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ADS4222: Sample clock noise on analog inputs

Nimrod Zarmi
Prodigy 10 points
Part Number: ADS4222

Hello,

I get the sample clock frequency (30-60 Mhz) riding on the input analog signal. See image example below of a sine wave.

Of course when the device is reset (not clocked) the input signal looks smooth.

I'm trying to understand the source. Any ideas?

Thanks

  • 0
    TI__Guru* 91947 points

    Nimrod,

    Try using a band-pass filter on the IF input and clock as well. Make sure the power is clean coming into the board. Use a differential scope probe and verify the analog input is clean at the ADC input. 

    Regards,

    Jim