PCM1809: Regarding MD Pin Handling

Hi Ryu-san,

We will have an expert respond soon.

Best,

Garret

Hi Garret,

When can I expect a reply?

Best Regards,
Ryu.

Hi Yamashita-san,

Apologies for the delay.

This is typically a concern with floating input pins. Especially if the noise can cause false 0-1 or 1-0 toggling internally. Hence it is better to keep the unused MD1 pin pulled down to GND.

Thanks and Regards,

Lakshmi Narasimhan

Hi Lakshmi-san,

Thank you for your reply.
I'm not concerned about noise-induced fluctuations on the MD pin; I want to confirm whether there is any possibility of the MD pin affecting the audio signal.

Best Regards,
Ryu.

Hi Lakshmi-san,

Could you please reply?
I'm processing the MD pin as open and just want to confirm it won't affect the audio signal.

Best Regards,
Ryu.

Hi Yamashita-san,

Lakshmi is out of office, so please allow some time for his response.

In the meantime, I think it is best to follow his recommendation to GND the unused MD pin. It should be internally isolated from the analog circuitry, but is involved in the clocking circuitry so toggling from floating should be avoided. 

Best,

Garret

Hi Garret-san,

Thank you for your reply.
Is Lakshmi-san still unavailable?
I look forward to your response.

Best Regards,
Ryu.