex data transmission sequence to control channel selection at the same time conversion data are acquired. The digital word 0x000 can be used to select channel 0, and the word 0xFFFF can be used to select channel 1.

3.3

I

2

C Bus for Onboard EEPROM

The ADS794xEVM has an I

2

C bus to communicate with the onboard EEPROM that records the board name and assembly date. It is not used in any form by the ADS794x converter.





7

Power Supplies

4 Power Supplies

P3 is the power-supply input connector.

Table 4

lists the configuration details for P3.

Table 4. P3 Configuration: Power-Supply Interface Header

Pin Number

P3.3

P3.5

P3.6

P3.7

P3.9

P3.10

P3.1-2, P3.4, and

P3.7-8

Pin Name

+5VA

GND

GND

+1.8VD

+3.3VD

+5VD

Unused

Function

5-V analog supply

Digital ground input

Analog ground input

1.8-V digital supply

3.3-V digital supply

5-V digital supply

Unused

Required

Yes

Yes

Yes

Yes/Optional

Yes/Optional

Yes/Optional

No www.ti.com

4.1

Analog Power Options

The ADS794xEVM board is designed to work with a 5-V analog power supply connected to P3.3.

4.2

Digital Power Options

The ADS794xEVM uses a jumper in J3 to connect the digital power supply to either +3.3 VD (P3.10) or +5

VD (P3.9). J3 in position 1-2 connects the digital power supply to +5 VD; position 2-3 connects the digital power supply to +3.3 VD. Without a jumper in J3, the digital power supply can be connected to +1.8

VD(P3.7) with a jumper wire to pin J3.2. The jumper in J3 must always be in position 2-3 (+3.3 VD) while using the MMB0 with the EVM.

4.3

Reference Voltages

The ADS794xEVM uses a jumper in J2 to select between the internal (REF5040) and external voltage reference sources. J2 in position 1-2 selects the internal reference; position 2-3 selects the external reference. The selected reference is cleaned with a RC filter and buffered with a OPA350 operational amplifier.

CAUTION

Digital supply and reference voltage must be at or below the analog supply voltage at all times.

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5 EVM Operation

EVM Operation

This section provides information on the analog input, digital control, and general operating conditions of the ADS794xEVM without the MMB0 motherboard. Software operation is presented in

Section 7 .

5.1

Analog Input

The ADS794xEVM offers three different analog input modes, selectable with jumper J6 and the type of input signal. Note that the ADS794x converter by itself only allows dc-coupled unipolar signals. The two additional input modes are available because OPA836 operational amplifiers drive the analog inputs. It is preferable for external signal drivers or filters to have low output impedance to reduce gain errors.

Mode 1: DC-Coupled Unipolar Inputs (J6 Closed)

DC-coupled unipolar signals are typically produced by single-supply signal drivers. To allow dc-coupled unipolar signals, J6 should be closed. This mode allows an input signal range from 0 V to V analog inputs. In this mode, the voltage read at the ADC is equal to (V

REF

– V

IN

).

REF for all EVM

Mode 2: DC-Coupled Bipolar Inputs (J6 Open)

DC-coupled bipolar signals are typically produced by dual-supply signal drivers. To allow dc-coupled bipolar signals, J6 should be open. This mode allows an input signal range from – V

REF

/2 to +V

REF

/2 for all

EVM analog inputs. In this mode, the voltage read at the ADC is equal to (V

REF

/2 – V

IN

).

Mode 3: AC-Coupled Inputs (J6 Closed)

AC-coupled signals are typically produced by high-pass filters. To allow ac-coupled bipolar signals, J6 should be closed. This mode allows an input signal range from – V

REF

/2 to +V

REF

/2 for all EVM analog inputs. In this mode, the voltage read at the ADC is equal to (V

REF

/2 – V

IN

).

5.2

Digital Control

The digital control signals can be applied directly to the P1 header (top or bottom side). The modular

ADS794xEVM can also be connected directly to a DSP or microcontroller interface board, such as the

5-6K Interface or HPA-MCU Interface boards available from Texas Instruments, or the MMB0 if purchased as part of the ADS794xEVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the ADS794x, see the relevant product folder on the TI web site.





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ADS794xEVM-PDK: Software Installation

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5.3

Default Jumper Settings

Figure 3

shows the jumper locations on the EVM board and the respective factory default conditions for each.

