Preliminary Technical Data

WM7121

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PTD, Rev 2.0, October 2012

9

MATCHED MICROPHONE PAIRS

WM7121 and WM7132 are sensitivity matched microphone pairs. The enhanced versions,

WM7121E and WM7132E have tight tolerance of ±1dB and compatible output performance.

These microphones are ideal for accurate sound pickup from opposite directions in slim

profile applications.

WM7132E should be positioned close to WM7121E on the same side of the PCB to maximise

acoustic matching for effective DSP application.

The WM7121 and WM7132 also have matched frequency response at both high and low

frequencies, allowing simplified system design.

RECOMMENDED PCB LAND PATTERNS

1.70 mm

Ø0.8 mm

Figure 4 Recommended Customer PCB Land Pattern

(Note that all other dimensions can be obtained from the package dimensions)