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strange behavior of DAC7750

Thomas Schlenger
Prodigy 110 points
Other Parts Discussed in Thread: CC3200MOD, DAC7750

For a sensor device i use 2 DAC7750 in daisy chain together with a CC3200MOD. The first versions of the board use the CLR Signal of DAC7750 to reset the device during power up once.After a redesign i have to use the GPIO pin for other purposes.

After various tests i have the following issue: As i change the digital signals for data, there is a low current on the outputs but the input current mirrors the programmed current in supply. So as i would have a internal current flowing from the outputs to ground. The output current is totaly wrong.

Must the CLR Signal be applied to the circuit ?

Does anybody has an idea for this ?

best regards

Thomas

  • 0
    TI__Mastermind 46290 points
    Thomas,

    Could you please share your schematic so I can double-check for any issues there?

    Additionally, could you please share the complete register configuration for each device and the sequence for configuring the device?

    If I do not see any issues with the configuration or schematic I will use your specific sequence in order to replicate the situation in the lab here.
  • 0 in reply to Kevin Duke
    Prodigy 110 points
    Hi Kevin,
    sorry abt. my late answer. I had lots of work with another project. I found that i we had a wrong part on the board, which causes the problem. Now i have 2 board version with and without CLR Signal and both work very fine. Excellent data of the first 50 testboards.
    Thanks a lot and best regards
    Thomas