PCM9211: Programming

Thank you Diego

Hi Diego,

Does it mean the PCM9211 can convert the S/PDIF input to a PCM with 16KHz sampling rate at the I2S/PCM output port (LRCK, SCKO, BCK, DOUT)?

BR

Matthew Lam

Hi Diego,

Moreover, does the PCM9211 have the volume control for the S/PDIF signals?

Also,  when reading the data sheet we cannot see that the TI has the ability to do a re-sampling internally to 16kHz. When just using the ADC as signal input, we believe that the PCM output can run on 16kHz. 

But when the SPDIF Input is used, the clock of the DIR and the rest of the whole internal audio path seems to be derived directly from the SPDIF signal clock, which can be up to 216KHz. If the PCM9211 can do a re-sampling and reduce this sampling rate down to 16kHz, also the Main Output Port could provide this 16kHz as we request it. When looking at the block diagram in the data sheet, we just cannot see any re-sampling unit that could do this.

Can you please to check if the Main Output Port PCM clock frequency can be fix defined to 16kHz (in Master or Slave mode) independently what clock frequency the SPDIF input signal delivers by doing a re-sampling?

Thanks.

BR
Matthew Lam

Hi Diego,

Sorry, here is more detail about our question,

When reading the data sheet, we cannot see that the PCM9211 has the ability to do a re-sampling internally to 16kHz.

When just using the ADC as signal input, we believe that the PCM output can run on 16kHz. But when the SPDIF Input is used, the clock of the DIR and the rest of the whole internal audio path seems to be derived directly from the SPDIF signal clock, which can be up to 216KHz.

If the PCM9211 can do a re-sampling and reduce this sampling rate down to 16kHz, also the Main Output Port could provide this 16kHz as we request it. When looking at the block diagram in the data sheet, we just cannot see any re-sampling unit that could do this.

Could you check and confirm if the Main Output Port PCM clock frequency can be fix defined to 16kHz (in Master or Slave mode) independently what clock frequency the SPDIF input signal delivers by doing a re-sampling?

Thanks.
BR
Matthew

Hi, Matthew,

First  of all, Welcome to E2E, Thanks for your interest in our products!.

Your comments are correct, this device supports 16KHz PCM output, but this sampling rate is not configured or re-sampled internally, it is derived from the S/PDIF source clock, or ADC configuration.

Best Regards,

  -Diego Meléndez López
   Audio Applications Engineer

HI Diego,

Thanks for the reply. So, can the S/PDIF generate the 16KHz sampling? How?

BR

Matthew

Hi, Matthew,

In S/PDIF protocol, the sampling rate is extracted form the signal itself, so the 16KHz sampling rate should be provided from the S/PDIF source device.

Best Regards,

  -Diego Meléndez López
   Audio Applications Engineer