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INA188: INA188 for XLR Mic input preamp

Terry Wu
Expert 1680 points
Part Number: INA188
Other Parts Discussed in Thread: INA826, OPA1632, OPA1642, OPA1678, OPA1602, DRV134, DRV135

Hello Experts,

We want to design a XLR input mic preamp , gain up to 40dB ~50 dB . Gain setting by different resistors.

Will INA188 suit for this application ? Or is there other options ?

We would like to convert single-end input to differential input for higher SNR .  Is there suggest OP for SE to DIFF output ?

Finally, we care about this amplifier circuit SNR under -60 dB  . Firstly we will use Audio Precision to test circuit.

But can we use  simulation tool ex: TINA to simulate it ? 

Many thanks a lot ~

  • 0
    TI__Genius 13240 points
    Hi Terry,

    I think the INA188 would work for this application. Another option to consider would be the INA826, which would give better CMRR performance at higher frequencies, though the INA826 is slightly noisier (18nV/rtHz typical and .52µVpp .1-10Hz at G=100, vs. 12.5nV/rtHz and .25µVpp for the INA188).

    For single-ended to differential conversion, the best solution would depend on available power supplies and the input source to the single-ended to differential converter. Without that information, I'd consider an OPA1678, OPA1602, or OPA1642 for a discrete implementation. Other options would be the DRV134/DRV135 line driver or OPA1632 fully-differential amplifier.

    For noise simulations, most of our models do model noise correctly. If you are concerned about a particular device's model, the simulated parameters are usually listed in the macromodel, or in the TINA reference design for the part in question.