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Original question:

PCM6340-Q1: ADC input bias

PCM6340-Q1: recommended input circuit

Shinji Tsuji
Genius 12358 points
Part Number: PCM6340-Q1

Hi team,

Could you advise the recommended input configuration for differential 8Vrms and single-ended 2Vrms input signal?

Maximum HVDD=10V.

regards,

  • 0
    TI__Mastermind 23050 points

    Hi Tsuji-san,

    The recommended input circuit depends on whether you are AC or DC coupling. The inputs need to be biased externally and or a differential input, the value of the external bias resistor is recommended to be half of the microphone impedance, whereas for a single-ended input, the external bias resistor is recommended to be the same as the microphone impedance.

    If you are using line inputs then you can select the bias resistors to satisfy your input impedance requirements.

    Best,

    Zak