WM7132
Preliminary Technical Data
CONNECTION TO A WOLFSON AUDIO CODEC
Wolfson provides a range of audio CODECs incorporating an analogue microphone input interface;
these support connection to silicon microphones such as the WM7132.
The recommended connection of a WM7132 silicon microphone to the WM8994 is illustrated in
Figure 2 (for single-ended mode) and Figure 3 (for pseudo-differential mode).
A DC blocking capacitor is required, as described in the previous section. A 1µF decoupling capacitor
is also recommended; this should be positioned close to the VDD pin of the WM7132.
Further information on the WM8994 is provided in the product datasheet, which is available from the
Wolfson website. The equivalent connections can be made to other Wolfson devices in a similar
manner.
Figure 2 WM7132 Silicon Microphone Single-ended Connection to WM8994
Figure 3 WM7132 Silicon Microphone Pseudo-differential Connection to WM8994
PTD, Rev 2.0, October 2012
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
