ADV7627 MCLK Frequency setting problem.

Dear Sir :

There were some problems with the MCLK output when we used the ADV7627 to design.

Description 1. When the HDMI IN and the HDMI output connected.

                       The state is 1 (locked) of AUDO_PLL_LOCKED.==>And the MCLK measurement is 6.144MHz.(128 fs)

Description 2. When the HDMI IN connected and the HDMI output not connected to the Cable.

                       The status is 0 (not locked) of AUDIO_PLL_LOCKED.==>At this time, the MCLK measurement is 40.5MHz. (generated internally)

For the case of Description 2, can we change or turn off the frequency of MCLK?

Hub Chang.

  • Hi,

     For the case of Description 2, can we change or turn off the frequency of MCLK?

      As per recommendation is to tristate the audio pins until there is audio.

    Please let us know,if HDMI input has as connected,then how the audio Pll has not locked ?

    And also your audio input sampling frequency.

    Do you one of our evaluation board?

    Thanks,

    Poornima