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TAS5756M: TAS5756M:How to configure Clock Slave Mode with SLCK PLL to Generate Internal Clocks (3-Wire PCM)

Part Number: TAS5756M

1:TAS5756 is slave mode as 3-wire PCM mode. There is not mclk, just connect blck and lrclk in my hardware principle chart like below:

I'd like add that, Bclk is 1.536MHZ, LRclk is 48KHZ, FORMAT is 16bit .

2: As note in 8.3.3.4, I disable auto set mode with Page0-R37 bit 1  and ignored MCLK, configure the register R37 value is 0x12;

      Like 8.3.3.4 introduce: I should configure below:

3: My register configure is like below:

Page0:

1: R4—— 0x00 (disable PLL)

2: R37—— 0x12 (ignored MCLK err report and disable auto set mode)

3: R13—— 0x10 (PLL reference clock is bclk)

4: R20—— 0x0 (P ==1)

5: R21—— 0x20 (J ==32)

6: R22—— 0x0 ( D==0)

7: R23—— 0x0 ( D==0)

8: R24—— 0x1 (R==2)

9: R4 —— 0x01(enable PLL)

10: R14—— 0x10 (DAC clock source is PLL)

11: R27—— 0x1 (DSP clock divide)

12: R28—— 0xf  (DAC clock divide)

13: R29—— 0x3 (CP clock divide)

14: R30—— 0x7 (OSR clock divide)

15: R34—— 0x10 This bit enables or disables the 16x interpolation mode.(I donnot know what this bit mean? Can you help me?)


4: But so sorry, there is no sound. Thank you for review my configure, if there are any error?

  • Hello! The clocking set up is very important for this device in slave mode. Section 8.3.3.3 Clock Slave Mode with 4-Wire Operation (SCLK, MCLK, LRCK/FS, SDIN) covers this detail as follows:

    The TAS5756M device requires a system clock to operate the digital interpolation filters and advanced segment
    DAC modulators. The system clock is applied at the MLCK input and supports up to 50 MHz. The TAS5756M
    device system-clock detection circuit automatically senses the system-clock frequency. Common audio sampling
    frequencies in the bands of 8 kHz, 16 kHz, (32 kHz – 44.1 kHz – 48kHz), (88.2 kHz – 96 kHz), and (176.4 kHz –
    192 kHz) are supported.
    NOTE
    Values in the parentheses are grouped when detected, for example, 88.2 kHz and 96 kHz
    are detected as double rate, 32 kHz, 44.1 kHz and 48 kHz are detected as single rate and
    so on.
    In the presence of a valid bit MCLK, SCLK and LRCK/FS, the device automatically configures the clock tree and
    PLL to drive the miniDSP as required.
    The sampling frequency detector sets the clock for the digital filter, Delta Sigma Modulator (DSM) and the
    Negative Charge Pump (NCP) automatically. Table 2 shows examples of system clock frequencies for common
    audio sampling rates.
  • Jeff, Thanks for your quick response in the weekend!

    As stated above, we are using 3-wire PCM (8.3.3.4 Clock Slave Mode with SLCK PLL to Generate Internal Clocks (3-Wire PCM)), there is NO MCLK applied to the codec. Would you please help on the reg configure in this mode? Thanks.

  • Jeff, Thanks for your quick response in the weekend!

    As stated above, we are using 3-wire PCM (8.3.3.4 Clock Slave Mode with SLCK PLL to Generate Internal Clocks (3-Wire PCM)), there is NO MCLK applied to the codec. Would you please help on the reg configure in this mode? Thanks.
  • Dear Jeff:
    Because we have plan to arrange the production of PP on 21th SEP.
    And the issue is influence our schedule.
    Could you kindly help to have a conf call to discuss the case?
    Pls. help us! And we can wait you any time.
    We look forward to hearing from you!
    Thanks!

    Best regards
    Luck Wu
  • Hello Luck! Yes, we can take this off of e2e and have a call. Andy Liu is the key person to work through this, and he is on his way back to Dallas today and can likely have a call on Tuesday. I'll loop everyone in on email. Thanks, Jeff
  • Also, what is your email so that we can loop everyone in to the discussion? Thanks, Jeff
  • Hi Jeff, my email is lian.wu@avnet.com.
    Pls. kindly help to send a meeting message.
    Thanks a lot!
    Best regards
    Luck