PCM6020-Q1: layout guideline issue

Lawrence He

Expert 2830 points

Part Number: PCM6020-Q1

Hi, Support Team

we saw datasheet 11.1

• Use MICBIAS and BSTOUT capacitors with a high voltage rating (> 25V) to support higher voltage MICBIAS operation.

Why asking over 25V? have any concern? basically MICBIAS output voltage is 9V, BSTOUT maybe is 3.3V.

by the way, if no use OUTPUT channel should I floating or connect to GND?

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

5 months ago

0 Sanjay Dixit 5 months ago

TI__Mastermind 23030 points

The BSTOUT pin has a Maximum voltage of MicBias+1v. For MicBias of 9V, the BSTOUT pin has a voltage of 10V.

A capacitor on these pins should have a rating at least of 1.5*Voltage. For 10v on BSTOUT this translates to a 16v rating. This should account for the Tollerance of the capacitors voltage rating

0 Lawrence He 5 months ago in reply to Sanjay Dixit

Expert 2830 points

Hi, Sanjay

by the way, if no use ADC channel count should I floating or connect to GND?

if any, Please advise me.

Thanks,

Best regards,

Lawrence

0 Sanjay Dixit 5 months ago in reply to Lawrence He

TI__Mastermind 23030 points

You can keep unused inputs open.Just disable the unused input in software

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PCM6020-Q1: layout guideline issue