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LMP8603: How to calibrate Voffset on Reduce Gain condition

Guru 18160 points
Part Number: LMP8603
Other Parts Discussed in Thread: LMP8601

Please let me know about idea for fixed Voffset on Reduce Gain condition, detailed information is below.


・Vs: 5V and Voffset: 2.5V

・On datasheet page-23, Rr is using digital potentiometer and adjust Gain. 

  But when Rr value (= Gain) is change, A2 input voltage also decrease, as a result LMP8603 can not output less than Voffset. 

・If change Rr to Capacitor, Vs/2 output was clear but higher Gain for customer request. 

・If change LMP8603 to LMP8601 and Increase Gain condition, maybe clear but occur layout change.


If there any idea for constant output referenced Vs/2, it is great helpful.

Best regards,