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PCM1809: PCM1809 no external AC-coupling capacitors

Kevin Huang8
Genius 3955 points
Part Number: PCM1809

Tool/software:

Hi Team,

Data sheet Figure 7-1. Two-Channel Analog Microphone Recording Diagram for 3.3-V AVDD Operation no external AC-coupling capacitors, are there any special technologies?

  • 0
    TI__Mastermind 22550 points

    Hi Kevin,

    PCM1809 supports both AC and DC coupling input configurations. The customer can choose to AC-couple the inputs, allowing the device to internally bias the input pins to the voltage common mode, or the customer can drive their own common mode voltage. The preferred Vcm is Vref/2 -> 2.75/2 = 1.375V for a differential input signal with AVDD = 3.3V.