I was able to record the PDM from the IM69D130 I am wondering does infineon provide the a reference coefficient for the decimation filter? I am unable to get the noise floor to match of the EVAL AHNB IM69D130V01. What filter was used to make the acoustic specification in data sheet? How can I meet that specification? what filter design approach was used?

Hello

Please let me confirm the meaning of  "component level IP57" on IM72D128 data sheet.

I am concerned about  Water and Dust comes from Sound Port  through PCB hole to  IM72D128.

( Please see attached )

If it was  Okay, it is very good for out-door surveillance camera. 

Please advise.

According to the data sheet, the IM73D122V01 has a frequency range extending out to 80KHz in the Ultrasonic mode. If I'm using the microphone in the "Low Power Mode" (eg. 666KHz clock in my case) - will a loud ultrasonic tone (eg. ~40KHz) alias into the normal audio range?

I'm hoping/assuming there is some sort of Low Pass filtering based on the microphone mode/clock. I have a product idea that will be mainly interested in tones less than 2000Hz for most of the time, but the "Ultrasonic Mode" could be useful for providing some other features  too. Assuming there is a LPF in the "Low Power Mode", what would be the cut-off frequency for 666KHz? If there is application note or paper that describes how the filtering works in different modes and clock frequencies please let me know.

Thanks.

What guidance or design examples are recommended for implementing sound level measurement with Infineon's MEMS microphones?

I did find an example for PSoC 6, that implies an Audio CODEC is required to convert microphone sensor data to meaningful information, "CY8CKIT-028-sense Audio Examples for Analog Mic" @ https://community.infineon.com/t5/PSoC-6/CY8CKIT-028-sense-Audio-Examples-for-Analog-Mic/td-p/322152

Would Infineon recommend a PSoC 6, CODEC, Microphone combination for the basis of an Accurate Sound Level Measurement device?

An Accurate Meaurement Solution would likely need some form of calibration. Would calibration need to be dynamic for changing environmental conditions?

Greg

1. 1. 客户有新项目要用到附件这款差分的数字硅麦，看到规格书上面有个推荐电路的接法，请问一下图中红色框的这种接法是出于什么目的？

     2.请帮忙确认一下，游戏耳机的咪杆上用两颗这种差分硅麦的原理图绘制是否是这样的？两颗硅麦共用电源和地。

We made new mems microphone package based on Infineon MEMS and ASIC.

we tried to calibration this package. however, to start calibration,when the package is applied bias voltage, the initial sensitivity of Mems microphone is slightly increasing from -47.2dB to -46.9dB, it took about 10sec and it settled a stable senstivity value. About 0.3dB variation occured, a certain package has a 0.6dB variation. What kinds of causes can make this problem? SNR is OK. THD is OK. Freq. response is OK.AOP is OK. But even after calibration, this phenomenon still happen.

Could you recommend any solution and the theoretical explanations for this issue?

I really appreciate if I get the answer from here.

Thanks.