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multiple AD5791 with parallel SDO (SPI)

Question asked by slapper on Feb 6, 2017
Latest reply on Feb 7, 2017 by slapper

Do I need to do anything odd to make the SDO pins tristate?
I have a single AD5791 on one board that I can write and read with no problems.

On another board, with the same hardware configuration but pairs of DACs connected to the same SPI bus, I can't seem to read from the DAC.  Exactly the same code, same timing etc, I just get garbage in paired DACs case.

 

I have tried specifically setting SDO in the non-addressed DAC to tristate in the CONTROL register, but that doesn't seem to help either.

 

cheers

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