Texas Instruments ADS1271EVM User Manual page 3

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Pin Number
J1.1
J1.2
J1.3
J1.4
J1.5
J1.6
J1.7
J1.8
J1.15
J1.18
J1.20
J1.9-J1.19 (odd)
J1.10-J1.16 (even)
Pin Number
J4.1
J4.2
J4.3
J4.4
J4.5
Pin Number
J5.1
J5.2
J5.3
J5.4
J5.5
3 Digital Interface
The ADS1271EVM is designed to easily interface with 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 provides access to the digital control and serial data pins of the
ADS1271. Consult Samtec at
options.
Because the ADS1271 devices are capable of daisy-chaining, this EVM has been designed to permit
stacking; up to 4 EVMs can be stacked, allowing for 8 devices to be placed in a signal chain. To
accomodate stacking of EVMs, J2 has some different connections on the top and the bottom side of the
board. Differences between top and bottom connectors are highlighted in
SBAU107 – November 2004
Table 1. Analog Interface Pinout (J1)
Signal Description
AIN0N ADS1271 (U7) AINN
AIN0P ADS1271 (U7) AINP
AIN1N ADS1271 (U8) AINN
AIN1P ADS1271 (U8) AINP
Unused
Unused
Unused
Unused
Unused
REF(-) External reference source low side
REF(+) External reference source input (2.5V NOM)
GND Analog ground connections (except J1.15)
Unused
Table 2. Auxiliary Analog Input 1 Pinout (J4)
Signal Description
AUX1P Auxiliary Signal Input 1 - Positive terminal
AUX1N Auxiliary Signal Input 1 - Negative terminal
AUXREF1P Auxiliary Reference Input 1 - Positive terminal
AUXREF1N Auxiliary Reference Input 1 - Negative terminal
GND Ground
Table 3. Auxiliary Analog Input 2 Pinout (J5)
Signal Description
AUX2P Auxiliary Signal Input 2 - Positive terminal
AUX2N Auxiliary Signal Input 2 - Negative terminal
AUXREF2P Auxiliary Reference Input 2 - Positive terminal
AUXREF2N Auxiliary Reference Input 2 - Negative terminal
GND Ground
www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector
ADS1271EVM & ADS1271EVM-PDK
Digital Interface
Table 4.
3