Hello,

I would like to use the IM73A135 analog MEMS microphone in a single-ended configuration.

I suppose that in order to implement this, I should either:
1. Use only one of the differential outputs, but which one?
2. Convert the two differential outputs into a single ended signal using an op-amp, but how does this circuit look like?

Considering the datasheet only mentions the characteristics when used in a differential configuration, I wonder how they change if I chose the first option - to only use one of the differential outputs.
Will the SNR and sensitivity change, or will they stay the same?

The second option of converting the differential signal into a single ended signal using an op-amp circuit intuitively seems like the "more correct" idea. Both the SNR and sensitivity should inherently remain the same, right?

The goal is to replace the single-ended microphone in our circuit with the IM73A135 because of it's higher SNR.
This is our original TI TLV342S op-amp circuit, ideally there is a way to convert it to support a differential input.

If you know about anything that might help, please let me know.

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.

Dear Comunity,

I wanted to know does MEMS microphones has a future/capacity for using them on wooden instruments on stage. Or even professional studio recordings. 

Thank you for your answers.

Uyg.

Hi Infineon

The customer asked about the digital microphone with I2S interface for Infineon solution, Do Infineon have such a product？ They don't want a PDM to I2S converter chip

Hi,

I'm designing a small cylindrical microphone pod, using an IM69D130 mems digital mic soldered on a small pcb.
The pcb is located on one side of the pod, with the mic hole externally exposed.
On the other side I need to fill the pod with an epoxy resin, to obtain the desired shape.

Is there some kind of shortcoming doing this?
Can the resin change the mic behavior?

Many thanks,

Marco

It's my first time in the community, and I bought a KIT IM73A135V01 Flex.
There is no manual for this product anywhere, so I don't know how to use it. In particular, it is too difficult to find manuals for other kinds of MEMS microphone trial products.

I bought KIT IM73A130V01 FLEX a while ago, but unlike other competitors, it seems that the description of the trial version is insufficient for non-professionals to use this product.

Hi,

in IM69D130 datasheet, at "3.1 Absolute maximum ratings" section, the Ambient (operating) Temperature is a bit confusing.
There are 2 different rows reported, as shown in the image below:

Does it means that this microphone is not classified as Industrial?
It seems a little strange, since other IM-family mems microphones (like IM72D128) are -40 / +85 °C.
Can somebody clarify this?

Best regards,
Marco

Hi,

I would like to test microphones from another manufacturer with the AudioHub Nano, e.g. TDK InvenSense EV_ICS-41350-FX (https://www.digikey.de/en/products/detail/tdk-invensense/EV-ICS-41350-FX/6140309).

I managed to test one mic at a time and get a good quality with it, but don't get a stereo signal in a two-mic configuration to work, just noise in both channels. The TDK InvenSense uses a SELECT pin to be connected to GND for the left channel, and to be connected to VDD for the right channel. If I use the SELECT pin like that or just don't use it, the outcome is the same.

I noticed that the Infineon mics don't use the SELECT pin, is that correct? Any ideas how to connect the new mics to the hub?

您好，我在使用麦克风IM69D130的过程中，出现了一个问题，麦克风IM69D130在刚开始使用过程中的声音是很干净的，但在放置了一段时间（两个月）后，它的噪声就变得很明显，尤其是在周围无明显声音的情况，噪声频率大概是在30HZ到100HZ左右。我想知道出现这个问题的原因最有可能是什么。谢谢