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AD4134 driven by LTC6373 - do I need clamping diodes?

Category: Hardware
Product Number: AD4134

Hi experts.

We have designed an analog front end circuit consisting of four LTC6373 differential PGAs driving the four differential inputs of an AD4134. This is performing very well.

However, we have not included any ADC overvoltage protection (e.g., clamping diodes). FYI, the LTC6373 is powered from +-15V. 

Should we include protection? Is there a reference design for protecting fully differential ADC circuits?

Thanks, Steve

Clarified PGA supply voltage
[edited by: squirest at 1:13 PM (GMT -4) on 12 Mar 2023]
Parents Reply
  • hi Steve

    ADC input will have internal ESD protection diode, as long as the inputs of the LTC6373 are protected we dont need any protection for the ADC inputs. This is true for most of the ADC reference designs.

    we are in process of releasing a design with LTC6373+AD4134 and again we dont use any protection for the ADC inputs in that as well