6

Figure 3. ADS794xEVM Default Jumper Locations

There are four jumpers on the ADS794xEVM board. These jumpers are used to set the CS signal entry pin (J1), select the digital logic level (J3), select the reference (J2), and to establish the input signal range type (J6). The default parameters are:

• The CS signal entry pin is P1.7 (J1: 2-3).

• The logic level is 3.3 V (J3: 2-3).

• The onboard 4.096 V is selected as the reference voltage (J1: 1-2).

• Analog input range is 0 V to V

REF

(4.096 V) with dc-coupled signals (J6: closed)

ADS794xEVM-PDK: Software Installation

This section presents the steps required to the install the software.

Section 7

explains how to operate the software to acquire data.

Complete the following steps to install the software:

Step 1.

Install the ADCPro software (if not already installed) on a PC.

Step 2.

Install the ADS794xEVM-PDK EVM plug-in software.

Step 3.

Set up the ADS794xEVM-PDK hardware.

Step 4.

Power up the ADS794xEVM-PDK.

Step 5.

Connect the ADS794xEVM-PDK to the computer with a USB cable.

Step 6.

Complete the USB driver installation process.

Each task is described in the subsequent sections of this document.

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6.1

Installing the ADCPro Software


CAUTION

Do not connect the ADS794xEVM-PDK to a PC before completing

Section 6.2

through

Section 6.4

. Failure to observe this caution may cause Microsoft

Windows to not recognize the ADS794xEVM-PDK as a connected device.

ADCPro is the primary program used to evaluate ADCs. The latest software version of ADCPro is available from the TI website at www.ti.com

. Refer to the ADCPro User Guide for instructions on installing and using ADCPro.

6.2

Installing ADS794xEVM-PDK Plug-In Software

The ADS794xEVM-PDK plug-in uses ADCPro; you must install ADCPro before uploading the plug-in.

To install the ADS794xEVM-PDK plug-in, run the file: ads794X-adcproplugin- <

version #

>

.exe (

<

version

#

> refers to the installation file version number, and increments with software version releases).

Double-click the file to run it; then follow the instructions as shown. You can also use the ADCPro Update

Check feature to check for newer versions of the ADS794xEVM-PDK plug-in, once you have installed a version of it.

Figure 4

and

Figure 5

show the initial and completed installer screenshots, respectively.

Figure 4. ADS794xEVM-PDK Plug-In Installer

Figure 5. Completed ADS794xEVM-PDK Installer





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6.3

Configuring the ADS794xEVM-PDK Hardware

The ADS794xEVM-PDK contains both the ADS794xEVM and the MMB0 motherboard; however, the devices may be shipped unconnected or configured incorrectly. Follow these steps to verify that

ADS794xEVM-PDK kit is properly configured and connected.

Step 1.

Unpack the ADS794xEVM-PDK kit.

Step 2.

Set the three jumpers on the MMB0 REV D as shown in

Figure 6 . Below Figure 6

, there is a check list that explains the functionality of each jumper.

Figure 6. MMB0 Jumper Locations

Follow this check list to ensure proper operation of the MMB0 with the ADS794xEVM:

•

J12 must be closed. This setting allows the wall supply to power up the MMB0 and the

ADS794xEVM through J2 (6-VDC input), and regulate down to +5 V, 3.3 V, and 1.8 V.

• J13B must be closed. This configuration connects the 5-V analog power supply with the 5-V digital power supply.

• J13A must be opened. This setting allows the 5-V analog power supply to be regulated onboard.

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Step 3.

Plug the ADS794xEVM into the MMB0, as

Figure 7

illustrates.

Figure 7. Connecting ADS794xEVM to MMB0

CAUTION

Do not misalign the pins when plugging the ADS794xEVM into the MMB0.

Check the pin alignment carefully before applying power to the PDK.

Step 4.

Set jumper J3 on the ADS794xEVM to position 2-3 in order to set the ADS794xEVM logic voltage to 3.3 V. The MMB0 uses 3.3-V logic to communicate with the ADS7945xEVM.

Step 5.

Set jumper J1 on the ADS794xEVM to position 2-3 in order to place the CS signal in P1.7 of the EVM. The MMB0 sends the CS signal via P1.7.

Step 6.

Set jumper J2 on the ADS794xEVM to position 1-2 if the 4.096-V internal (onboard) reference is used. If an external reference is used, set J2 to the 2-3 position.

CAUTION

If an external reference is used, please do not apply external reference voltage before the power is applied to the MMB0 motherboard.

