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TIDA-00164: Question about input circuit

Part Number: TIDA-00164

Dear Specialists,

My customer is interested in TIDA-00164(tidu365b) and has a question.

Could you please advise in detail?

----Question

(1) What purpose is C12 of ADC input circuit?

Does this capacitor consist RC filter with R4?

(2)What purpose is R and C near ADS8688 (for example R22,R23 and C33)

Are these charge injection circuit?

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I appreciate your great help.

Best regards,

Shinichi