SmartSound™ MEMS Microphones

Hi,
I have a question regarding the INMP441 audio output through the I2S.
1. Basically I want to know what is the max data rate we can expect?
2. Is the audio output of PCM format, or is there a codec which does further compression? If there is a codec, can we get the source code of the codec?

thanks and regards,
Rajkumar

Hello.
You can see on the picture the two output of ICS. Supply is a battery (3V) with shorts wires connected to ground and VCC directly on package with 470nF decoupling capacitor. Connections to oscilloscope probe touching the pads : 1 Mohms, without any wire. Datasheet explain this Mic can be used in single ended mode. It is not possible with this spurious at 26 Khz. I confirm the result on many parts same ref. Could you confirm?
Regards.

Hello,

I read about the ultrasonic capabilities of the ICS-41352 and would like to ask the following questions regarding this chip:

Hi All,

I have just found out about the AN-000094 – TDM Microphone Array Demo Board
Would any one please help to guide on how to use it?
Can this boar work with Raspberry Pi?
Any SDK available for the board pls?

Thank you very much for your help and reply

What is the minimum load impedance spec for the ICS-40618?

Hi,
Can anyone guide me how to use PDM mic with Raspberry Pi using Python programming

I am using the MPU6050 accelerometer, CC1310 chip control. At present, only the accelerometer low power mode is used, and the acceleration data is read once in 5 seconds, and the acceleration value is calculated. Now using two modules, there is a deviation in the read data. When one of the poses is different, the data read is different. When the pose is the same, the data read by the other module is close to 10 times. The data read is always changing. Have you encountered the same problem? Or how to solve this problem?

Hello
We are using ICS43432 microphone to make some audio measures.
We use an external source to calibrate the microphone (94dB 1kHz).
The I2S sampling rate is 32kHz
I join the FFT to the topic.
As you can see, we have 1kHz harmonics.

When we use 44.1kHz, these harmonics disappear.
As soon as we don't use a frequency not multiple of 44.1, we see this kind of harmonics appearing.
Looking at the audio waveform, it seems the microphone makes some downsampling or oversampling.
Is it a known case?
Thanks for your help

I am testing the ICS-40618 Analog MEMS Microphone and I am testing with the EV_ICS‐40618‐FX Evaluation Module. I have two different power supplies, both have isolated outputs. When I connected one supply (PS1) and input a 16KHz sound wave to the microphone, the output from the microphone is as expected and clean (See attachment SDS00010.jpg). When I connect to the other power supply (PS2), and input the same 16KHz wave to the microphone, the output is attenuated and distorted (See attachment SDS00011.jpg).

In my application (a microphone coupled to a reflector dish to focus the sound) I would like to minimize the sound from the sides (off-axis) of the dish. The Invensys MEMS microphones are omnidirectional?

Another microphone company vents both sides of the microphone diaphragm in their noise reducing designs so that the ambient noise works on both sides of the diaphragm. The louder direct path sound is concentrated more on one side. These microphones are directionally sensitive. Is there a similar Invensense product?