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INMP401ACEZ-R7

P1-P3P4-P6P7-P9P10-P12P13-P14
INMP401
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 3. Frequency Response Mask
Figure 4. Typical Frequency Response (Measured)
Figure 5. Typical Power Supply Rejection Ratio vs. Frequency
10
–10
–8
–6
–4
–2
0
2
4
6
8
50 100 10k
FREQUENCY (Hz)
SENSITIVITY (dB)
1k
10
–20
–10
0
10 100 10k
FREQUENCY (Hz)
AMPLITUDE (dB)
1k
0
–80
100 10k
FREQUENCY (Hz)
PSR (dB)
1k
–10
–20
–30
–40
–50
–60
–70
Page 7 of 14
Document Number: DS-INMP401-00
Revision: 1.1
INMP401
APPLICATIONS INFORMATION
CONNECTING TO AUDIO CODECS
The INMP401 output can be connected to a dedicated codec microphone input (see Figure 6) or to a high input impedance gain
stage (see Figure 7.) A 0.1 µF ceramic capacitor placed close to the INMP401 supply pin is used for testing and is recommended to
adequately decouple the microphone from noise on the power supply. A DC-blocking capacitor is required at the output of the
microphone. This capacitor creates a high-pass filter with a corner frequency at
f
C
= 1/(2π × C × R)
where R is the input impedance of the codec.
A minimum value of 2.2 µF is recommended in Figure 6 because the input impedance of codecs can be as low as 2 kΩ at its highest
PGA gain setting, which results in a high-pass filter corner frequency at about 37 Hz. Figure 7 shows the INMP401 connected to an op
amp configured as a non-inverting preamplifier.
Figure 6. INMP401 Connected to a Codec
Figure 7. INMP401 Connected to an Op Amp
ADC
OR
CODEC
INMP401
G
ND
OUTPUT
INPUT
MICBIAS
2.2 µF
MINIMUM
0.1 µF
VDD
G
AIN = (R1 + R2)/R1
INMP401
GND
OUTPUT
1µF
MINIMUM
0.1µF
10kΩ
R1 R2
VDD
V
REF
V
OUT
V
REF
AMP
1.8-3.3 V
Page 8 of 14
Document Number: DS-INMP401-00
Revision: 1.1
INMP401
SUPPORTING DOCUMENTS
For additional information, see the following documents.
EVALUATION BOARD USER GUIDE
UG-445 Analog Output MEMS Microphone Flex Evaluation Board
UG-126 Analog Output MEMS Microphone Flex Evaluation Board
APPLICATION NOTES (PRODUCT SPECIFIC)
AN-0207 High Performance Analog MEMS Microphone’s Simple Interface to SigmaDSP Audio Codec
AN-0262 Low Noise Analog MEMS Microphone and Preamp with Compression and Noise Gating
APPLICATION NOTES (GENERAL)
AN-1003 Recommendations for Mounting and Connecting the Invensense Bottom-Ported MEMS Microphones
AN-1068 Reflow Soldering of the MEMS Microphone
AN-1112 Microphone Specifications Explained
AN-1124 Recommendations for Sealing Invensense, Bottom-Port MEMS Microphones from Dust and Liquid Ingress
AN-1140 Microphone Array Beamforming
AN-1165 Op Amps for MEMS Microphone Preamp Circuits
AN-1181 Using a MEMS Microphone in a 2-Wire Microphone Circuit
Page 9 of 14
Document Number: DS-INMP401-00
Revision: 1.1
P1-P3P4-P6P7-P9P10-P12P13-P14

INMP401ACEZ-R7

Mfr. #:
Buy INMP401ACEZ-R7
Manufacturer:
TDK InvenSense
Description:
MEMS Microphones Omnidirectional Microphone with Bottom Port and Analog Output
Lifecycle:
New from this manufacturer.
Delivery:
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