PCM5102A: Is there any issue if fs is changed while LRCK/BCK keep working and SCK output constant freq?

Koyo Asaishi

Intellectual 1980 points

Part Number: PCM5102A

Hello team,

Let me ask one question.

Can PCM5102A allow to change fs during constant frequency of SCK without stopping LRCK and BCK?

Best regards,
Koyo

over 4 years ago

0 Paul_Frost over 4 years ago

TI__Guru 54043 points

Hi Koyo-san,

When the SCK changes, the device will detect a clock error and go to a soft mute state. Once the LRCK/SCK ratio is valid again, it will unmute. This should not cause a pop noise or anything, just a simple volume ramp down then ramp up. It should not be a problem.

Thanks,

Paul

0 Koyo Asaishi over 4 years ago in reply to Paul_Frost

TI__Intellectual 1980 points

Hi Paul,

My question is SCK, LRCK and BCK are not changed but only fs is changed.
In this case, is there any issue?

Best regards,
Koyo

0 Koyo Asaishi over 4 years ago in reply to Koyo Asaishi

TI__Intellectual 1980 points

Hello Paul,

I'm sorry to rush you but customer need an answer by today.

Your answer is when SCK is changed but my question is when fs is changed.

Best regards,
Koyo

0 Paul_Frost over 4 years ago in reply to Koyo Asaishi

TI__Guru 54043 points

Hi Koyo-san,

When the LRCK clock changes there will likely be a synchronization error (clock error). This will result in the same mute state until the clocks can re-synchronize. It should not generate any pop noise.

Thanks,

Paul

0 Koyo Asaishi over 4 years ago in reply to Paul_Frost

TI__Intellectual 1980 points

Hi Paul,

Thank, it was my misunderstanding.

But let me ask, can I understand SCK=LRCK or BCK?
Sometimes MCK is represented as SCK so I want to make sure.
MCK is fixed in this case.

Best regards,
Koyo

0 Paul_Frost over 4 years ago in reply to Koyo Asaishi

TI__Guru 54043 points

I have seen SCK used for multiple clock names in the past. In this case I used:

LRCK = fS = sample clock (e.g. 48kHz)

BCK (bit clock) = fS×64

SCK=MCK= system clock = fS×128 or fS×256 or fS×512, etc.

Thanks,

paul

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PCM5102A: Is there any issue if fs is changed while LRCK/BCK keep working and SCK output constant freq?