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TAS2770: Please help review schematic .

Part Number: TAS2770
Other Parts Discussed in Thread: TAS2764

Hi team,

Could you pls help review the schematic for customer? thx

2 questions as below.

1. How to connect if PDMCK and PDMD are not used?

2. Customer reserved SDOUT output as SDIN signal for Acoustic Echo Cancellation. Is it can work? 


  • Hi Jimmy,

    It is recommended to include a 1kOhm resistor in series with the VsenseP/N pins when using a FB filter on the outputs. these filters can cause ringing that may damage the Vsense pins. this 1kOhm resistor is included to dampen any ringing. 

    Otherwise I do not see issue with the schematic

    1) If unused the PDMCK and PDMD can be left floating.

    2) TAS2770 cannot transmit the audio data from SDOUT to be used for echo cancelation. It can transmit the Vsense, which is the real time speaker voltage. It may be possible to use Vsense for echo cancellation. If the audio data is Needed for AEC then TAS2764 is a comparable part which could be used.