Difference between pseudo-differential and single-ended mode of an ADC

Document created by analog-archivist Employee on Feb 23, 2016
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Can you explain the difference between pseudo-differential mode of an ADC and
single-ended mode?

 

In single-ended mode you use one input only for your signal.

In pseudo differential mode, a second input is used (IN+ and IN-).  On the
positive input IN+ the single-ended signal is applied.

On the negative input IN- you apply a DC voltage to shift your signal. The
voltage applied to this input provides an offset from ground or a pseudo ground
for the VIN+ input. The benefit of pseudo differential inputs is that they
separate the analog input signal ground from the ADC’s ground allowing dc
common-mode voltages to be cancelled.
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