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ADS131A04EVM: Evaluation with modified ADS131A04EVM

Iwata Etsuji
Expert 6400 points
Part Number: ADS131A04EVM
Other Parts Discussed in Thread: ADS131A04,

Hi team,

Please let us know if you could find any concerns or suggestions to configure ADS131A04EVM H/W and S/W to evaluate ADS131A04 properly, with respect to the following modification items.

1. Shorted AVSS and GND (shorted pin1 - pin2 of JP11), Removed U32 and shorted pin1 - pin5, and Applied 5V to AVDD - AVSS, and 3.3V to IOVDD - GND (shorted JP10, JP8).

2. Shorted TP22 - TP23. (no need?)

3. Use the external clock via J8, with removing R80, R83, and R84.

Best regards,
Iwata Etsuji

  • 0
    TI__Guru* 97775 points

    Iwata-san,

    I know that people have used the ADS131A04EVM to evaluate the device with different processors, but I've never done this myself. However, I have seen E2E posts where people have gotten this to work.

    First, here are a few comments that may be helpful in using the board.

    1. The silkscreen is wrong for S5 and S8. That would mean that when the switch is in the down position, the Header is selected. When the switch is in the up position, the Buffer is selected.

    2. R89 should be removed or the buffer is grounded.

    3. The MOSI and MISO silkscreen is swapped on J3 (pins 3 and 5).

    4. R90 should have been unpopulated, but I think the EVM should still operate normally.

    5. M0, M1, and M2 settings to ground are near the top side for JP5, JP6, and JP7.

    The comments that you mention (1-3) appear correct, but the concern that I have is that this EVM wasn't designed for 5V operation. However, I've looked through the schematic for the AVDD line and I don't see anything that would limit the supply. There is a AVDD test point from TP19 that could be used.

    Does the customer require 5V operation for the 4V reference?

    Joseph Wu