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Texas Instruments ADS527xEVM (Rev. A) User guides
User's Guide
SBAU093A – March 2004 – Revised October 2005
ADS527xEVM Evaluation Module
The ADS527xEVM is designed for ease of use in evaluating the performance of the
ADS527x of 10- and 12-bit analog-to-digital converters (ADCs) with low-voltage
differential signal (LVDS) outputs.
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Contents
Description ...........................................................................................
Power Supplies .....................................................................................
Signals ...............................................................................................
Operation ............................................................................................
Bill of Materials ......................................................................................
Schematic and PCB ................................................................................
1
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2
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6
8
List of Figures
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2
3
4
5
6
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9
10
Evaluation Board Overview ....................................................................... 3
Initial Startup Screen ............................................................................... 4
COM Port Selection Prompt ....................................................................... 4
COM Port Drop-Down Selection List ............................................................. 4
Register Access Program Screen ................................................................ 5
Register Access Program Screen – Custom Pattern Option ................................. 6
ADS527xEVM PCB – Top Layer ................................................................. 8
ADS527xEVM PCB – Ground Layer ............................................................. 9
ADS527xEVM PCB – Power Layer ............................................................. 10
ADS527xEVM PCB – Bottom Layer ............................................................ 11
List of Tables
1
1
Component List
....................................................................................
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Description
The ADS527xEVM is designed to provide ease of use in evaluating the performance of the ADS527x
family of 10- and 12-bit ADCs with LVDS outputs. When combined with the ADSDeSer-50EVM, a
complete evaluation of the ADS527x family can be performed. The ADS527xEVM has the following
features:
• Easy testing of the ADS527x family of 10 and 12-bit data converters
• Single-ended, transformer-coupled inputs.
• PC interface to control internal registers.
2
Power Supplies
The ADS527x EVM requires four supplies:
• AVDD – 3.3V DUT analog supply
• DVDD – 3.3V Digital supply for the microcontroller and RS232 level shifter
• LVDD – 1.8V to 3.3V LVDS output driver supply
SBAU093A – March 2004 – Revised October 2005
ADS527xEVM Evaluation Module
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www.ti.com
Signals
•
AW – 3.3V Clock driver supply
All of the supplies can be connected to one 3.3V supply for ease of connectivity.
3
Signals
3.1
External Reference
By default, the ADS527x EVM defaults to an internally generated referenc. However, by asserting SW3,
the ADS527x will use the REFT and REFB supplied on P1 as its references.
3.2
Inputs Signals
The input signals are applied to SMA connectors J1, J3, J5, J7, J9, J11, J13 AND J15. The input signals
are transformer-coupled to the inputs of the ADC. There are no coupling capacitors, only resistors in
series with the converters inputs to the transformers.
3.3
Output Signals
The LVDS outputs from the ADC are sent to P6. P6 is used to connect the ADS527xEVM to the
ADSDeSer-50EVM to provide a means for deserializing the data for external processing.
3.4
Clock Signal
Enter a clean, low jitter, 3Vpp clock on J17. The maximum clock frequency should be set with the aid of
the device data sheet. Either a sinusoidal or square-wave clock input can be expected.
4
Operation
When power is applied to the board, the EVM performs an initialization sequence that sets the initial
operation of the ADS527x. The Ref LED lights up to signify that the Int/Ext reference is set to internal. The
RST LED is illuminated while a reset pulse is provided to the ADS527x to reset the device for proper
operation. The EVM is now operational. If it is connected to the ADSDESer-50EVM and the reset
pushbutton is pressed on the deserializer board, parallel data should be available on each channel output,
and a clock should be present on the clock output.
4.1
Pushbuttons and Indicator LEDs
The ADS527xEVM has three pushbuttons and four indicator LEDs, as shown in Figure 1. The
pushbuttons and their corresponding LEDs are defined as follows:
• SW1 – RST – ADS527x device reset (resets only the ADS527x device).
• SW2 – PD– ADS527x device power-down (LED on signifies that only the ADS527x device is in
complete power-down).
• SW3 – Ref– Internal/External Reference Selection (LED on signifies Internal reference).
When illuminated, the fourth LED (SDI) signifies that data has been received from the PC through the
serial link.
2
ADS527xEVM Evaluation Module
SBAU093A – March 2004 – Revised October 2005
www.ti.com
Pow er Connectors
Operation
Int/Ext Reference Select Pushbutton
SW 3
Int/Ext Reference LED (On = Internal)
Green LED
Serial Interface (On = Data)
Green LED
Power−Down LED (On = Powered Down)
Green LED
Reset LED
Green LED
Power−Down Pushbutton
SW 2
Reset Pushbutton
SW 1
C lo ck
D river
ADS527x
C lo ck
SM A
M icro
O utp ut Connector
In pu t C ircuitry
In pu t C ircuitry
R S2 32 −T T L
DB9
Figure 1. Evaluation Board Overview
4.2
Serial Data In
The Serial Data In (DB-9) connector is used to connect the EVM to a PC for accessing the internal
registers of the ADS527x device. This allows extended flexibility of the device beyond the simple power-up
mode.