Step 7.

Set jumper J6 to match the correct type of input signal, as explained in

Section 5.1

:

• For dc-coupled unipolar input signals, J6 must be closed.

• For dc-oupled bipolar input signals, J6 must be opened.

• For ac-coupled signals, J6 must be closed.





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6.4

Powering Up the ADS794xEVM-PDK

Once the ADS794xEVM-PDK kit is configured, power can be applied to the MMB0. This power comes from a wall supply that delivers +6 VDC to the MMB0 via J2 on the MMB0 motherboard. This wall power supply is included with the PDK; it should be connected where

Figure 8

indicates.

Figure 8. Powering Up ADS794xEVM-PDK

After the power supply is connected, four green LEDs in the bottom right-hand corner of the MMB0 motherboard should light up. If these LEDs do not light up, disconnect the power and verify that J12 is closed.

6.5

First-Time Connection: ADS794xEVM-PDK to PC, Completing Driver Installation

The first time that the ADS794xEVM-PDK kit is connected to the PC via USB, the PC prompts the user for two drivers. At this point, it is presumed that the ADCPro software and the ADS794xEVM plug-in have been installed, and that the ADS794xEVM-PDK kit is properly configured and powered up (refer to

Section 6.1

through

Section 6.4

). The following sections show how to install these drivers.

NOTE:

Driver prompts may not appear if another PDK kit has been used on the PC before.

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6.5.1

NI-VISA USB Device Driver Installation

Follow these procedures to install the NI-VISA USB device driver, if prompted.

Step 1.

With power applied to the PDK kit, connect the PDK kit to the PC via USB.

Step 2.

The computer should recognize the new hardware and prompt the user for drivers, as shown in

Figure 9 . This driver should be present in the PC hard drive with the ADCPro files. Direct

the PC to search the driver and install it by clicking Next -- > at every prompt.

Figure 9. NI-VISA Driver Installation Prompt

6.5.2

USBStyx Driver Installation

The USBStyx driver prompt only appears when the ADCPro software uses the ADS794xEVM plug-in to communicate with the PDK hardware for the first time. Follow these procedures to install the USBStyx driver.

Step 1.

Make sure that the PDK kit is configured and powered up as explained in

Section 6.3

and

Section 6.4

. Then, press the Reset button on the MMB0 upper right-hand corner once.

Step 2.

Start ADCPro from the Windows Start menu.

Step 3.

Load the ADS794xEVM plug-in from the ADCPro EVM drop-down menu as

Figure 10

illustrates.

Figure 10. Loading ADS794xEVM Plug-in From ADCPro





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Step 4.

Wait for the driver prompt window to appear. When the plug-in is first loaded, the plug-in searches for the board. You will see a series of messages in the status area indicating this action; eventually, the driver prompt window will appear, as

Figure 11

shows.

Figure 11. USBStyx Driver Installation Prompt

NOTE:

If the USBStyx driver was previously installed on the PC, the status area should show the message Select Device without prompting for the driver. If this message appears, close

ADCpro and proceed to

Section 7 .

Step 5.

This driver should be present in the PC hard drive with the ADCPro files. Direct the PC to search the driver and install it by clicking Next -- > at every prompt. Be patient; it may take some time for the PC to find the driver.

NOTE:

During the driver installation, a small pop-up window may appear indicating that the firmware load has timed out. Ignore this pop-up. Continue with the USBStyx driver installation. Once driver installation has finished, click the Exit button in the small-pop up window.

Step 6.

Close ADCPro after the USBStyx driver has been installed.

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7 ADS794xEVM-PDK Kit Operation

ADS794xEVM-PDK Kit Operation

The evaluation software is based on ADCPro. This program operates using a variety of plug-ins. To use

ADCPro, load an EVM plug-in and a test plug-in. To load an EVM plug-in, select it from the EVM menu.

To load a test plug-in, select it from the Test menu. To unload a plug-in, select the Unload option from the corresponding menu.

The following sections describe how to use ADCPro and the ADS794xEVM plug-in to acquire data.

7.1

About the MMB0

The MMB0 provides the USB interface between the PC and the ADS794xEVM. The MMB0 is a modular

EVM system motherboard. It is designed around the TMS320VC5507 , a DSP with an onboard USB interface from Texas Instruments. The MMB0 also has 16 MB of SDRAM installed.

