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Original question:

TAS2505: TDM8 stream

TAS2505: TAS2505 TDM clocks

Ian Costabile
Prodigy 40 points
Part Number: TAS2505
Other Parts Discussed in Thread: PCM3168

Tool/software:

Hello,

Could you please confirm that TAS2505 can decode a TDM signal with only BCLK, FSYNC (WCLK) and DIN?

There is no need to feed in the MCLK as well, does it?

Thank you

  • +1
    TI__Guru** 106965 points

    Hi Ian,

    TAS2505 can operate without MCLK, make sure BCLK is at least 512kHz as that's the minimum clock frequency supported by the internal PLL.
    In TAS2505 documentation TDM is also referred to as DSP, make sure to configure the device in that mode.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0
    Prodigy 40 points

    Hi Ivan, thank you so much for clarifying this. I have one more related question, I need to connect the HP output from the TAS2505 to another codec, to the analog input of the PCM3168. I know it's not the most usual application, but because I need to have separated clocks in this scenario that's the solution I found. The PCM3168's system examples (10.3 on the datasheet) show that an op-amp is typically implemented to its analog inputs. Would it be possible to connect directly the HP out (TAS2505) to the PCM3168 input, or what would you recommend as a minimum implementation (I have limited board layout).

    Thank you,
    Ian

  • 0 in reply to Ian Costabile
    TI__Guru** 106965 points

    Hi Ian,

    The headphone output driver is designed for load impedance of 16-32 Ohms, in this case power delivery should not be a concern so connecting directly to the ADC may work OK. Still would be good to test at least using EVMs.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 40 points

    That's great to know, thanks Ivan!