I have a board where ADMP421 is used. We did a rework (using hot air) and noticed the following behaviour:
+3V3 - is present and correct
GND as well.
L/R - is low
CLK input is 2.048MHz
Data out is present. (See captured image below)
Problem is : there is no any sound coming from do microphone.\
Other board is working correctly
Question - How to check if microphone (the membrane) is not destroyed ?
Thanks in advance.
Analog Devices no longer sells or supports MEMS microphones. If you have specific questions about microphones, please post them to the InvenSense forums (link below).
For more details, please read this message posted a few weeks ago on the Audio forum:
As of November 1, 2013, Analog Devices’ MEMS microphone product line has been sold to InvenSense. InvenSense will take over all sales and support of these microphone products. Going forward, all technical support questions should be directed to InvenSense’s Developers Corner. All existing MEMS microphone discussions on EngineerZone will remain on the forum and the Audio forum will continue to support questions regarding the use of microphones with ADI products.
by JeradL (October 31, 2013)
Thank you Brett.
Discussion can be closed then.