The MMB0 is not sold as a DSP development board, and it is not available separately. TI cannot offer support for the MMB0 except as part of an EVM kit. For schematics or other information about the MMB0, contact Texas Instruments.

7.2

Loading the ADS794xEVM-PDK Plug-in

The ADS794xEVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS794x.

You can adjust the ADS794xEVM settings when you are not acquiring data. During acquisition, all controls are disabled and settings may not be changed.

When you change a setting on the ADS794xEVM plug-in, the setting immediately updates on the board.

Settings on the ADS794xEVM correspond to settings described in the ADS794x product data sheet

(available for download at http://www.ti.com

); see the product data sheet for details.

To load the ADS794xEVM plug-in, follow these steps.

Step 1.

Make sure the PDK kit is configured and powered up as explained in

Section 6.3

and

Section 6.4

. Then, press the Reset button on the MMB0 (in the top right-hand corner) once to

clear the board memory.

Step 2.

Start ADCPro from the Windows Start menu.

Step 3.

Load the ADS794xEVM plug-in from the ADCPro drop-down EVM menu; see

Figure 10 . Note

that only one EVM plug-in can be loaded at a time. If a different plug-in is selected, the previous plug-in is unloaded.

Step 4.

When the plug-in is loaded, the plug-in searches for the board. A series of messages in the status area will indicate this action, eventually showing Select Device...

The plug-in is now loaded and ready to work with the ADS794xEVM.





17


www.ti.com

7.3

Using the ADS794xEVM Plug-in

The ADS794xEVM plug-in allows the user to evaluate the ADS794x ADC.

Figure 12

shows the device configuration tab of the ADS794xEVM Plug-in. Use this tab of the ADCPro software to configure the

ADS794x.

Figure 12. ADS794xEVM Plug-in: Device Configuration Tab

The device configuration tab contains the following controls.

(1) Device Selection: This control is a user input that must be set by the user, to identify whether the

ADS7945 or ADS7946 is installed on the board.

(2) Channel Select: This user input selects the channel to be sampled.

(3) Data Rate: This control shows the data rate or sampling frequency used by the ADC to acquire data.

(4) Power Down: This option controls the power-down mode of the ADC.

(5) Device Interface Information: This option shows the SPI parameters that are in use while sampling

data. These parameters should appear after a device is selected.

(6) About: This control shows the plug-in version, MMB0 firmware version, ADS794xEVM assembly date,

and ADS794xEVM board revision information. This information should appear after a device is selected.

(7) Collection Bar: This feature shows the percentage of data collected during an acquisition session.

18





www.ti.com


7.4

Loading the Test Plug-in

Once the ADS794xEVM plug-in is configured in ADCPro, one of the four test plug-ins must be loaded in

ADCPro using the drop-down Test menu, as shown in

Figure 13

. Note that only one Test plug-in can be loaded at a time. If a different plug-in is selected, the previous plug-in is unloaded.

Figure 13. ADCPro Test Plug-ins

There are four different test options available for the ADS794xEVM:

•

Data monitor: This test acquires data and exports it in table format as hexadecimal data.

•

MultiFFT: This test allows the user to acquire data and create an FFT graph of power vs. frequency to

display data

•

MultiHistogram: This option acquires data and creates a histogram of code values.

•

MultiScope: This feature acquires data and displays it in a graph of voltage vs. time.

For further details regarding how to set up and use the various test plug-ins, refer to the ADCPro User

Guide .

7.5

Acquiring Data

Once the ADS794xEVM is configured for the desired test scenario, press the Acquire button to start the data collection process; the software collects the number of data points specified in the Test plug-in Block

Size control. While acquiring data, the ADS794xEVM plug-in disables all front panel controls, and the

collection process bar displays the completion progress.

7.6

Troubleshooting

If the ADS794xEVM plug-in cannot find the ADS794xEVM-PDK, press the RESET button on the MMB0 and try again.

If ADCPro stops responding while the ADS794xEVM-PDK is connected, shut down and restart the

ADCPro software. Also, try unplugging the USB cable from the PDK. Unload and reload the plug-in before reapplying power to the PDK.





19

Bill of Materials, Schematics, and Layout

8 Bill of Materials, Schematics, and Layout

www.ti.com

Schematics for the ADS794xEVM are appended to this user's guide. The bill of materials is provided in

Table 5

.

Section 8.2

shows the PCB layouts for the ADS794xEVM.

