EVAL-ADMP404Z AD [Analog Devices], EVAL-ADMP404Z Datasheet - Page 7

• Manufacturer Part Number: EVAL-ADMP404Z
• Description: Omnidirectional Microphone with Bottom Port and Analog Output
• Manufacturer: AD [Analog Devices]

APPLICATIONS INFORMATION
The ADMP404 output can be connected to a dedicated codec
microphone input (see Figure 7) or to a high input impedance
gain stage (see Figure 8). A 0.1 µF ceramic capacitor (C1) at V
placed close to the ADMP404 supply pins is used for testing and
is recommended to adequately decouple the microphone from
noise on the power supply. A 1 µF or larger dc-blocking tantalum
capacitor (C2) is required at the output of the microphone.
CONNECTING THE ADMP404 TO A CODEC
Preliminary Technical Data
Figure 7. ADMP404 Connected to the Analog Devices
ADMP404
GND
0.1µF
C1
GND
V
DD
OUTPUT
1µF
C2
GND
ADAU1761
MIC INPUT
ADAU1761
Codec
Rev. PrH | Page 7 of 12
DD
CONNECTING THE ADMP404 TO AN OP AMP GAIN
STAGE
ADMP404
GND
Figure 8. ADMP404 Connected to the
0.1µF
C1
GND
V
DD
OUTPUT
GAIN = (R2 + R3)/R3
1µF
C2
R1
10kΩ
OP177
R3
GND
3
2
Op Amp
ADMP404
OP177
U1
R2
7
4
6