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ADG731 Introducing Noise while measuring very low currents

Question asked by ShirishKH on Apr 27, 2018
Latest reply on May 8, 2018 by Davidforde



I am using ADG731 32 to 1 Analog mux in our board design, the design is about capturing the analog sensor current with 22 current outputs (in range of 800nA to 2uA) and measuring it with with a single ADC in a controller. The nA range current is converted to Voltage using Current to voltage conversion circuit using OPAMPs. 

My Question is can Analog mux ADG731 introduce any noise to the sensor current which is already very low in nA Range. Are we using the ADG731 correctly.? Can the ADG731 alter the sensor current because of its own circuitry?

if Yes How much it will affect to sensor current.?


Advance Thanks