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AD7606-4 malfunction

I'm currently using a AD7606-4 to measure with two of it's channels the outputs from two OpAmps in the +-5V range and forward the result in the serial interface to a fiber optics receiver. However, I am having issues and I don't receive any signals from the Data outputs.

I have observed the malfuncion of the REGCAP B pin, in which I don't see any ouput while I do see it in REGCAP A (I'm using an external reference), and I don't see the correct output in REFCAPA and REFCAPB (I see 0V). I have also observed that the IC gets unusually hot, and in my board I have been having an unusually high power consumtions that causes the 5V input to be reduced to ~4.6V, which supplies the whole system.

Can anybody give me a clue? I'm happy to help with any missing info.

Thanks in advance

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  • Forget about it, there was a tin drop in between pin 39 and 40 that shorted REGCAP B to GND, which caused all the problems mentioned above.

    I am now able to read and communicate with the ADC with no problems.

    Besides that, I would like to mention that it is possible to communicate with this ADC (at least with AD7606-4) setting the CS to logic low permanently (instead of requiring a high-to-low transition to put the output pins out of three-state). I couldn't find this information in the datasheet explicitly (it was just mentioned for the paralel data transfer).

    Still, thanks a lot for your time.

    Fernando

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  • Forget about it, there was a tin drop in between pin 39 and 40 that shorted REGCAP B to GND, which caused all the problems mentioned above.

    I am now able to read and communicate with the ADC with no problems.

    Besides that, I would like to mention that it is possible to communicate with this ADC (at least with AD7606-4) setting the CS to logic low permanently (instead of requiring a high-to-low transition to put the output pins out of three-state). I couldn't find this information in the datasheet explicitly (it was just mentioned for the paralel data transfer).

    Still, thanks a lot for your time.

    Fernando

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