FAN3850A Datasheet, PDF (9/11 Pages) Fairchild Semiconductor – Microphone Pre-Amplifier with Digital Output

Applications Information (Continued)
Electret
INPUT
Diaphragm
Airgap
Backplate
FAN3850A
V_DD
CLOCK
DATA
SELECT
GND
Figure 10. MIC Element Drawing
A 0.1μF decoupling capacitor is required for V_DD. It can
be located inside the microphone or on the PCB very
close to the VDD pin.
Due to high input impedance, care should be taken to
remove all flux used during the reflow soldering process.
A 100ȍ resistance is recommended on the clock output
of the device driving the FAN3850A to minimize ringing
and improve signal integrity.
For optimal PSR, route a trace to the VDD pin. Do not
place a VDD plane under the device.
© 2010 Fairchild Semiconductor Corporation
FAN3850A • Rev. 3.0.6
9
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