Hi!
Does anyone have any information about where or how to find the input impedance of the HMIC pins for the TWL6040 in the datasheet?
I will be using a MEMS analog microphone (ADMP401: http://www.analog.com/static/imported-files/data_sheets/ADMP401.pdf) to provide the analog signal to the TWL6040, but in order to find the capacitance value for the capacitor placed between the devices on the analog signal circuit, the input impedance of the TWL640 HMIC needs to be known.
Of course, there is a minimum capacitance value that can be used, but I'd like to match the capacitance to the impedance...
Thanks for your help in advance!
James