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PCM1862: TAS5825M + PCM1862

Ian Wang
Mastermind 29325 points
Part Number: PCM1862
Other Parts Discussed in Thread: TAS5825M, PCM1808, TLV320ADC3140

Hi Sir,

My customer looking for ADC after TAS5825M(with LC filter), would you pls help recommends which ADC is suitable under condition?

Condition of TAS5825M:

PVDD=20V

Po=10W

RL=4ohms.

Thanks, Ian.

  • 0
    TI__Mastermind 23050 points

    Hi Ian,

    We do not have an ADC that can directly support the output range of the TAS5825M. We don't typically see customers placing an ADC after the amplifier since the amp is driven with a digital input and interfaces with the speaker. Is your customer looking for an echo reference signal from the amplifier for an acoustic echo cancellation application? Some of our smart amplifiers are able to provide this echo reference signal directly. If this is what your customer needs you may want to ask another question with the TAS5825M part number so that it will go to the amplifier team and they should be able to help suggest a suitable implementation.

    Best,

    Zak

  • 0 in reply to Zak Kaye
    TI__Mastermind 29325 points

    Hi Zak,

    Thanks for answer.

    Yes, I know TAS5825M have GPIO can set SDOUT for echo cancellation. but we cannot do that in customer's application.

    Customer using a chip for echo cancellation but only can be MASTER, it means this chip cannot accept I2S clock from TAS5825M.

    That's why they are looking for single ADC chip.

    Thanks, Ian.

  • 0 in reply to Ian Wang
    TI__Mastermind 23050 points

    Hi Ian,

    I'm not sure I understand your customer requirement. The TAS5825M acts as a slave on the audio serial bus, so the clocks will need to provided by another chip acting as the master anyways. I do not know how the echo reference works on TAS5825M as that is supported by a different team, but I do know that other devices in the portfolio allow an echo reference signal to be output directly on the DOUT line that interfaces with the host processor. It's not clear to me why this wouldn't work in your customer application?

    If they do need an ADC then as I mentioned there aren't any that can handle those signal levels directly, but you could always scale the signal down with an input divider. If you need assistance selecting a suitable ADC then it would be helpful to know what kind of specifications and features are needed for the application. We have very simple hardware controlled ADCs like the PCM1808 that offer reasonable performance but few bells and whistles or newer devices like the TLV320ADC3140 that offer better performance and many more features. 

    Best,

    Zak