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PGA2505 Datasheet (OPA1632 to A/D Polarity)

Shawn Nageli
Prodigy 180 points
Other Parts Discussed in Thread: PGA2505, OPA1632

Looking at the PGA2505 datasheet, Figure 17.  This shows the connection if using the OPA1632 output buffer before going to the A/D.  If I am not mistaken is the the polarity between the OPA1632 and the A/D reversed?

Shawn

  • 0
    TI__Mastermind 27715 points
    Hello Shawn,

    You are correct. The schematic symbol for the OPA1632 follows the convention from the OPA1632 data sheet of having Vout- on top and Vout+ on bottom, but the ADC symbol has its input pin polarity reversed.

    Unless you prefer to sample an inverted version of your audio signal, I recommend connecting Vout- of the op amp to Vin- of the ADC, and Vout+ of the op amp to Vin+ of the ADC.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Analog - Op Amps