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INMP441
Omnidirectional Microphone with Bottom Port and I2S Digital Output
GENERAL DESCRIPTION
The INMP441 is a high-performance, low power, digital-output,
omnidirectional MEMS microphone with a bottom port. The
complete INMP441 solution consists of a MEMS sensor, signal
conditioning, an analog-to-digital converter, anti-aliasing filters,
power management, and an industry-standard 24-bit I²S interface.
The I²S interface allows the INMP441 to connect directly to digital
processors, such as DSPs and microcontrollers, without the need
for an audio codec in the system.
The INMP441 has a high SNR, making it an excellent choice for
near field applications. The INMP441 has a flat wideband
frequency response, resulting in natural sound with high
intelligibility.
The INMP441 is available in a thin 4.72 × 3.76 × 1 mm surface-
mount package. It is reflow- solder compatible with no sensitivity
degradation. The INMP441 is halide free.
*Protected by U.S. Patents 7,449,356; 7,825,484; 7,885,423; and 7,961,897.
Other patents are pending.
APPLICATIONS
Teleconferencing Systems
Remote Controls
Gaming Consoles
Mobile Devices
Laptops
Tablets
Security Systems
FEATURES
Digital I²S Interface with High-Precision 24-Bit Data
High SNR of 61 dBA
High Sensitivity of -26 dBFS
Flat Frequency Response from 60 Hz to 15 kHz
Low Current Consumption of 1.4 mA
High PSR of -75 dBFS
Small 4.72 × 3.76 × 1 mm Surface-Mount Package
Compatible with Sn/Pb and Pb-Free Solder Processes
RoHS/WEEE Compliant
FUNCTIONAL BLOCK DIAGRAM
ADC
POWER
MANAGEMENT
INMP441
FILTER
HARDWARE
CONTROL
I2S
SERIAL
PORT
SCK
SD
WS
ORDERING INFORMATION
PART
INMP441ACEZ-R0*
INMP441ACEZ-R7
EV_INMP441
EV_INMP441-FX
* – 13” Tape and Reel
TEMP RANGE
−40°C to +85°C
−40°C to +85°C
† – 7” Tape and reel to be discontinued. Contact sales@invensense.com for
availability.
BOTTOM
TOP
InvenSense reserves the right to change the detail
specifications as may be required to permit improvements
in the design of its products.
InvenSense Inc.
1745 Technology Drive, San Jose, CA 95110 U.S.A
+1(408) 988–7339
www.invensense.com
Document Number: DS-INMP441-00
Revision: 1.1
Rev Date: 05/21/2014

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INMP441
TABLE OF CONTENTS
General Description ................................................................................................................................................... 1
Applications ............................................................................................................................................................... 1
Features ..................................................................................................................................................................... 1
Functional Block Diagram .......................................................................................................................................... 1
Ordering Information................................................................................................................................................. 1
Table of Contents.............................................................................................................................................................. 2
Specifications .................................................................................................................................................................... 4
Table 1. Electrical Characteristics .............................................................................................................................. 4
Table 2. I2S Digital Input/Output Characteristics ....................................................................................................... 5
Table 3. Serial Data Port Specifications ..................................................................................................................... 5
Timing Diagram.......................................................................................................................................................... 5
Absolute Maximum Ratings .............................................................................................................................................. 6
Table 4. Absolute Maximum Ratings ......................................................................................................................... 6
ESD Caution ............................................................................................................................................................... 6
Soldering Profile......................................................................................................................................................... 7
Table 5. Recommended Soldering Profile*................................................................................................................ 7
Pin Configurations And Function Descriptions ................................................................................................................. 8
Table 6. Pin Function Descriptions............................................................................................................................. 8
Typical Performance Characteristics................................................................................................................................. 9
Theory of Operation ....................................................................................................................................................... 10
Understanding Sensitivity ........................................................................................................................................ 10
Power Management ................................................................................................................................................ 10
Normal Operation ...................................................................................................................................................10
Standby Mode.........................................................................................................................................................10
Power-Down Mode.................................................................................................................................................10
Startup ....................................................................................................................................................................10
I²S Data Interface ..................................................................................................................................................... 11
Data Output Mode..................................................................................................................................................11
Data Word Length...................................................................................................................................................11
Data-Word Format..................................................................................................................................................11
Digital Microphone Sensitivity................................................................................................................................. 12
Synchronizing Microphones .................................................................................................................................... 13
Digital Filter Characteristics ..................................................................................................................................... 13
High-Pass Filter ........................................................................................................................................................ 13
Table 7. High Pass Filter Characteristics .................................................................................................................. 13
Low-Pass Filter ......................................................................................................................................................... 13
Applications Information ................................................................................................................................................ 15
Document Number: DS-INMP441-00
Revision: 1.1
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INMP441
Power-Supply Decoupling........................................................................................................................................ 15
Supporting Documents ................................................................................................................................................... 16
Evaluation Board User Guide................................................................................................................................... 16
Application Notes (Product Specific) ....................................................................................................................... 16
Application Notes (General) .................................................................................................................................... 16
PCB Design And Land Pattern Layout ............................................................................................................................. 17
PCB Material And Thickness .................................................................................................................................... 18
Handling Instructions ...................................................................................................................................................... 18
Pick And Place Equipment ....................................................................................................................................... 18
Reflow Solder........................................................................................................................................................... 18
Board Wash.............................................................................................................................................................. 18
Outline Dimensions......................................................................................................................................................... 19
Ordering Guide ........................................................................................................................................................ 20
Revision History ....................................................................................................................................................... 20
Compliance Declaration Disclaimer ......................................................................................................................... 21
Document Number: DS-INMP441-00
Revision: 1.1
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INMP441
SPECIFICATIONS
TABLE 1. ELECTRICAL CHARACTERISTICS
(TA = −40 to 85°C, VDD = 1.8 to 3.3 V, CLK = 2.4 MHz, CLOAD = 30 pF, unless otherwise noted. All minimum and
maximum specifications are guaranteed across temperature, voltage, and clock frequency specified in Table 1, Table
2, Table 3, unless otherwise noted. Typical specifications are not guaranteed.)
