Maximum voltage across Analog Input

Hi Rranjan ,

Please refer to the FAQ below that discusses the maximum voltage for different input configurations - differential, pseudo differential, or single ended.

(+) AD777x:What is the input voltage range of the ADC? - Documents - Precision ADCs - EngineerZone (analog.com)

Thanks,
Janine

But maximum voltage limit across analog input pin respect to what? It's not clear, please explain is it with respect to AGND or AIN-?

Hi Rranjan ,

The limits of the AINx+ pin with respect to AINx- (differential analog input) is limited by the "Differential Input Voltage Range" below and depends on the reference voltage.

While the limit of the analog input pins (AINx+, AINx-) with respect to ground is the "Absolute AINx+- Voltage Limits" below and depends on the Analog supplies.

The excel file combines the limitation provided by the reference input and analog supplies to state the analog input limits conforming to both.

Thanks,
Janine

Hi JEstayo,

Is it necessary to integrate AD7770 with any OP-AMP to get better accuracy? If yes, could you please suggest with any application circuit for AD7770.

Hi Rranjan ,

You can use the integrated PGA with gain you can choose from 1, 2, 4, or 8.

Thanks,
Janine

Hi JEstayo

I am asking for better accuracy or precision, or there would be any design issue if I don't use any OPAMP with this.

Thanks,

Ravi