OPA1692: The application of OPA1692D in MIC pre-amplifier circuit

Wenting Wu

Part Number: OPA1692

Hello sir,

May I ask whether OPA1692D is the good selection for MIC pre-amplifier circuit or not? If not, which one is recommended?

The production is platform microphone system with the features:

Power supply is 60W, built-in charging battery.
OPAMP is supplied by a single power supply from 12V to 15V.
Adding optional wireless block

Are there some applications notes/ reference design to talk about MIC pre-amplifier circuits or amplifiers' selections?

over 5 years ago

0 Andy Peters over 5 years ago

Genius 3945 points

What kind of microphone? Professional type (like a Shure SM58 dynamic) with balanced low-Z output on XLR? Or an electret mic?

0 Tamara M Alani over 5 years ago

TI__Genius 10850 points

Hello Wenting,

Absolutely! The OPA1692 datasheet has an example of a preamplifier for a 3-wire electret microphone. Please refer to page 24 of the datasheet for an explanation of this: http://www.ti.com/lit/ds/symlink/opa1692.pdf

We also have some other collateral for preamplfiier design which you may follow:

Phantom power with operational amplifiers: http://www.ti.com/lit/an/sboa320a/sboa320a.pdf
Single supply, electret microphone preamplifier reference design: http://www.ti.com/tool/TIPD181

We also have a designated page for audio collateral, please see it here: https://e2e.ti.com/support/amplifiers/f/14/t/798464

-Tamara

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OPA1692: The application of OPA1692D in MIC pre-amplifier circuit