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ADS1271EVM Hardware Details
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5 ADS1271EVM Hardware Details
The ADS1271EVM is designed to easily interface with multiple control platforms. Dual-row, header/socket
combinations of J1 and J2 allow connection to external circuitry for evaluation and debug.
5.1 Jumpers and Switches
The jumpers and switches functions are shown below in Table 4
Table 4. Jumper and Switch Descriptions
Jumper/Switch Functions Descriptions
Primary analog input/external reference connectors (from
J1 Analog inputs/external reference (primary)
MMB0)
J2 Digital Interface signals Serial Interface and GPIO signals (from MMB0)
J3 Power Power supply connections (from MMB0)
J4 Analog inputs/external reference (aux) Auxiliary analog input/eternal reference connector for U7
J5 Analog inputs/external reference (aux) Auxiliary analog input/eternal reference connector for U7
J6 Power Power selection and supply monitoring
J7 Format/Mode Selection Connection of Format and Mode controls to ADCs
Selection of which analog signal header to connect to buffer,
S1 Analog input to buffer
U5
Selection of which analog signal header to connect to buffer,
S2 Analog input to buffer
U6
S3 U7 Reference selector Select source of reference for U7
S4 U7 Analog Input selector Select source of analog input for U7
S5 U8 Reference selector Select source of reference for U8
S6 U8 Analog Input selector Select source of analog input for U8
S7 Interface selector Select interface type (FORMAT)
5.2 Analog Connections
5.2.1 Analog Interface, J1, J4, and J5
The ADS1271EVM features several analog input options. Signals can be routed directly to the converters
or can pass through the onboard buffer amplifiers (U5, U6). Signals can be applied to the board through
the standard modular EVM analog connector (J1) or brought in through the auxiliary input connectors (J4,
J5). A set of switches selects which analog connector source is used and whether the buffer amplifiers are
in the signal path. These switches enable several configurations for evaluation. Switch operation and
analog path configuration are described in
Section 5.2.2 , Table 6 , and Table 7 .
For maximum flexibility, the ADS1271EVM 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. This header/socket provides access to the analog input pins of the
ADS1271.
Table 5. Analog Interface Pinout (J1)
Pin Number Signal Description
J1.1 AIN0N ADS1271 (U7) AINN
J1.2 AIN0P ADS1271 (U7) AINP
J1.3 AIN1N ADS1271 (U8) AINN
J1.4 AIN1P ADS1271 (U8) AINP
J1.5 Unused
J1.6 Unused
J1.7 Unused
8 ADS1271EVM and ADS1271EVM-PDK User's Guide SBAU107C – November 2004 – Revised November 2014
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