4.3
Accessing the Internal Registers
The ADS527x family has several internal registers that offer flexibility to the end user. In order to facilitate
using these registers, the evaluation program is used. With the combination of a serial port on a PC, EVM
software, a serial link cable (provided), and the ADS527xEVM, the user has the ability to access the
internal registers on the ADS527x family of data converters.
4.4
Installing the Software
Software installation is straightforward. Insert the included CD and double click on the Setup.exe file. This
will install the program and all necessary files to the PC.
Note:
The installation files are also available for download from the TI web site at www.ti.com.
Once the installation process is complete go to the START > Programs > ADS527xEVM_Software >
ADS527xEVM_Software icon to start the program.
SBAU093A – March 2004 – Revised October 2005
ADS527xEVM Evaluation Module
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www.ti.com
Operation
4.5
Using the Software
After clicking on the ADS527xEVM_Software icon, an initial startup screen will be displayed, as shown in
Figure 2. The COM Port Selection prompt, as shown in Figure 3, will appear in front of Figure 2.
Figure 2. Initial Startup Screen
Figure 3. COM Port Selection Prompt
Click OK and then select the proper COM port from the drop-down list, as shown in Figure 4. The program
lists all available COM ports on your system to choose from. Once a COM port is selected, the main
program window will open. (This example only shows two COM ports listed. Results will vary based on
your actual system configuration.)
Figure 4. COM Port Drop-Down Selection List
4
ADS527xEVM Evaluation Module
SBAU093A – March 2004 – Revised October 2005
www.ti.com
Operation
The main program window (see Figure 5) allows the user to access the registers of the ADS527x family.
With this program, it is easy to change operating characteristics, send out test patterns, or power down
any of the eight channels of the ADS527x converter. The software also contains the ability to reset the
ADS remotely from the PC in addition to the pushbutton on the EVM board itself.
Figure 5. Register Access Program Screen
Once again, program operation is straightforward. Make your selection and press the Download button.
The proper codes are then sent from the PC to the ADS527xEVM board. A software reset is provided to
reset all choices to their default values. To exit the program, click the the Exit command button or go to
the File menu and select Exit.
4.6
Custom Pattern Generation
When using the custom pattern option, as shown in Figure 6, all of the values are entered in a binary
format (e.g., 101011001111).
Note:
Even when using a 10-bit device (ADS5277), both the internally-generated patterns and
the custom pattern are 12 bits in length.
SBAU093A – March 2004 – Revised October 2005
ADS527xEVM Evaluation Module
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www.ti.com
Bill of Materials
Figure 6. Register Access Program Screen – Custom Pattern Option
4.7
LSB/MSB First Mode
The default mode of data out of the ADS527x device is LSB first. This mode can be changed by selecting
the MSB First option in the software, as shown in Figure 5 and Figure 6. This option increases the
flexibility of the device.
Note:
Changing to MSB First also reverses the internally-generated test patterns and the
custom pattern. This will show up on the Register Access screen as blue text.
5
Bill of Materials
6
ADS527xEVM Evaluation Module
SBAU093A – March 2004 – Revised October 2005
www.ti.com
Bill of Materials
Table 1. Component List
MFG PART #
INSTALLED
REF DES
DESCRIPTION
MFG
ADS527xPFC
U1
IC, 10/12-BIT, 40-70MSPS, LVDS,
8-CHANNEL A.D.C.
CRCW040210R0F
R1, R2
RES, 10 Ω, 0.1W, 1%, 0402 CHIP,
THICK FILM
VISHAY/DALE
CRCW040249R9F
R6, R8, R9, R13,
R14, R18,R19, R23,
R24,R28, R29,
R33,R34, R38,
R39,R43, R44,
R54,R55, R56–R69,
R83
RES, 49.9 Ω, 0.1W, 1%, 0402 CHIP,
THICK FILM
VISHAY/DALE
CRCW0402000RF
R4, R7, R10–R12,
RES, 0.0 Ω, 0.1W, 1%, 0402 CHIP,
R15–R17, R20–R22M THICK FILM
R25–RR27,
R30–R32, R35–R37,
R40–R42, R45, R46
VISHAY/DALE
CRCW0402332RF
R49–R52
RES, 332 Ω, 0.1W, 1%, 0402 CHIP,
THICK FILM
VISHAY/DALE
CRCW1206000
R70–R72
RES, 0.0 Ω, 0.125W, 0%,
CHIP-JUMPER
DALE
CRCW04024751F
R47, R48, R53
RES, 4.75 kΩ, 0.1W, 1%, 0402 CHIP,
THICK FILM
VISHAY/DALE
CRCW04025622F
R3
RES, 56.2 kΩ, 0.1W, 1%, 0402 CHIP,
THICK FILM
VISHAY/DALE
ERJ-2RKF4990X
R80–R82
RES, 499 Ω, 0.1W, 1%, 0402, CHIP
Panasonic
CY8C27243-24PVXI
U4
IC, MICROCONTROLLER, 8-bit PSoC
DEKL-9SAT-F
P5
CONN, DB9, RTANG RECPT 0.318 W/
SCRW. LCKS.
