MEMS microphones Forum Discussions

Hello!

I'm validating solution to convert IM73A135 diff. output  to single ended signal which is supported only by ADC I used. 

I do not have another ADC option with diff. input, unfortunately.  Another restriction - my application required 1.8V. 

Not so much options for OpAmp selection working with this single ended voltage level. I found only one OpAmp suitable for this solution and asking your help to review this schematics. 

- Is any other OpAmps should work in this circuits? 

- My application is wearable and package SC70-5 so huge and I need two OpAmps, second one used for DC offset 0.9V.

  Is any suitable OpAmps with smaller package size available? 

 Thank you for your help! 

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Is the EVAL AHNB ANALOGV01   mic development board compatible with Ubuntu 22.04 and 20.04 and can i use flex mems mics from a different vendor to use the board. I had recently a problem with the TDK MEMS mic board it was not recognized by the OS.

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I'm looking to use the #IM73D122 MEMS Microphone to decode two ultrasonic FSK signals. They are at 25KHz and 33KHz. My main thought/concern is how much signal processing resource will I need to distinguish the two channels reliably. Has anyone experience of this kind of thing and are there any suitable Infineon dev boards to start looking at this? Any thoughts comments would be much appreciated. Thanks Show Less

Hello,

I am looking for a single-ended analog output microphone with IPxy (e.g., IP57).

For now I have only found the IM70A135V01 with differential output.

This thread:

https://community.infineon.com/t5/MEMS-microphones/IM73A135-Differential-into-single-ended-conversion/td-p/388527

says there should be the IM68A130, but I cannot find anything about ingress protection in the datasheet, so there probably isn't any.

So, should I use the IM70A135V01 in single-ended mode? 
If yes, it would probably be better to connect the unused output to GND with a resistor value about the same as the load on the used output?

Thanks in advance!

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I'm curious if exposing the IM69D130 transducer to ultrasonic frequencies, like those found in ultrasonic cleaners, could cause any damage. Also, should there be any considerations with flux?

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Hi everyone

Regarding the MEMS MIC(IM73A135) Board,  Could you please tell me the restrictions regarding the board thickness? Or could you please tell me the recommended board thickness?

Thanks

u-s

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What is the absolute maximum rating of sound pressure (SPL)?

I am considering the IM72D128V01 or IM69D130 in an environment where it must withstand SPL above 160 dB for longer periods.
I can only find the acoustic overload point in the datasheets, which is not what I am looking for.

I have previously used mems microphones from another brand with severe issues handling high SPL.
The moving mems membrane got stuck to its "floor" due to it's large movement in an event of a high peak.
Back then, the application was not extreme like now, but it destroyed the device permanently.

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The Product Brief for the Microphone flex evaluation kits says that same flex board is used for both analog and digital MEMs microphones.  It states that digital flex boards have a 0.1uF bypass capacitor, but analog flex boards have only the microphone.  I recently purchased a KIT_IM73A135V01_FLEX and confirmed that this is the case.  There is a place on the flex board for an SMD bypass capacitor, but it is not populated for the analog microphones.

What is the reason for leaving the bypass capacitor off of the analog flex boards?  The data sheets recommend one for the analog microphones, same as for the digital.  

It would be difficult to add a bypass capacitor by hand soldering, because of the very tiny SMD size. 

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Hello,

can you say something about the planned product lifetime of the IM72D128V01?

I want to design in the chip in a product with a long lifetime.

So the mic should be available more than 10 years.

Regards

Johannes

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