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Hi,

There is an article called” EXPLORING DIFFERENT SAR ADC ANALOG INPUT ARCHITECTURES” on analog devices website.

About Pseudo Differential, it says that If a pseudo differential device with limited IN voltage range, such as the AD7980, needs to reject undesired signals greater than the absolute input voltage range, the signal chain designer may need to consider an instrumentation amplifier to remove these larger common modes before presenting the signal to the ADC. For differential application, as with the pseudo differential devices, if large common modes are present in the system, an instrumentation amp should be used to condition the bulk of the common mode. Would you please show me an reference circuit that explains this approach?

Thanks!



Adding tags for internal tracking purposes
[edited by: tschmitt at 2:03 PM (GMT 0) on 20 Apr 2020]