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OPA627: As a difference amplifier in PCM1794A based Headphone amp/DAC

David Gash
Prodigy 30 points
Part Number: OPA627
Other Parts Discussed in Thread: OPA1644, BUF634, , PCM1792A, OPA1622, OPA1612, OPA1688

I was interested in using the OPA627 (and maybe a BUF634) as the output stage of my DAC/headphone amp.  I plan on using the OPA1644 as the Trans-impedance amplifier to convert the current  from the PCM1792A DAC to a differential voltage this signal into a single OPA627 (one each for left and right) configured as a difference amplifier with a gain of 1 to convert the signal to a signal ended signal to drive a pair of headphones (50 ohms to 600 ohms). 

  • 0
    TI__Expert 6250 points
    David,
    While the OPA627 will certainly work in this application, you might also want to consider the OPA1612, OPA1622, or OPA1688 for the headphone driver. All three have excellent THD+N specs even into 32 ohm loads, and match or exceed the OPA627's THD+N at 600 ohms. The OPA1622 is probably the best suited to this application, but is only avaliable in a VSON package, while the other two are available in SOIC.