PCM1754: ZEROA termination

Kazuki Itoh

Genius 9565 points

Part Number: PCM1754
Other Parts Discussed in Thread: PCM1755

Hi team,

In the thread below, it is mentioned that ZEROA is not open-drain in PCM1754.

https://e2e.ti.com/support/audio-group/audio/f/audio-forum/871284/pcm1754-q1-zeroa-pin

Is the external pull-up resistor needed for the ZEROA pin?

If so, what is the recommended pull-up voltage and resistance value?

Regards,

Itoh

over 2 years ago

0 Carson Allen over 2 years ago

TI__Genius 13610 points

Hello,

Thanks for reaching out to us.

Due to Thanksgiving Holiday our experts are currently out of office until Monday 11/29 where they will be happy to assist you then. We thank you for your patience.

Best Regards

Carson

LPA Applications Engineer

+1 Arash Loloee over 2 years ago

TI__Mastermind 21660 points

Hello Sir,

Datasheet mentions (page 3) that ZEROA pin is Open-drain output for PCM1755 and not for PCM1754. So you do not need any pullup for this pin for PCM1754 as the output is a logic high or low accordingly.

Regards,

Arash

0 Kazuki Itoh over 2 years ago in reply to Arash Loloee

TI__Genius 9565 points

Hi Arash-san,

I don't think the page3 ZEROA output type of PCM1754 is enough clear. But anyway I understand that I don't need the PU resistor.

Regards,

Itoh

0 Arash Loloee over 2 years ago in reply to Kazuki Itoh

TI__Mastermind 21660 points

Yes, sometimes data sheets are not clear and straight forward.

Regards,

Arash

Audio

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PCM1754: ZEROA termination