INA217: Power Supply

May

Part Number: INA217

Hi Team,

Planning to use INA217 as a microphone preamplifier, with an Electret microphone ( WM-61A from Panasonic). Just want to confirm if possible to power supply the INA217 with non-symmetrical 0/9V instead of a symmetrical power supply. and I would like to confirm if this will work good with this kind of microphone?

Thank you.

Regards,
May

over 3 years ago

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Maynard,

the WM-61A is an electret microphone containing a FET buffer not supporting differential signalling but only providing single ended signalling. So there wouldn't be any need to use an instrumentation amplifier. A simple low-noise OPAmp would do.

Kai

0 May over 3 years ago in reply to kai klaas69

TI__Genius 9880 points

Hi Kai,

Just to confirm does INA217 needs a symmetrical power supply?

Thank you.

Regards,
May

0 kai klaas69 over 3 years ago in reply to May

Guru 140200 points

Hi Maynard,

the INA217 can be powered by a single supply:

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/516537/ina217-single-supply

Also see section 10.1 of datasheet.

Kai

0 Raymond Zhang1 over 3 years ago in reply to May

TI__Guru* 77331 points

Hi Maynard,

Yes, you may power the INA217 with asymmetrical or single power supply rails. Please watch for the Vcm and output voltage swings which have certain restraint. Unfortunately, we do not have a simulation model to show you.

If you have additional questions, please let us know.

Best,

Raymond

0 kai klaas69 over 3 years ago in reply to May

Guru 140200 points

And don't forget to properly connect the REF pin of INA217.

Kai

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INA217: Power Supply