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OPA1632: DC Input for OPA1632

Audio Designer
Prodigy 70 points
Part Number: OPA1632
Other Parts Discussed in Thread: PCM1804,

Hello,

I would like to use the OPA1632 to drive a high Performance ADC PCM1804. Referring to the datasheet of the OPA1632 page 13, the signal Inputs 8 and 1 of the OPA1632 are not on the DC-Level Vcom, right?

If I want to get them there, one possibility would be to use a big capacitor for AC coupling in series with R1, R2. Is it alternatively possible to go with a symmetrical Input signal to R1, R2, which is allready on DC-potential VCOM? This would mean no DC current is flowing out of OPA1632 and through the resistors R1,R2.

Some comments on that would help a lot.

Thanks in advance

  • 0
    TI__Genius 15975 points

    Hi,

    Yes, the signal inputs 8 and 1 of the OPA1632 are not on the Vocm DC-level. And yes, it is alternatively possible to go with a symmetrical input signal to R1,R2 which is on the same DC-level as Vocm. As you have noted, there would be no DC current flowing out of the OPA1632 and through the R1,R2 resistors.

    Best Regards,

    Rohit