Texas Instruments ADS1202 User manual

ADS1202 Modular EVM
August 2003 Data Acquisition - Digital/Analog Converters)
User’s Guide
SLAU111

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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
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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
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discharge.
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TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
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TI assumesno 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.
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of ±125 mV 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
23°C. The EVM is designed to operate properly with certain components above 50°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.
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Texas Instruments
Post Office Box 655303
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Copyright 2003, Texas Instruments Incorporated

Information About Cautions and Warnings
iii
Preface
Read This First
About This Manual
This users guide describes the characteristics, operation, and use of the
ADS1202 Modular EVM. A complete circuit description as well as schematic
diagram is included.
How to Use This Manual
This document contains the following chapters:
-Chapter 1—EVM Overview
-Chapter 2—Power Supply Options
-Chapter 3—EVM Operation
-Chapter 4—ADS1202 Modular EVM BOM and Schematic
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.

Trademarks
iv
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.
Related Documentation From Texas Instruments
To obtain a copy of any of the following TI documents, call the Texas
Instruments Literature Response Center at [phone] or the Product
Information Center (PIC) at [phone]. When ordering, please identify
this booklet by its title and literature number. Updated documents can also be
obtained through our website at www.ti.com.
Data Sheet: Literature Number:
ADS1202 SBAS275
User’s Guide: Literature Number:
5-6K Interface Board EVM SLAU104
FCC Warning
This equipment is intended for use in a laboratory test environment only. It gen-
erates, 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 en-
vironments 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.
Trademarks
TI logo is a trademark of Texas Instruments.

Contents
v
Contents
1 EVM Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Analog Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Digital Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Power Supply Options 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 EVM Operation 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 ADS1202 Modular EVM BOM and Schematic 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 ADS1202 Modular EVM BOM 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Schematic 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
4-1. Bill of Materials 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi

1-1
EVM Overview
EVM Overview
The ADS1202 modular EVM provides direct modulator output to a host
processor and allows all operating modes of the ADS1202. It provides various
isolation options for a variety of applications.
The new modular EVM form factor allows for direct evaluation of the ADC’s
performance and operating characteristics. This EVM is compatible with the
5-6K Interface Board (SLAU104) from Texas Instruments.
-Direct modulator output
-Various isolation options
-Direct operation with a variety of DSK platforms from Texas
Instruments
Topic Page
1.1 Analog Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Digital Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Analog Interface
1-2
1.1 Analog Interface
The ADS1202 modular EVM is designed for easy interfacing to multiple analog
sources. 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 J1. Connector J1 provides access to the ADS1202 input pins.
The modulator + input terminal is connected to pin 2, the - input terminal is
connected to pin 4. Pins 1-19 are connected to analog ground.
1.2 Digital Interface
The ADS1202 modular EVM is designed for easy interfacing to multiple control
platforms. 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 J2. This header/socket combination provides access to the
clock and data output pins of the ADS1202 Sigma Delta modulator.
Signal Description
J2.1 Unused
J2.3 SCLK Serial clock input (for use with MODE 3 Operation)
J2.5 CLKR Modulator clock output (for use with MODES 0, 1 and 2)
J2.7 Unused
J2.9 Unused
J2.11 Unused
J2.13 SDO Bit stream data output from ADS1202
J2.15 Unused
J2.17 Unused
J2.19 SPARE

2-1
Power Supply Options
Power Supply Options
The ADS1202 modular EVM board requires 5-V dc for the ADS1202 circuit.
When used in combination with the 5-6K interface boards, J5 (located on the
bottom side of the PWB) provides connection to the common power bus
described in document SLAU104. For isolated applications, J4 provides
power to isolation components including optocouplers or LVDS drivers. For
evaluation purposes, TP3 and TP4 can be shorted together to provide a
common power source across the isolation boundary. Similarly, TP2 and TP6
can be shorted together to provide a common ground.
When used as a stand alone EVM, the ADS1202 power can be applied to J3.
While filters are provided for all power supply inputs, optimal performance of
the EVM requires a clean, well-regulated power source.
Chapter 2

2-2

3-1
EVM Operation
EVM Operation
The analog input source can be applied directly to J1 pins 2 and 4. Series
resistors R10 and R11 as well as capacitors C8, C9, and C10 provide filtering
to the input of the ADS1202.
The digital control signals can be applied directly to J2 (top or bottom side). The
ADS1202 modular EVM can also be connected directly to a DSP interface
board.
Footprints are provided on the PWB which allow a variety of isolation options.
Transformers, optoisolators or optocouplers may be installed for evaluation of
different isolation techniques.
The EVM uses two solder shorts at position U3 to provide direct nonisolated
operation of the ADS1202, for isolated operation, these shorts may be
replaced with isolation devices such as the IL711 from NVE (close W3 pins
2-3), HCPL-2631 optocouplers (close W3 pins 1-2) or transformer circuits
such as those described in application note SLAA096.
The operating mode of the ADS1202 can be controlled by placing shunt
jumpers on W1 and W2. When the jumper is open (not installed) logic 1 is
applied to the mode pins. W1 controls M0, W2 controls M1. The EVM is
configured with both W1 and W2 closed, providing Mode 0 operation.
Jumper
W1 W2 Description
closed closed Mode 0 operation –processor reads MDAT on rising clock
edge only
open closed Mode 1 operation –processor reads MDAT on every clock
edge
closed open Mode 2 operation –Manchester decoding required
open open Mode 3 operation –requires external clock ( optional - short
TP1 to TP7)
To verify the ADS1202EVM is functional, arrange W1 and W2 for Mode 0
operation by ensuring the shunt jumpers are installed (factory default
conditions). Apply 5-V power to the EVM through J3. Apply a 200-kHz
sinusoidal wave (250 mVPP) to J1.2 referenced to J1.4.
Chapter 3

