Lockin amplifier AD630

Question

Hi Dear, 
 Can I use a 20k digital potentiomenter (AD5292BRUZ-20) in the differential offset ajust and (other AD5292BRUZ-20) in the commum mode offset adjust?

jeobico · Accepted Answer

Hi fbassan 
 Regarding the resistance value, we recommend using 10k pot. The pot is used to balance the collector current sources of the input transconductance stage and compensates for mismatches in transistor sizes, due to this the 10k value is OK. 
 May we ask the reason why you want to use a digital potentiometer? Is it something about the accuracy of resistance values, or you want to implement a system that can change the resistance values based on the resulting output voltages (feedback control system)? A simple trim pot is also applicable for this application since it is much simpler and cheaper. 
 Regards, JE)

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Lockin amplifier AD630