PARAMETER
PERFORMANCE
Directionality
Sensitivity
Signal-to-Noise Ratio (SNR)
Equivalent Input Noise (EIN)
Dynamic Range
Frequency Response
Total Harmonic Distortion (THD)
Power-Supply Rejection (PSR)
Maximum Acoustic Input
Noise Floor
POWER SUPPLY
Supply Voltage (VDD)
Supply Current (IS)
VDD = 1.8 V
VDD = 3.3 V
Normal Mode
Standby
Power Down
Normal Mode
Standby
Power Down
CONDITIONS
MIN
1 kHz, 94 dB SPL
20 Hz to 20 kHz, A-weighted
20 Hz to 20 kHz, A-weighted
Derived from EIN and
maximum acoustic input
Low frequency 3 dB point
High frequency 3 dB point
105 dB SPL
217 Hz, 100 mVp-p square
wave superimposed on VDD =
1.8 V
Peak
20 Hz to 20 kHz, A-weighted,
RMS
29
1.62
TYP MAX
Omni
26
61
33
87
60
15
23
3
75
120
87
3.63
1.4 1.6
0.8
2
2.2 2.5
0.8
4.5
UNITS
dBFS
dBA
dBA SPL
dB
Hz
kHz
%
dBFS
dB SPL
dBFS
V
mA
mA
µA
mA
mA
µA
DIGITAL FILTER
17.2/fS sec
Group Delay
fS = 48 kHz
fS = 16 kHz
359
1078
µs
µs
Pass-Band Ripple
±0.04
dB
Stop-Band Attenuation
60 dB
Pass Band
0.423 × fS
20.3 kHz
Note 1: The peak-to-peak amplitude relative to peak-to-peak amplitude of (224 − 1.) The stimulus is a 104 dB SPL sinusoid having RMS amplitude
of 3.1623 Pa. Sensitivity is relative to 1 Pa.
Note 2: See Figure 4 and Figure 5.
NOTES
1
2
Document Number: DS-INMP441-00
Revision: 1.1
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INMP441
TABLE 2. I2S DIGITAL INPUT/OUTPUT CHARACTERISTICS
PARAMETER
DIGITAL INPUT
CONDITIONS
Input Voltage High (VIH)
Input Voltage Low (VIL)
SD DIGITAL INPUT
L/R, WS, SCK
L/R, WS, SCK
Voltage Output Low (VOL)
VDD = 1.8 V, ISINK = 0.25 mA
Voltage Output Low (VOL)
Voltage Output High (VOH)
Voltage Output High (VOH)
Voltage Output Low (VOL)
VDD = 1.8 V, ISINK = 0.7 mA
VDD = 1.8 V, ISINK = 0.7 mA
VDD = 1.8 V, ISINK = 0.25 mA
VDD = 3.3 V, ISINK = 0.5 mA
Voltage Output Low (VOL)
VDD = 3.3 V, ISINK = 1.7 mA
Voltage Output High (VOH)
VDD = 3.3 V, ISINK = 1.7 mA
Voltage Output High (VOH)
VDD = 3.3 V, ISINK = 0.5 mA
Note 1: Limits based on characterization results; not production tested.
TABLE 3. SERIAL DATA PORT TIMING SPECIFICATIONS
PARAMETER
tSCH
tSCL
tSCP
fSCK
tWSS
tWSH
fWS
CONDITIONS
SCK high
SCK low
SCK period
SCK frequency
WS setup
WS hold
WS frequency
TIMING DIAGRAM
SCK
WS
tWSS
tSCH
tSCP
tSCL
SD
MIN
TYP
MAX
UNITS NOTES
0.7 x VDD
0
0.7 × VDD
0.9 × VDD
0.7 × VDD
0.9 × VDD
VDD
0.25 x VDD
0.1 × VDD
0.3 × VDD
0.1 × VDD
0.3 × VDD
V
V
V
V
V
V
V
V
V
V
1
1
1
1
1
1
1
1
1
1
MIN TYP
50
50
312
0.5
0
20
7.8
MAX
3.2
50
UNITS
ns
ns
ns
MHz
ns
ns
kHz
NOTES
tWSH
Document Number: DS-INMP441-00
Revision: 1.1
Figure 1. Serial Data Port Timing
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