8.1

Bill of Materials

NOTE:

All components should be compliant with the European Union Restriction on Use of

Hazardous Substances (RoHS) Directive. Some part numbers may be either leaded or

RoHS. Verify that purchased components are RoHS-compliant. (For more information about

TI's position on RoHS compliance, see the http://www.ti.com

.)

Table 5. ADS794xEVM Bill of Materials

20

Item No.

1

2

7

8

9

10

11

12

13

14

15

5

6

3

4

16

17

18

19

20

21

1

1

1

2

2

1

1

3

1

6

2

2

2

2

8

2

1

3

2

2

1

ADS7945

1

Qty

ADS7946

1

4

2

4

2

4

0

4

2

8

0

1

3

2

0

1

2

1

1

3

1

6

0

2

0

2

1

1

1

2

Ref Des

N/A

Description

Printed Circuit Board

C1, C13, C17,

C24

C20, C23

C2, C4, C10,

C14

C3, C11

C5, C6, C29

C8

Capacitor, X7R Ceramic

16WV, 0603

± 10%,

Capacitor, X7R Ceramic ± 10%,

10WV, 0603


6.3WV, 1206


6.3WV, 0805


10WV, 0603

C9, C12, C16,

C26, C27, C28

C22, C25

C15, C19

C18, C21

Capacitor, C0G Ceramic

50WV, 0603

Capacitor, C0G Ceramic

50WV, 0603

±

±

5%,

0.1p,

P1A, P2A

P1B, P2B

P3A

P3B

J1, J2, J3

R14

R30

R15

R11

R5, R6

Header, 20-Pin SMT Plug, .100

"

Gold (2x10)

Header, 20-pin SMT Socket, .100

"

Gold (2x10)

Header, 10-Pin SMT Plug, .100

"

Gold (2x5)

Header, 10-pin SMT Socket, .100

"

Gold (2x5)

Header, Strip, 3-pin .100

" Gold

(1x3)

J5, J11

J4, J10

J6

R1, R2, R3, R4,

R8, R28, R31,

R42

R34, R37

Connector, SMA Jack Straight PCB

Header Strip, 2-pin .100

"

Gold (1x2)

Resistor, Thick Film Chip, 1%,

1/10W, 0603

Resistor, Metal Film Chip, 0.1%,

1/8W, 0805


1/8W, 0805


1/8W, 0805


1/10W, 0603


1/10W, 0603

Vendor

Texas

Instruments

Murata

TDK

Taiyo Yuden

Taiyo Yuden

Murata

Murata

TDK

Samtec

Samtec

Samtec

Samtec

Samtec

Amphenol

Emerson

Samtec

Panasonic

Panasonic

Panasonic

Panasonic

Panasonic

Panasonic



Part Number

6527650

GRM188R71C104KA01D

C1608X7R1A105K

JMK316B7226ML-T

JMK212B7106KG-T

GRM188R71A225KE15D

GRM1885C1H102JA01D

C1608C0G1H2R2B

TSM-110-01-L-DV-P

SSW-110-22-F-D-VS-K

TSM-105-01-L-DV-P

SSW-105-22-F-D-VS-K

TSW-103-07-L-S

132134

142-0701-201

TSW-102-07-L-S

ERJ-3EKF47R0V

ERA-6AEB302V

ERA-6AEB152V

ERA-6AEB102V

ERA-3AEB102V

ERJ-3EKF1002V



32

33

30

31

34

35 www.ti.com

Item No.

22

23

24

25

26

27

28

29


1

1

2

2

4

ADS7945

4

4

4

3

2

2

0

3

3

1

1

0

1

1

Table 5. ADS794xEVM Bill of Materials (continued)

