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ADS8681: Using a sensor with a differential output, how can I make use of the full dynamic range?

Lauren Mayfield
Expert 7180 points
Part Number: ADS8681
Other Parts Discussed in Thread: ADS9226

Hi team, 

If I have a differential output signal (voltage sensing from the AMC33x), and since this device has a single-ended input, how can I make use of the full dynamic range instead of only using half the voltage of the AMC33x? Do I have to use a differential input device like ADS9226? If so will the "pseudo-differential" input work and what is the difference between pseudo-differential and differential?

Thanks,
Lauren

  • 0
    TI__Guru**** 172846 points

    Hi Lauren,

    You could use an amplifier to convert the differential output to a single ended signal as shown in this tech brief, or you could use a differential input ADC.  The pseudo differential devices usually have some restriction on the (-) input voltage range.  In the case of the ADS9226, that is vREFIN +/- 100mV.  Devices like the ADS8920 have a fully differential input, so that might be more appropriate for your situation.