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AD7989 in pseudo-differential mode?

Question asked by RCecil on Mar 16, 2016
Latest reply on Mar 25, 2016 by RCecil

Hello,

 

I am about to use the 18-bit SAR ADC AD7989 to sample data from a sensor. The sensor outputs voltage that is referred to some offset voltage (that is rather stable, but can slightly float - i.e. almost DC). The signal bandwidth is cca 30 kHz.

Can I use the AD7989 in pseudo-differential mode without compromising its performance? - I.e. feed the offset voltage to one input pin of the ADC and the signal voltage to the second input pin?

 

The datasheet is not quite clear about it - it states: "the AD7989-1/AD7989-5 sample the voltage difference between the IN+ and IN− pins."

 

Thank you, Roman

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