Qty

ADS7946

4

4

1

1

2

0

4

1

1

0

3

0

2

2

3

3

1

0

1

Ref Des Description

R20, R21, R26, Resistor, Thick Film Chip, 1%,

R27 1/10W, 0603

R16, R17, R24,

R45

R18, R22, R23,

R39


1/10W, 0603

R32, R40, R46


1/10W, 0603

R35, R38

R9, R12

R25, R29

Resistor, Thick Film Chip, 1/10W,

0603

T1, T2, T4

T5, T6, T7

T8

Test point PC Mini .040

" D Red


" D Black


" D Yellow

U1

U2

U3

U4

IC ADC, 14-bit, 2.5 MSPS, Full-Diff,

QFN-16

IC ADC, 14-bit, 2.5 MSPS,

Pseudo-Diff, QFN-16

IC Prec Volt Ref, 4.096 V LN/LD

8-MSOP

IC Op Amp, GP, R-R 38 MHz

Single, 8-MSOP

IC EEPROM, 256kBit, 400 kHz,

8-TSSOP

IC D-Type, F-F w/CLR Preset SM8 U9

U5, U8

U6, U7

N/A

IC Op Amp, R-R Out, 200 MHz,

SOT-23

0.100 Shunt, Black

Vendor

Vishay/Dale

Panasonic

Vishay/Dale

Panasonic

Keystone

Keystone

Keystone

Texas

Instruments

Texas

Instruments

Texas

Instruments

Texas

Instruments

Microchip

Texas

Instruments

Texas

Instruments

3M

Part Number

CRCW06034R99FKEA

ERA-3AEB103V

CRCW06031R00FKEA

ERJ-3GEY0R00V

5000

5001

5004

ADS7945SRTE

ADS7946SRTE

REF5040IDGKT

OPA350EA/250

24LC256-I/ST

SN74LVC2G74DCTR

OPA836IDBVT

969102-0000-DA





21


8.2

Board Layouts

Figure 14

through

Figure 17

show the PCB layouts for the ADS794xEVM.

NOTE:

Board layouts are not to scale. These figures are intended to show how the board is laid out; they are not intended to be used for manufacturing ADS794xEVM PCBs.

www.ti.com

Figure 14. ADS794xEVM PCB: Top Layer

Figure 15. ADS794xEVM PCB: Ground Layer

22





www.ti.com


Figure 16. ADS794xEVM PCB: Power Layer

Figure 17. ADS794xEVM PCB: Bottom Layer





23

D

C

B

A

6

+5VA

C14

1u

2

3

U2

VIN VOUT

TEMP TRIM

REF5040

GND

REF5040IDGKT

4

6

5

C4

1u

EXT_REF

T4

J10

1

A0(+)

R19

NI

R46

1

C29

10u

J2

REF IN/EXT

R14

T8

UniPolar VCM_Ouput

UN_POL_VCM

3k

R15

1k

5

R30

J6

Unipolar

1.5k

C5

10u

R11 1k

J5

1

A1(-)

J11

1

A0(-)

R10

NI

11

13

15

1

3

5

7

9

17

19

P2

A0(+)

A0(-)

A1(+)

A1(-)

REF+

EXT_REF_IN

2

4

6

8

10

12

14

16

18

20

J4

1

A1(+)

R44

NI

R43

NI

6

4

C13 0.1u

+5VA

3

2

7

U3

OPA350EA/250

6

4

R12 0

C6

10u

3 2

CH_SEL

T3

+VD

CH_SEL

R3

47

6 7 8

U9

5

Q

3

Q

CLK

1

D

2

GND

4 SN74LVC2G74DCTR

R28 47

LTR

1

REVISION RECORD

ECO NO: APPROVED: DATE:

D

+5VA

C2 1u

A0(+)

A1(+)

A1(-)

C8 2.2u

C1 0.1u

A0(-)

