PCM1808: Current capabilities of VREF pin

Damian Wilczyński

Part Number: PCM1808
Other Parts Discussed in Thread: MCP6292, PCM4202, OPA1632

Hello,

It is not clear to me from studying the datasheet and e2e topics related to Vref pin from PCM1808.

I know that Vref pin is not intended to work as an output and it can't be used for virtual ground itself, but can I use that voltage to generate virtual GND using for example MCP6292 to get better noise performance?

Have a good day,

Damian

over 2 years ago

+1 Arthur Brown over 2 years ago

TI__Mastermind 18815 points

Hi Damien,

the Vref pin should only be connected to a decoupling capacitor to GND, or to a high impedance input such as the input of an opamp.

If you want to use Vref as virtual GND I would recommend the part OPA1632. this part is used on the PCM4202 EVM (this part is very similar to PCM1808)

Regards,

Arthur

0 Damian Wilczyński over 2 years ago in reply to Arthur Brown

Intellectual 285 points

Hi Arthur,

Thank you for your quick response, now everything seems clear.

I will use other low noise amplifier because I want stick to SOT23-8 package - recommendations are welcome.

Regards,

Damian

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PCM1808: Current capabilities of VREF pin