Can ADAU-1452 Input and output running at the PCM audio format?

Davids Question

Jul 30, 2020 00:00

Hi,

I am trying to design one pre-amp with ADAU1452,

but the DAC which I choose is using PCM format to input.

As other project, I always use I2S input and output, so I am not really familiar how to set PCM as the DSP output.

Any guide for this? cause I search the datasheet, it said that the 1452 can support the PCM format for in/output.

Thanks!

BR.

Alvis

Audio Signal Processors

adau1452

pcm

i2s

sigmastudio

SigmaDSP Audio Processors

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Davids Reply

Aug 2, 2020 00:00

Hello here,

Can anyone help me the question?

many thanks!

BR,

Alvis

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ADIApproved Reply

Aug 5, 2020 00:00

Hi Alvis,

SigmaDSP uses PCM to encode audio data. PCM describes encoding, but not a communications protocol.

I2S, LJ, and TDM are some of the communications protocols SigmaDSP can use to transport PCM.

We can provide more information if you tell us the DAC you are using.

Regards,

Joshua

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Davids Reply

Aug 11, 2020 00:00

Hello Joshua,

Thank you for your reply!

The DAC which I am using is WolfSon WM8741

Sorry for the late reply!

Thank you!

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ADIApproved Reply

Aug 11, 2020 00:00

Hi Alvis,

I took a (very) quick look at the datasheet. The following is from Page 22:

The "PCM" interface is named PCM simply because it describes PCM-coded data. At the physical layer, the WM8741 accepts the encodings LJ, RJ, I2S, DSP mode A, or DSP mode B.

LJ or I2S are the best combination with ADAU1452. It looks like there are some limitations within the WM8741 when RJ is selected (32-bit data is not supported).

Let me know if this makes sense.

Regards,

Joshua

PS, I haven't taken the time to compare the timing specifications- I'll leave that to you.

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Davids Reply

Aug 11, 2020 00:00

Hi Joshua,

Thank you very much! That is very clearly answer for my question!

This information help me a lot. Sorry for my mistake, I didn't notice that information in datasheet.

Regards,

Alvis

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