R31

UN_POL_VCM

47

C16

1000p

R17 10k

+5VA

C17

0.1u

3

4

6

5

U5

R32

1

2

OPA836IDBVT

C15 2.2p

1 R20 4.99

R16 10k

R34

*

UN_POL_VCM

47

C22

*

1000p

+5VA

3

4

C23

*

0.1u

6

5

U7

*

R35

1

2

OPA836IDBVT

1

R23

*

10k

C21 2.2p

R22

*

10k

R26

R25

4.99

NI

R37

*

UN_POL_VCM

47

C25

*

1000p

+5VA

C20

*

0.1u

3

4

6

5

U6

*

R38

1

2

OPA836IDBVT

1

R39

*

10k

C18

R18

*

2.2p

10k

R27 4.99

R29 NI

R42

UN_POL_VCM

47

C26

1000p

R45 10k

5

+5VA

C24 0.1u

3

4

6

5

U8

1

2

OPA836IDBVT

R40

C19 2.2p

R24 10k

1

R21

4.99

4

C27

1000p

C28

1000p

U1

4

REFN

3

REFP

2

AVDD

1

GND

DVDD

16

5

AIN0P

SDO

15

6

AIN0N

SCLK

14

CS

13

7

AIN1N

PDEN

12

8

AIN1P

CH_SEL

11

THERMAL_PAD

17 9

NC NC

10

ADS7945/6

C11

22u

+5VA

+5VA

T1

C12

1000p

T7

AGND

T6

AGND

T5

AGND

3

+VD

R6 10k

/CS

C10

1u

/CS

SCLK

SDO

R1

R2

R4

47

/CS or FSX

J1

47

SCLK

47

FSX

SCLK

MOSI

MISO

9

11

13

1

3

5

7

15

17

19

GPIO5

P1

2

4

6

8

10

12

14

16

18

20

R5

10k

+5VA

+3.3VD

7

9

1

3

5

P3

2

4

6

8

10

+5VD

R9 0

DESIGNED BY:

Rafael Ordonez

DRAWN BY:

Rafael Ordonez

DOCUMENT CONTROL NO.

6527650

SHEET 1 OF 1

TITLE:

SIZE:

C

FILE: ADS7945-6EVM_A.sch

2

J3

VD 5.0/3.3

+5VD

C9

1000p

+3.3VD

+VD

C3

22u

+VD

T2

Texas Instruments, Inc.

PRECISION ANALOG PRODUCTS

HIGH-PERFORMANCE ANALOG DIVISION

SEMICONDUCTOR GROUP

5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA

DATED:

R8

47

ADS7945-6EVM

May-17-2011

NI

+3.3VD

R7

1

2

3

7

A0

A1

A2

WP

U4

VCC

SDA

SCL

GND

24LC256-I/ST

8

5

6

4

1

REV:

A

C

B

A

Evaluation Board/Kit Important Notice

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION

PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

Should this evaluation board/kit not meet the specifications indicated in the User ’ s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY

SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING

ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user ’ s responsibility to take any and all appropriate precautions with regard to electrostatic discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER

FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or infringement of

patents or services described herein.

Please read the User ’ s Guide and, specifically, the Warnings and Restrictions notice in the User ’ s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI ’ s environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh .

No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used.

FCC Warning

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION

PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference.

EVM Warnings and Restrictions

It is important to operate this EVM within the input voltage range of – 5 V to +5 V and the output voltage range of 0 V to +5 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the

EVM. Please consult the EVM User ' s Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than +27 ° C. The EVM is designed to operate properly with certain components above +60 ° C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User ' s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265


EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS

Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.

Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO

BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF

MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH

ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL

DAMAGES.

Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety programs, please visit www.ti.com/esh or contact TI.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein.

REGULATORY COMPLIANCE INFORMATION

As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal

Communications Commission (FCC) and Industry Canada (IC) rules.

For EVMs

not

subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT,

DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES-003 rules, which are designed to provide reasonable protection against radio frequency interference. Operation of the equipment may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference.

General Statement for EVMs including a radio

User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization.

For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant

Caution

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

FCC Interference Statement for Class A EVM devices

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

FCC Interference Statement for Class B EVM devices

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

For EVMs annotated as IC – INDUSTRY CANADA Compliant

This Class A or B digital apparatus complies with Canadian ICES-003.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

Concerning EVMs including radio transmitters

This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

Concerning EVMs including detachable antennas

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.

This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.

Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.

Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de l'utilisateur pour actionner l'équipement.

Concernant les EVMs avec appareils radio

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

Concernant les EVMs avec antennes détachables

Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente

(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.

Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

SPACER

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SPACER

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【】

This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan

If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:

1.

Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and

Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of

Japan,

2.

Use this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this product, or

3.

Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan.

Texas Instruments Japan Limited

(address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan

http://www.tij.co.jp

【ご使用にあたっての注】

本開発キットは技術基準適合証明を受けておりません。

本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。

1.

電波法施行規則第 6 条第 1 項第 1 号に基づく平成 18 年 3 月 28 日総務省告示第 173 号で定められた電波暗室等の試験設備でご使用いただく。

2.

実験局の免許を取得後ご使用いただく。

3.

技術基準適合証明を取得後ご使用いただく。

なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。

　　　上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。

日本テキサス・インスツルメンツ株式会社

東京都新宿区西新宿６丁目２４番１号

西新宿三井ビル http://www.tij.co.jp

EVALUATION BOARD/KIT/MODULE (EVM)

WARNINGS, RESTRICTIONS AND DISCLAIMERS

For Feasibility Evaluation Only, in Laboratory/Development Environments.

Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use. It is intended solely for use for preliminary feasibility evaluation in laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end product.

