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TLV8801: Gas sensor design computation

Part Number: TLV8801
Other Parts Discussed in Thread: TLV8802

Hi Experts,

We have this computation queries/clarification raised by client from our D/S of TLV8801/TLV8802. Snapshot as attached below.

TLV8801/TLV8802 320 nA Nanopower Operational Amplifiers for Cost-Optimized Systems

1. U1 output goes CE. If Vref = 1V , U1 output also 1V? Therefore CE also 1V??

2. Why R2 10k?

Thank you for your support.

Regards,
Archie A.