CINCH
ECJ0EB1A104K
C2, C3, C5, C14,
C18, C21, C23,
C24–C26, C30, C31,
C33, C35, C37, C39,
C41, C43–C45,
C47–C49, C51–C53,
C55–C57, C59–C61,
C63–C65, C67–C69,
C71–C78
CAP, 0.1 µF, 10VDC, 10%, CERAMIC
MULTILAYER CHIP
Panasonic
ECJ0EB1C103K
C16, C17, C80
CAP, 0.01 µF, 16VDC, 10%, CERAMIC
MULTILAYER CHIP
Panasonic
ECJ0EB1H102K
C19, C20, C22,
C27–C29, C32, C34,
C36, C38, C40
CAP, 0.001 µF, 50V DC, 10%
CERAMIC MULTILAYER 0402
Panasonic
ECJ0EC1H100K
C42, C46, C50, C54,
C58, C62, C66, C70
CAP, 10 pF, 50V DC, 10% CERAMIC
MULTILAYER 0402
Panasonic
ECJ1VB1C104K
C6, C9, C10, C12
CAP, 0.1 µF, 16VDC, 10%, CERAMIC
MULTILAYER CHIP
Panasonic
EVQPJB04K
SW1–SW3
SWITCH, SPST, PCB MOUNT
MAX3221CDB
U3
No PDB description available
MC100EPT21DT
U2
IC, 3.3V TRANSLATOR,
DIFFERENTIAL LVPECL to LVTTL
PTR AK550 3
P1–P3
TERM. BLK, 3 POS POWER
CONNECTOR
QTH-040-01-F-D-DP-A
P6
CONN, 80 PIN SMT, HI SPEED
TERMINAL STRIP
SML-LX1206-GC-TR
CR1–CR4
LED, SMT 1206, GREEN
TTWB-4-B
T1–T8
XFMR, RF, 0.1–1500 MHz
COILCRAFT
T491B225K016AS
C1, C4
CAP, 2.2 µF, 16V, 10%, TANTALUM
CHIP-MOLDED
KEMET
T491B475K016AS
C7, C8, C11, C13
CAP, 4.7 µF, 16V, 10%, TANTALUM
CHIP-MOLDED
KEMET
SBAU093A – March 2004 – Revised October 2005
DO NOT
INSTALL
COMMENTS
See Note 1
(NOT IN
SOURCE)
R5, R7, R11, R12,
R16, R17, R21,
R22, R26, R27,
R31, R32, R36,
R37, R41, R42, R46
See Note 2
(NOT IN
SOURCE)
On Semiconductor
SAMTEC
ADS527xEVM Evaluation Module
7
www.ti.com
Schematic and PCB
Table 1. Component List (continued)
MFG PART #
6
INSTALLED
REF DES
DESCRIPTION
142-0701-201
J1, J3, J5, J7, J9,
J11, J13, 15, J17
CONN, SMA JACK 0.2CC LO-COST
102203-3
P4
CONN, HEADER, 6 POSITION, RIGHT
ANGLE, SINGLE ROW
SRS4-8-01
1/2" Stand offs
MFG
DO NOT
INSTALL
COMMENTS
J2, J4, J6, J8, J10,
J12, J14, J16
Richo Inc.
Schematic and PCB
Figure 7. ADS527xEVM PCB – Top Layer
8
ADS527xEVM Evaluation Module
SBAU093A – March 2004 – Revised October 2005
www.ti.com
Schematic and PCB
Figure 8. ADS527xEVM PCB – Ground Layer
SBAU093A – March 2004 – Revised October 2005
ADS527xEVM Evaluation Module
9
www.ti.com
Schematic and PCB
Figure 9. ADS527xEVM PCB – Power Layer
10
ADS527xEVM Evaluation Module
SBAU093A – March 2004 – Revised October 2005
www.ti.com
Schematic and PCB
Figure 10. ADS527xEVM PCB – Bottom Layer
SBAU093A – March 2004 – Revised October 2005
ADS527xEVM Evaluation Module
11
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