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ADS1601: ADS1601: too high DC offset

Giuseppe Modugno70
Prodigy 100 points
Part Number: ADS1601

I have a circuit with FPGA that reads signal from ADS1601. I'm sampling a 100kHz signal.

It seems I have a relatively high offset in DC when applying some signal at the ADC input, for example a simple 1kHz sinusoidal signal. I observe this on many (more than 100) boards, so it isn't caused by a single damaged chip.

Is it normal?

  • 0
    TI__Guru 65386 points
    Hi Giuseppe,

    Thank you for your post.

    It's possible that the large offset is introduced by either your signal source, the cables connected to your circuit, or other components in the signal path leading up to the ADC. The best way to determine the the source of the offset is to short the two inputs together and measure the ADC output. Start by shorting the ADC input pins together first (it is recommended to also connect them to mid-supply). The offset you measure here should only be the offset of the ADC itself. If that looks ok, work your way backwards towards the input connection to your circuit. Replace the signal source with a short between the (+) and (-) inputs of your circuit and measure the offset of your entire signal chain.

    If you would like, you may send us screen captures of the data plots with a description of the input configuration.

    Best Regards,