WEBENCH® Tools/DIR9001: brief noise occur when stop or start playing music.

jerrylq

Part Number: DIR9001
Other Parts Discussed in Thread: PCM1794

Tool/software: WEBENCH® Design Tools

Hi support,

I use dir9001 and pcm1794 and tpa6120 on my board and it seems all ok, but a brief noise will appear when start or stop playing,

If use oscilloscope to abserve the pin 27(error) of dir9001, will find the level will be high to low or low to high respectively.

I allready try to connect the pin 27 of dir9001 or pin 13 of pcm1794 to the mute pin 10 of pcm 1794, to aviod this noise , but no effect.

could you please give to me some advice for this issue. thanks a lot!

over 3 years ago

0 Aaron Estrada over 3 years ago

TI__Mastermind 22950 points

Hello,

Apologies for the delayed response. Let me look though the provided schematic and I will get back to you in a couple of days.

Regards,

Aaron

0 jerrylq over 3 years ago in reply to Aaron Estrada

Prodigy 30 points

Thank you for your reply.

0 Zak Kaye over 3 years ago in reply to jerrylq

TI__Mastermind 23050 points

Hi,

I think the noise you are hearing may be caused from shorting the ERROR pin to the CKSEL pin as there may be a discontinuity in the clocks and data while the device switches from the PLL clock recovered from the input data to the XTI source. It sounds like this switch happens faster than the PCM1794 is able to mute its output since it presumably depends on the audio clock edges for muting. Can you remove the connection between CKSEL and ERROR, tie the CKSEL pin low, and connect the ERROR pin to MUTE to see if this resolves your issue?

Best,

Zak

0 jerrylq over 3 years ago in reply to Zak Kaye

Prodigy 30 points

Thank you for your reply, pcb connect with cksel pin will follow your advice, thanks again.

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WEBENCH® Tools/DIR9001: brief noise occur when stop or start playing music.