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Texas Instruments ADS8345EVM User guides
ADS8345EVM
User’s Guide
August 2002
Data Acquisition Products
SBAU082
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
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is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright  2002, Texas Instruments Incorporated
EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the 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. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). 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 EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
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.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright  2002, Texas Instruments Incorporated
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of +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
60°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
Copyright  2002, Texas Instruments Incorporated
Related Documentation From Texas Instruments
Preface
Read This First
About This Manual
This users guide describes the characteristics, operation, and use of the
ADS8345EVM 16-bit serial analog to digital converter evaluation board. A
complete circuit description as well as schematic diagram and bill of materials
is included.
How to Use This Manual
This document contains the following chapters:
- Chapter 1—Inroduction and EVM Description
- Chapter 2—EVM BIll of Materials and Schematic
Related Documentation From Texas Instruments
ADS8345
OPA627
REF1004C-2.5
(literature number SBAS177A)
(literature number PDS998H)
(literature number PDS-1172)
FCC Warning
This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequency energy and has not been tested
for compliance with the limits of computing devices pursuant to subpart J of
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.
iii
iv
Contents
Contents
1
Introduction and EVM Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Analog Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3
Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5
Reference Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6
EVM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
1-2
1-2
1-3
1-3
1-4
1-4
2
EVM Bill of Materials and Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1
EVM Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2
EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Tables
1-1
1-2
1-3
1-4
1-5
2-1
Connector P1 Pinout—Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Channel 0 Input Jumper Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interface Converter J2 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Jumper Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Source Jumper Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADS8345EVM Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2
1-3
1-3
1-3
1-4
2-2
v
vi
Chapter 1
Introduction and EVM Description
The ADS8345EVM is an 8-channel, 16-bit analog-to-digital converter board
based on the ADS8345 ADC. Typical power dissipation is 8 mW at a 100 kHz
throughput rate and a 5-V supply. The device uses a synchronous serial
interface, which is buffered on the EVM.
The EVM also incorporates a stable voltage reference and operational
amplifier, configured as a buffer to ensure a low-noise voltage to the ADC.
Topic
Page
1.1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.2
Analog Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.3
Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.4
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.5
Reference Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.6
EVM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Introduction and EVM Description
1-1
Features
1.1 Features
- Full-featured evaluation board for the ADS8345 100 kHz, 16-bit, 8-chan-
nel analog-to-digital converter
- Onboard reference
- Signal conditioning available
1.2 Analog Interface
For maximum flexibility, the ADS8345EVM is designed for easy interfacing to
multiple analog sources. An amplifier is present in a noninverting
configuration, for channel 0 only.
Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P
provide a convenient 10-pin dual-row header/socket combination at P1. This
header/socket provides access to the analog input pins of the ADS8345.
Consult Samtec at www.samtec.com or 1-800-SAMTEC-9 for a variety of
mating connector options.
Table 1-1. Connector P1 Pinout—Analog Input
Pin Number
Signal
Description
P1.2
CH0
Channel 0 input, can be direct from connector or through op-amp
P1.4
CH1
Channel 1 input, direct from P1 connector
P1.6
CH2
Channel 2 input, direct from P1 connector
P1.8
CH3
Channel 3 input, direct from P1 connector
P1.10
CH4
Channel 4 input, direct from P1 connector
P1.12
CH5
Channel 5 input, direct from P1 connector
P1.14
CH6
Channel 6 input, direct from P1 connector
P1.16
CH7
Channel 7 input, direct from P1 connector
P1.18
Reserved
P1.20
REF+
External reference input
The appropriate jumpers are configured to enable the input for channel 0 to
be derived from the onboard dual-supply op-amp.
1-2
Digital Interface
Table 1-2. Channel 0 Input Jumper Configuration
Factory Set Condition
Reference
Designator
1-2
Description
2-3
W1
Enables reference offset for single-supply amplifiers
Not installed
N/A
W3
Input Source for channel 0
Onboard amplifier, U1
P1.2
1.3 Digital Interface
The ADS8345EVM is designed for easy interfacing to multiple platforms.
Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P
provide a convenient ten-pin dual-row header/socket combination at P2. This
header/socket provides access to the digital control and serial data pins of the
ADS8345. Consult Samtec at www.samtec.com or 1-800-SAMTEC-9 for a
variety of mating connector options.
