PCM1753: Parallel connection

Yuta Nishie

Genius 3655 points

Part Number: PCM1753
Other Parts Discussed in Thread: PCM1863

Hi,

Is it possible to connect multiple PCM1753s in parallel and use them?

Best Regards,

Nishie

over 3 years ago

0 Paul_Frost over 3 years ago

TI__Guru 53503 points

Hi Nishie-san,

Do you mean connect the digital I2S inputs together? The digital SPI inputs together? Or short the ANALOG outputs together?

Most the answers are yes. There is no issue with sharing the digital I2S and SPI lines. For the analog outputs, there could be some small offset between them that will cause additional current load floating between the devices. I recommend that if you were to short the outputs together, you do so after an RC filter, to both limit the current and filter noise.

Thanks,

Paul

0 Yuta Nishie over 3 years ago in reply to Paul_Frost

Genius 3655 points

Hi Paul-san,

Thank you for your reply.

I am thinking of a connection method similar to the following topics. (PCM1863 replaces PCM1753)

https://e2e.ti.com/support/audio-group/audio/f/audio-forum/1003867/pcm1863-parallel-connection

When connecting in parallel on I2S, is it correct to recognize that the pins used are BCK and LRCK, DATA?

Best Regards,

Nishie

+1 Paul_Frost over 3 years ago in reply to Yuta Nishie

TI__Guru 53503 points

Hi Nishie-san,

The SPI pins can be shared, but you would still want to have separate ML pins for each device if you want to address them individually. If you are writing the same configuration to both devices then the pins can be shared.

The I2S inputs would be SCK, BCK, LRCK, and DATA.

Thanks,

Paul

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PCM1753: Parallel connection