Your Sole Responsibility and Risk. You acknowledge, represent and agree that:

1.

You have unique knowledge concerning Federal, State and local regulatory requirements (including but not limited to Food and Drug

Administration regulations, if applicable) which relate to your products and which relate to your use (and/or that of your employees, affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes.

2.

You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable regulatory requirements, and also to assure the safety of any activities to be conducted by you and/or your employees, affiliates, contractors or designees, using the EVM. Further, you are responsible to assure that any interfaces (electronic and/or mechanical) between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard.

3.

You will employ reasonable safeguards to ensure that your use of the EVM will not result in any property damage, injury or death, even if the EVM should fail to perform as described or expected.

4.

You will take care of proper disposal and recycling of the EVM’s electronic components and packing materials.

Certain Instructions

. It is important to operate this EVM within TI’s recommended specifications and environmental considerations per the user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and environmental ranges) may cause property damage, personal injury or death. If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the specified output range may result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or interface electronics. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than 60°C as long as the input and output are maintained at a normal ambient operating temperature. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors which can be identified using the

EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during normal operation, please be aware that these devices may be very warm to the touch. As with all electronic evaluation tools, only qualified personnel knowledgeable in electronic measurement and diagnostics normally found in development environments should use these EVMs.

Agreement to Defend, Indemnify and Hold Harmless.

You agree to defend, indemnify and hold TI, its licensors and their representatives harmless from and against any and all claims, damages, losses, expenses, costs and liabilities (collectively, "Claims") arising out of or in connection with any use of the EVM that is not in accordance with the terms of the agreement. This obligation shall apply whether Claims arise under law of tort or contract or any other legal theory, and even if the EVM fails to perform as described or expected.

Safety-Critical or Life-Critical Applications.

If you intend to evaluate the components for possible use in safety critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, such as devices which are classified as FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate

Assurance and Indemnity Agreement.



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ADS794xEVM and ADS794xEVM-PDK User s Guide '

User

s Guide

ADS794xEVM-PDK

Related Documentation

1 EVM Overview

1.1

Features

ADS794xEVM Features:

ADS794xEVM-PDK Features:

1.2

Introduction

2 Analog Interface

Table 1. P2: Analog Interface Pinout (Samtec 10 x 2)

Table 2. SMA Analog Inputs

2.1

ADS794xEVM Analog Inputs with ADS7945 Installed

Figure 1. ADS794xEVM and ADS7945 Analog Inputs

2.2

ADS794xEVM Analog Inputs with ADS7946 Installed

Figure 2. ADS794xEVM and ADS7946 Analog Inputs

2.3

External Reference Input

3 Digital Interface

Table 3. P1: Serial Interface Header

3.1

Serial Interface (SPI)

3.2

ADS794x Channel Select as SDI (MISO)

3.3

I

C Bus for Onboard EEPROM

4 Power Supplies

Table 4. P3 Configuration: Power-Supply Interface Header

4.1

Analog Power Options

4.2

Digital Power Options

4.3

Reference Voltages

CAUTION

5 EVM Operation

5.1

Analog Input

Mode 1: DC-Coupled Unipolar Inputs (J6 Closed)

Mode 2: DC-Coupled Bipolar Inputs (J6 Open)

Mode 3: AC-Coupled Inputs (J6 Closed)

5.2

Digital Control

5.3

Default Jumper Settings

6

Figure 3. ADS794xEVM Default Jumper Locations

ADS794xEVM-PDK: Software Installation

6.1

Installing the ADCPro Software

CAUTION

6.2

Installing ADS794xEVM-PDK Plug-In Software

version #

.exe (

Figure 4. ADS794xEVM-PDK Plug-In Installer

Figure 5. Completed ADS794xEVM-PDK Installer

6.3

Configuring the ADS794xEVM-PDK Hardware

Figure 6. MMB0 Jumper Locations

Figure 7. Connecting ADS794xEVM to MMB0

CAUTION

CAUTION

6.4

Powering Up the ADS794xEVM-PDK

Figure 8. Powering Up ADS794xEVM-PDK

6.5

First-Time Connection: ADS794xEVM-PDK to PC, Completing Driver Installation

6.5.1

NI-VISA USB Device Driver Installation

Figure 9. NI-VISA Driver Installation Prompt

6.5.2

USBStyx Driver Installation

Figure 10. Loading ADS794xEVM Plug-in From ADCPro