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MEMS microphones Forum Discussions

senSR
Level 1
Level 1
First reply posted First question asked Welcome!

Hello,

I am designing a battery-powered product which supports a supply voltage from 1.8V up to 3.6V.

For the majority of time, the battery voltage will be between 1.8V to 2.4V depending on the temperature.
(At 25°C the voltage is 2.2V, this will be the temperature of 80% of the product's applications.)

Coincidentally, this is exactly the voltage range which is not specified in the datasheet of the IM73A135.

1. What mode will the IM73A135 be in when connected to this changing(temperature) 1.8V - 2.4V supply voltage?
2. What is the voltage threshold for the modes to get switched?
3. Will it keep repeatedly switching between modes rendering the microphone non-functional?
4. Is the mode switch transition audible and/or noticeable in the microphone output signal, or is it seamless?

Thank you for any help that you can provide.

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1 Solution
GeorgeT
Moderator
Moderator
Moderator
50 solutions authored 25 likes received 5 likes given

Hi @senSR,

Please note that VDD level should be in either of the voltage levels specified for both the modes.

When the microphone VDD is in the voltage levels between two operating modes, the performance is not guaranteed.  So, it is recommended to use level shifters to keep the VDD range required for either of the operating modes.

Thanks and regards,

George

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GeorgeT
Moderator
Moderator
Moderator
50 solutions authored 25 likes received 5 likes given

Hi @senSR,

Please note that VDD level should be in either of the voltage levels specified for both the modes.

When the microphone VDD is in the voltage levels between two operating modes, the performance is not guaranteed.  So, it is recommended to use level shifters to keep the VDD range required for either of the operating modes.

Thanks and regards,

George

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