• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 30 subscribers
  • Views 578 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PCM5101A: about sampling frequency

ACGUY
Guru 11170 points

Part Number: PCM5101A
Other Parts Discussed in Thread: PCM5122, PCM5102EVM-U

Hello E2E,

I looked the table10 of datasheet.
Does this device able to set the sampling frequency at 125-kHz?

Regards,
ACGUY

  • 0
    TI__Guru 56043 points

    Hi ACGUY,

    The device will try to auto detect is input clocks and auto configure its clock tree.  The device's auto configuration assumes clocks in >1x, 1x, 2x, 4x and 8x multiples of 44.1kHz and 48kHz.  As 125kHz is between groups of common frequencies, it might not resolve to the most ideal clock tree settings, which can result in degraded performance. 

    Instead, I recommend you look at the PCM5122.  This device has an SPI/I2C interface that allows the user to manually configure the clock tree, which let's it support many more input sample rates.

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    Guru 11170 points

    Hi Paul,

    Thank you for reply.

    >> which can result in degraded performance. 

    Currently, we trying the PCM5102EVM-U (changed 5102 to 5101).
    Input signal : 1kHz, 0dBFS
    Fs : 125kHz or 375kHz
    The EVM does not output.

    Am I making a mistake in the procedure?
    Or is it the performance of the device?

    Regards,
    ACGUY

  • 0 in reply to ACGUY
    TI__Guru 56043 points

    Hi ACGUY,

    What are frequencies are you using for the other signals?

    SCK=?

    BKC=?

    LRCK = 125kHz

    What format are you using for the data?

  • 0 in reply to Paul_Frost
    Guru 11170 points

    Hi Paul,

    The situation has changed, so I'll change the question.
    The analog output from the device has been realized. However, signal aliasing is added to the output frequency characteristics.
    Is this because the input to the device is different from the recommended value?

    Regards,
    ACGUY

  • 0 in reply to ACGUY
    TI__Guru 56043 points

    What signals are you seeing? This device does generate out-of-band noise.