Texas Instruments ADS1178EVM, Руководство пользователя, Страница: 5 / 52

3 Digital Interface
3.1 Serial Data Interface
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Digital Interface
In addition to J9 (and J7), terminal block J8 also provides additional analog inputs to accommodate the
large number of input channels available on the ADS1278.
Most of the pins on J7, J8 and J9 are directly connected, with no filtering or protection. Use appropriate
caution when handling these pins.
Table 1 and Table 2 summarize the pinouts for analog interfaces J9/J7
and J8, respectively.
Table 1. J9/J7: Analog Interface Pinout
Pin Number Signal Description
J9.1, J7-2 A1N AINN1, ADS1278
J9.2, J7-3 A1P AINP1, ADS1278
J9.3, J7-4 A2N AINN2, ADS1278
J9.4, J7-5 A2P AINP2, ADS1278
J9.5, J7-6 A3N AINN3, ADS1278
J9.6, J7-7 A3P AINP3, ADS1278
J9.7, J7-8 A4N AINN4, ADS1278
J9.8, J7-9 A4P AINP4, ADS1278
J9.18 EXTREFN External Reference source input (– side of
differential input)
J9.20 EXTREFP External Reference source input (+ side of
differential input)
J9.10-16 (even) Unused —
J9.15 Unused —
J9.9-19 (odd), J7-1 AGND Analog ground connections (except J1.15)
Table 2. J8: Supplemental Analog Interface Pinout
Pin Number Signal Description
J8.1 GND Analog ground
J8.2 A5N AIN5N, ADS1278
J8.3 A5P AIN5P, ADS1278
J8.4 A6N AIN6N, ADS1278
J8.5 A6P AIN6P, ADS1278
J8.6 A7N AIN7N, ADS1278
J8.7 A7P AIN7P, ADS1278
J8.8 A8N AIN8N, ADS1278
J8.9 A8P AIN8P, ADS1278
The ADS1278EVM 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 J5. This header/socket provides access to the digital control and serial data pins of the
ADC. Consult Samtec at
http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating
connector options.
SBAU129C – November 2007 – Revised July 2008 ADS1178EVM, ADS1278EVM, ADS1178EVM-PDK, and ADS1278EVM-PDK 5
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