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PCM2704C/PCM2705C I2S SYSCK frequency?

Kim Gavlestam
Prodigy 30 points
Other Parts Discussed in Thread: PCM2705C, PCM2704C

Hi!

What is the frequency of the I2S system clock (pin 18) on PCM2704C/PCM2705C?

Also, are there any recommendations of ferrite bead values and materials to filter the LRCK, BCK, SYSCK and DATA lines?

Thanks!

/Kim Gavlestam

  • 0
    TI__Guru 57800 points

    Hi, Kim, 

    I have asked my colleague to help you with your questions. He will get back to you soon.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0
    TI__Guru** 110615 points
    Hi Kim,

    Regarding the system clock frequency, this is 256*fs, this information is shown in Figure 1 on page 12 of the PCM270xC datasheet.
    Usually it is recommended to use low value resistors in series for each I2S bus lines, around 22-Ohm. These resistor values must not be too high as it could generate a low pass filter with the system capacitance and this could lead to signal quality loss.

    Best regards,
    -Ivan Salazar
    Texas Instruments