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SRC4192: Mode Master clock connecting to PCM5142

Tony Crocker
Prodigy 110 points
Part Number: SRC4192
Other Parts Discussed in Thread: PCM5142

I am connecting the SRC4192 to the CS8416 and the PCM5142 with the intention of upsampling 16 bit 48kHz to 24 bit 96 kHz.  Both chips are in hardware mode.  I have created my schematic based on the SRC4192 evaluation board  

Question 1

Will a buffered 24.576mhz clock connected to SRC4192 MCKI and PCM5142 SCK work to sync the clocks and provide a 24 bit 96kHz signal?

Question 2

In order to achieve a 24 bit 96kHz signal with an external 24.576mhz clock, should the Serial Port MODE be set as follows:  Mode 2 low Mode 1 high Mode 0 high or Output Port is Master mode with RCKI = 256 fS

Schematic attached

Thank you2275.upsampling.pdf

  • 0
    TI__Expert 5645 points

    Hi Tony,

    below are my comments -

    Q1: You can definitely use the 24.576MHz Xtal for 24-bit/96kHz signal to SRC and DAC. But since you can run the output port on the SRC as MASTER, you will have LRCKO, BCKO and DOUT from the SRC as inputs to the PCM5142. And since the PCM5142 can operate in 3-wire mode, the need for the MASTER CLOCK is eliminated and you can run the DAC w just BCK/LRCK and DIN.

    Q2: YES, you can set the Mode[2:0]=LHH as it configures the output port as MASTER and you will have the LRCK0 and BCKO as outputs to drive the slave (PCM5142).

    Hope this clarifies the questions.

    Best regards,
    Ravi

  • 0 in reply to Ravi Patil
    Prodigy 110 points
    Ravi,
    Thank you for your help and the reminder that the 5142 does not need a clock.