Table 1-3. Interface Converter J2 Pinout
Pin Number
Signal
Description
J2.1
CS
Chip select—Active low signal, enables data transfer and device configuration
J2.3
SCLK
J2.5
Reserved
J2.7
Reserved
J2.9
Reserved
J2.11
SDI
Serial data in
J2.13
SDO
Serial data out
J2.15
BUSY
Indicates internal state of ADC
J2.17
Reserved
J2.19
Reserved
Serial clock
1.4 Power Supplies
The ADS8345EVM board can accept three power supplies.
-
A dual ±12-V dc supply for the dual-supply op-amps, and also to
power the voltage reference.
-
A single 2.7-V to 5-V dc supply for the ADC and the digital interface.
Table 1-4. Power Supply Jumper Configuration
Factory Set Condition
Reference Designator
Description
1-2
2-3
W2
Negative supply for amplifiers
-12 V, via J3.4
AGND
W4
Positive supply for amplifiers
+12 V, via J3.2
+VCC, via J3.1
Introduction and EVM Description
1-3
Reference Voltage
1.5 Reference Voltage
The ADS8345EVM can be configured to use its onboard reference, or external
reference source via W5.
Table 1-5. Reference Source Jumper Configuration
Factory Set Condition
Reference Designator
W5
Description
1-2
2-3
Reference is derived from onboard source
Installed
Not installed
Reference is derived from P1.20
Not installed
Installed
1.6 EVM Operation
Apply the appropriate current-limited (500 mA max) dc sources to J3 prior to
connecting the analog input signals and digital control signals. The digital
control signals can be applied directly to P2 or the ADS8345EVM can be
connected to a Texas Instruments DSP interface board.
A number of interface options are available for this style of EVM. Consult the
product folder for a complete list of TI DSP interface cards and optional analog
interface modules. If the interface options listed are not suitable, contact the
PIC for the latest information.
1-4
Chapter 2
EVM Bill of Materials and Schematic
This chapter contains a complete bill of materials and schematic for the
ADS8345EVM. Contact the Product Information Center or e-mail
dataconvapps@list.ti.com if you have questions regarding this EVM.
Topic
Page
2.1
EVM Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2
EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
EVM Bill of Materials and Schematic
2-1
EVM Bill of Materials
2.1 EVM Bill of Materials
Table 2-1. ADS8345EVM Bill of Materials
Ref Des
Description
Vendor
Part number
R10, R12, R18
1/16 W 5% 0 Ω chip resistor
Panasonic
ERJ-3GEY0R00V
R2, R3, R4,
1/16W 5% 33 Ω chip resistor
Panasonic
ERJ-3GEYJ330V
R13 R14 R15 R16
1/16W 1% 100 Ω chip resistor
Panasonic
ERJ-3GEYJ101V
R17
1/16W 1% 1K Ω chip resistor
Panasonic
ERJ-3GEYJ102V
C24
10 pF, 50 V ceramic chip capacitor,
Panasonic
ECJ-2VC1H100D
0.1 µF, 25 V ceramic chip capacitor, 80%,
-20%, Y5V
Panasonic
ECJ-1VF1E104Z
C29
0.1 µF, 5 0V ceramic chip capacitor, ±10%,
X7R
Panasonic
ECJ-2YB1H104K
C1, C9, C14, C16
10 µF, 16 V VS series electrolytic
Panasonic
ECE-V1CA100SR
C12, C15, C18
10 µF, low-profile tantalum capacitor
Panasonic
ECS-T1CX106R
47 nF, 16 V ceramic capacitor, 80%, -20%
Murata
GRM39Y5V473Z016AD
FB1, FB2, FB3
Ferrite bead inductor
Fair-Rite
2744044447
U1, U5
Precision single amplifier
Texas Instruments
OPA627AU
U2
ADS8345
Texas Instruments
ADS8345EB
U3
REF1004 2.5 V voltage regulator
Texas Instruments
REF1004C-2.5
U6, U7
Single IC buffer driver with open drain o/p
Texas Instruments
SN74LVC1G07DBVR
N/A
ADS8345 EVM PWB
Texas Instruments
6443151
AGND1, DGND1
Miniature test point terminal
Keystone Electronics
5000
P1, P2
20 Pin SMT plug
Samtec
SSW-110-22-F-D-VS-K
J1, J2
20 pin SMT socket
Samtec
TSM-110-01-T-DV-P
W1
2 Position jumper, 0 .1 inch spacing
Samtec
TSW-102-07-L-S
W2, W3, W4, W5, W6
3 Position jumper, 0 .1 inch spacing
Samtec
TSW-103-07-L-S
J3
4-terminal screw connector
Lumberg
KRMZ4
R5, R6, R7,
R8, R9, R11
±0.5 pF, NPO
C10, C13, C17,
C19, C22, C23,
C26, C28, C30
C21, C25, C27
C2, C3, C4, C5,
C6, C7, C8, C11
2-2
EVM Schematic
2.2 EVM Schematic
A complete schematic of the ADS8345EVM is furnished on the following page.
