OPA2376: Is this the best replacement for LMV821

John Albrecht

Part Number: OPA2376
Other Parts Discussed in Thread: OPA1611, OPA1612, OPA397, OPA376

Hello, I am currently using the LMV821 as a microphone Preamp but it has a noisy output. I was looking into a fully differential opamp or a low noise opamp as potential solutions. The best option I found is the OPA2376 audio amp. My application requires the same or better specs than the LMV821, would you be able to tell me if I chose a great replacement or if TI has a better device?

I really appreciate the help with this question.

over 1 year ago

0 Raymond Zhang1 over 1 year ago

TI__Mastermind 48006 points

Hi John,

Enclosed is a list of audio amplifiers and we have plenty to choose from. OPA1611/OPA1612 could be a good one, depending on the design requirements. Any of these will replace LMV821.

https://www.ti.com/amplifier-circuit/op-amps/audio/overview.html?keyMatch=AUDIO%20AMPLIFIER

If you have additional questions, please let us know.

Best,

Raymond

0 Marek Lis over 1 year ago

TI__Guru 60610 points

LMV821 is noisy most likely because it uses bipolar input transistors with its high input current noise getting converted across the input impedance into voltage noise. OPA376 is a good alternative BUT I think OPA397 would give customer best results because of its lowest IB.

0 John Albrecht over 1 year ago in reply to Marek Lis

TI__Prodigy 260 points

Thank you for taking the time to explain why the LMV821 is noisy. I will look more into the OPA397.

0 John Albrecht over 1 year ago in reply to Raymond Zhang1

TI__Prodigy 260 points

Thank you for the list of amps that would be good for this application. I will review them and see which fits best in this application.

0 Raymond Zhang1 over 1 year ago in reply to John Albrecht

TI__Mastermind 48006 points

Hi John,

I am going to close this inquiry for now. If you have additional questions, please let us know.

Best,

Raymond

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OPA2376: Is this the best replacement for LMV821