3-2
Using an oscilloscope view the MCLK and MDAT output signals on J2.5 and
J2.13 respectively. The outputs should look similar to those in the following
figure:
Slowly increase the time base of the oscilloscope. As the time base increases,
the sine wave applied to the input terminals should begin to appear on the
oscilloscope screen as shown below. These screen shots were taken using a
Tektronics digital oscilloscope model TDS-754D set for Hi Resolution mode.

4-1
ADS1202 Modular EVM BOM and Schematic
ADS1202 Modular EVM BOM and Schematic
This chapter contains the bill of materials and the schematic
Topic Page
4.1 Bill of Materials 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Schematic 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 4

ADS1202 Modular EVM BOM
4-2
4.1 ADS1202 Modular EVM BOM
The following table contains a complete bill of materials for the ADS1202 EVM.
Table 4-1.Bill of Materials
Designators Description Manufacturer Mfg. Part Number
C1, C8 1 nF, 0805, ceramic, NPO, 50 V, 5% PhyComp 0805CG102J9B200
C2, C3, C4, C9, C10 0.1 µF, 0805, ceramic, X7R, 50 V, 10% Panasonic ECJ-2YB1H104K
C5, C6 33 µF, 16V, Aluminum, Size C Cornell Dubilier AVS336M16C12T
C7, C8, C11-C15 Not installed
FB1, FB2 SMT, EMI beads, Z=47 Ωat 100 MHz Fair-Rite 2743019447
J1, J2 (top side) 10 Pin, dual row SMT header (20 positive) Samtec TSM-110-01-T-DV-P
J1B, J2B
(bottom side) 10 Pin, dual row, SMT socket (20 positive) Samtec SSW-110-22-F-D-VS-K
J3, J4 2 Terminal screw connector OST ED1514
J5 (bottom side) 4 Pin, dual row, TH header (8 positive.) Samtec SSW-105-22-F-D-VS-K
R1, R2 10 kΩ, 0805, 0.1 W resistor Yageo America 9C08052A1002JLHFT
R3, R5, R10, R11 33 Ω, 0805, 5%, 0.1 W resistor Yageo America 9C08052A33R0JLHFT
R4, R6-R9, R12-R16 Not installed
TP1, TP3, TP4, TP5,
TP7 Red test point loop Keystone 5000
TP2, TP6 Black test point loop Keystone 5001
U1 ADS1202 Texas
Instruments ADS1202
U2, U3 Not installed
T1, T2 Not installed
W1, W2 2 Pin header Samtec TSW-102-07-L-S
W3 3 Pin header (not installed) Samtec TSW-103-07-L-S

Schematic
4-3
ADS1202 Modular EVM BOM and Schematic
4.2 Schematic
The schematic diagrams are shown on the following pages.

A
B
C
D
D
C
B
A
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Engineer:
AVdd
C2
0.1uF
C1
0.01uF
C3
0.1uF
+C5
33uF
C4
0.1uF
+C6
33uF
FB1
FB2
AVdd
1
2
J3
1
2
J4
1 2
3 4
5 6
7 8
910
11 12
13 14
15 16
17 18
19 20
J2
R3
33
1 2
3 4
5 6
7 8
910
11 12
13 14
15 16
17 18
19 20
J1
R1
10K
R2
10K
TP2
1 2
3 4
5 6
7 8
910
J5
+5Va
+5Va
+Vd
ADS1202 - miniEVM Schematic
A
11
B
Tom Hendrick
Tom Hendrick
VIN+
2
GND 5
VIN-
3
Vdd 8
M1 4
M0 1
MDAT 6
MCLK 7
U1
ADS1202
W1 W2
R5
33
TP4
TP3
R10
33
R11
33
C8
1nF
C9
.1uF
C10
.1uF
T2
T1
C11
0
C12
0
R12
TBD
R13
TBD
3
7
8
5
6
2
Vcc
1
GND 4
U2
SN65LVDX34
C7
NI
R8
TBD
R9
TBD
R6
TBD
R7
TBD
3
7
Vdd2 8
GND2 5
6
2
Vdd1
1
GND1
4
U3
IL711
MCLK
MDAT
MDAT
MCLK
ISO_MDAT
ISO_MCLK
ISO_MCLK
ISO_MDAT
ISO_Vd
ISO_Vd
ISO_GND
ISO_GND
ISO_GND
ISO_GND
ISO_GND
TP5
TP6
ISO_GND
TP1 TP7
ISO_GND
C15
NI
AVdd R15
TBD
R16
TBD
W3
C16
NI
AVdd
ISO_Vd
R4
SIT
R14
SIT

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