EVM Bill of Materials and Schematic
2-3
1
2
3
4
6
5
Revision History
W1
C20
R1
Not Installed
+Vcc_D
+Vcc_D
+Vcc_D
REV
ECN Number
Approved
Not installed
R12
0R
AGND
R15
R16
R17
100R
100R
1K
+
C22
SHDN*
BUSY
DOUT
Amplifier +Supply
D
W6
D
C21
10uF
0.1uF
DGND
7
+Vcc_A
2
U1
-In
P1
5
6
CH2
7
8
9
10
11
12
13
14
15
17
19
+In
W3
C13
R9
33R
Amplifier -Supply
0.1uF
C15
+
10uF
C11
CH3
47nF
C19
10uF
0.1uF
CH0
AGND
CH5
12
C18
20
CH4
Note:Plug is installed topside (P)
Socket is installed bottomside (J)
AGND
U2
16
CH1
R8
CH1_LPF 2
33R
18
CH2
C8
REFP
20
R7
CH2_LPF 3
33R
C7
47nF
Note:Plug is installed topside (P)
Socket is installed bottomside (J)
CH5
R4
CH3
R6
CH3_LPF 4
33R
CH5_LPF
33R
R5
CH4
C5
47nF
CH6
C4
R3
47nF
CH6_LPF
33R
C3
47nF
47nF
CH4_LPF 5
33R
C6
CH7
R2
CH5_LPF 6
CH6_LPF 7
CH7_LPF 8
CH7_LPF
CH0
ADS8345
+Vcc
CH0_LPF 1
CH7
+Vcc
CH6
47nF
AGND
B_CH0
4
4
CH1
3
C
2
+
1
6
Output
3
CH0
P2
CH1
CS*
CH2
DCLK
CH3
Din
CH4
DOUT
CH5
BUSY
CH6
SHDN*
18
CS*
19
BCLK
R11
CLK
15
+Vcc_D
U7
16
SN74LVC1G07
5
2
SHDN*
4
A
CH7
3
C2
+Vcc_D
47nF
GND
GND
COM
B
8
9
10
12
14
BUSY
15
16
17
18
19
20
Y
14
13
9
10uF
7
U6
DGND
SN74LVC1G07
DGND
R19
VREF+
6
C
3
0R
+Vcc_D
5
13
4
R18
+ C25
4
11
5
2
A
W5
3
DOUT
DGND
VREF
REFP
FB4
DIN
Y
33R
11
2
33R
17
10
1
C29
AGND1
R14
Not Installed
0.1uF
B
C24
+
C30
C16
AGND
0R
10pF
10uF
0.1uF
DGND1
R10
100R
Amplifier +Supply
AGND
AGND
C23
0.1uF
FB3
+Vcc_A
+
DGND
C12
10uF
DGND
+
7
U5
C26
C14
10uF
J3
W4
0.1uF
1
+Vcc_A
3
+Vs_A
+Vs
C10
+
C9
R13
6
Output
VREF+
100R
+In
4
R20
3
OPA627
-In
+Vcc
FB2
2
2
Amplifier +Supply
51K
10uF
AGND
0.1uF
Amplifier -Supply
U3
-Vs
FB1
1
-Vs_A
2
A
C17
C1
+
0.1uF
W2
3
Amplifier -Supply
10uF
4
NC Cathode
NC
NC
C28
7
0.1uF
C27
AGND
12500 TI Boulevard. Dallas, Texas 75243
Title:
AGND
Engineer:
Joe Purvis
Drawn By:
Joe Purvis
FILE:
1
2
3
A
5
NC
REF1004C-2.5
AGND
10uF
6
NC Cathode
Anode
8
+
4
4
5
ADS8345 Rev C
ADS8345 Evaluation Module
DOCUMENTCONTROL #
6434956
DATE:
29-Jul-2002
SIZE:
6
SHEET:
1
REV:
C
OF:
1
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