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LMP91200: Low-cost Opamp for PH sensor

Part Number: LMP91200
Other Parts Discussed in Thread: OPA391, LMP7721, LM4140, OPA928, TL431, TL432LI, TL431LI, LPV821, TL432, LM4040, REF35

Hi Ti-engineers.

We have a product used PH sensor, we designed and used with LMP91200.

But now we need a low-cost solution.

Could you please help to check and give me an advice for Opamp and Vref ?
ex: analog output range (0.5-1.8V)

Thanks for yours support.