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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.

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・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.

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

Best regards,

Satoshi