AD7934 full-differential mode

Dear All,

I'm using AD7934 with FPGA interface. I want to use AD7934 in differential mode.

I've used AD8138 for converting single-end to differential signal.

ADC is working in single-end mode (M0=0,M1=0) quite nicely. I tried all four input channels VIN0-3 in single mode all are working nice.

But When I configure ADC  for fully diferential and even pseudo differential mode but no success. Output keeps fluctuating.

Kindly help me

Thanx in advance

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  • 0
    •  Analog Employees 
    on Mar 20, 2013 10:24 PM

    Hi,

    It's great that you get proper results in single-ended mode. I am assuming you configured the AD7934's input channels for fully differential and pseudo differential mode by setting MODE0 and MODE1 as detailed in Table 9 of the datasheet. Did you follow the typical connection as discussed in the datasheet? Can you share your circuit schematics as well as scope shots of your output data for a given input so I can take a look?

    Regards,

    Karen

Reply
  • 0
    •  Analog Employees 
    on Mar 20, 2013 10:24 PM

    Hi,

    It's great that you get proper results in single-ended mode. I am assuming you configured the AD7934's input channels for fully differential and pseudo differential mode by setting MODE0 and MODE1 as detailed in Table 9 of the datasheet. Did you follow the typical connection as discussed in the datasheet? Can you share your circuit schematics as well as scope shots of your output data for a given input so I can take a look?

    Regards,

    Karen

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