Hi, need an output INA voltage adjustment in a range of few mV. I must take into consideration charge pump power supply noise and cause cirquit operates with 30mkV values- think that such scheme works, isn't it:
If you are asking if the circuit from the PGA204/05 Datasheet will work to adjust offset for instrumentation amplifiers, then yes. What is the specification on the charge pump? Noise should never be induced into the reference. Easier said than done.
Charge pump will give ripple near 10mV into power supply rails. We can't connect 10KOhms pot directly to power supply rails cause we will have ripple affecting A3 + input in INA- that's why I asked about cirquit using REF200(it gives 100uA +/-0.2% output with max 1nA noise).