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INMP621
Wide Dynamic Range Microphone with PDM Digital Output
GENERAL DESCRIPTION
The INMP621*is a high sound pressure level (SPL), ultra-low
noise, low power, digital output, bottom ported
omnidirectional MEMS microphone. This microphone clips at
133 dB SPL, which is useful for clearly capturing audio in loud
environments. The INMP621 consists of a MEMS microphone
element and an impedance converter amplifier followed by a
fourth-order Σ-Δ modulator. The digital interface allows the
pulse density modulated (PDM) output of two microphones
to be time multiplexed on a single data line using a single
clock. The INMP621 is pin compatible with the INMP421 and
INMP521 microphones, providing an easy upgrade path.
The INMP621 has a high SNR of 65 dBA and sensitivity of
−46 dBFS. The INMP621 has an extended wideband frequency
response, resulting in natural sound with high intelligibility.
Low current consumption and a sleep mode at less than
5.5 µA enables long battery life for portable applications.
The INMP621 is available in a thin 4 × 3 × 1 mm surface-
mount package. It is reflow solder compatible with
no sensitivity degradation.
*Protected by U.S. Patents 7,449,356; 7,825,484; 7,885,423; and 7,961,897.
Other patents are pending.
FUNCTIONAL BLOCK DIAGRAM
INMP621
ADC
PDM
MODULATOR
POWER
MANAGEMENT
CHANNEL
SELECT
CLK
DATA
APPLICATIONS
Tablet Computers
Notebook PCs
Smartphones
Microphone Arrays
Teleconferencing Systems
Digital Still and Video Cameras
Bluetooth Headsets
Security and Surveillance
FEATURES
High Acoustic Overload Point of 133 dB SPL
Small, Thin 4 × 3 × 1 mm Surface-Mount Package
Omnidirectional Response
Very High Signal-to-Noise Ratio (SNR): 65 dBA
Sensitivity of −46 dBFS
Extended Frequency Response from 45 Hz to >20 kHz
Low Current Consumption: 1.2 mA
Sleep Mode for Extended Battery Life: 5.5 µA
High Power Supply Rejection (PSR): −100 dBFS
Fourth-Order Σ-Δ Modulator
Digital Pulse Density Modulation (PDM) Output
Compatible with Sn/Pb and Pb-Free Solder Processes
RoHS/WEEE Compliant
ORDERING INFORMATION
PART
INMP621ACEZ-R0*
INMP621ACEZ-R7
EV_INMP621-FX
* – 13” Tape and Reel
TEMP RANGE
−40°C to +85°C
−40°C to +85°C
† – 7” Tape and reel to be discontinued. Check with
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-INMP621-00
Revision: 1.1
Rev Date: 05/21/2014

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INMP621
TABLE OF CONTENTS
General Description ........................................................................................................................................................1
Functional Block Diagram ...............................................................................................................................................1
Applications ....................................................................................................................................................................1
Features ..........................................................................................................................................................................1
Ordering Information......................................................................................................................................................1
Table of Contents............................................................................................................................................................ 2
Specifications .................................................................................................................................................................. 4
Table 1. Electrical Characteristics ...................................................................................................................................4
Table 2. Timing Characteristics .......................................................................................................................................5
Timing Diagram ...............................................................................................................................................................5
Absolute Maximum Ratings ............................................................................................................................................ 6
Table 3. Absolute Maximum Ratings ..............................................................................................................................6
ESD Caution.....................................................................................................................................................................6
Soldering Profile..............................................................................................................................................................7
Table 4. Recommended Soldering Profile*.....................................................................................................................7
Pin Configurations And Function Descriptions ............................................................................................................... 8
Table 5. Pin Function Descriptions..................................................................................................................................8
Typical Performance Characteristics............................................................................................................................... 9
Theory Of Operation ..................................................................................................................................................... 10
PDM Data Format .........................................................................................................................................................10
Table 6. INMP621 Channel Setting ...............................................................................................................................10
PDM Microphone Sensitivity ........................................................................................................................................11
Dynamic Range Considerations ....................................................................................................................................12
Connecting PDM Microphones .....................................................................................................................................12
Sleep Mode ...................................................................................................................................................................14
Start-Up Time................................................................................................................................................................14
Supporting Documents ................................................................................................................................................. 15
Evaluation Board User Guide ........................................................................................................................................15
application Note (product Specific) ..............................................................................................................................15
Application Notes (general) ..........................................................................................................................................15
PCB Design And Land Pattern Layout ........................................................................................................................... 16
Alternative PCB Land Patterns ......................................................................................................................................17
PCB Material And Thickness .........................................................................................................................................17
Handling Instructions .................................................................................................................................................... 18
Pick And Place Equipment ............................................................................................................................................18
Reflow Solder ................................................................................................................................................................18
Document Number: DS-INMP621-00
Revision: 1.1
Rev Date: 05/21/2014
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INMP621
Board Wash...................................................................................................................................................................18
Outline Dimensions....................................................................................................................................................... 19
Ordering Guide ............................................................................................................................................................. 20
Revision History ............................................................................................................................................................20
Compliance Declaration Disclaimer ..............................................................................................................................21
Document Number: DS-INMP621-00
Revision: 1.1
Rev Date: 05/21/2014
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INMP621
SPECIFICATIONS
TABLE 1. ELECTRICAL CHARACTERISTICS
(TA = −40 to 85°C, VDD = 1.8 to 3.3 V, CLK = 3.072 MHz, CLOAD = 30 pF, unless otherwise noted. All minimum and maximum
specifications are guaranteed across temperature, voltage, and clock frequency specified in Table 1 and Table 2, unless otherwise
noted. Typical specifications are not guaranteed.)
PARAMETER
PERFORMANCE
Directionality
Output Polarity
Sensitivity
Signal-to-Noise Ratio (SNR)
Equivalent Input Noise (EIN)
Acoustic Dynamic Range
Digital Dynamic Range
Frequency Response
Total Harmonic Distortion (THD)
Power Supply Rejection (PSR)
Power Supply Rejection—Swept Sine
Acoustic Overload Point
Full-Scale Acoustic Level
POWER SUPPLY
Supply Voltage (VDD)
Supply Current (IS)
VDD = 1.8 V
Normal Mode
Sleep Mode
CONDITIONS
Input acoustic pressure vs.
output data
1kHz, 94 dB SPL
20 Hz to 20 kHz, A-
weighted
20 Hz to 20 kHz, A-
weighted
Derived from EIN and
acoustic overload point
Derived from EIN and full-
scale acoustic level
Low frequency −3 dB point
High frequency 3 dB
point
105 dB SPL
217 Hz, 100 mV p-p square
wave superimposed on
VDD = 1.8 V, A-weighted
1 kHz sine wave
10% THD
0 dBFS output
VDD = 3.3 V
Normal Mode
Sleep Mode
DIGITAL INPUT/OUTPUT CHARACTERISTICS
MIN
48
1.62
TYP MAX
Omni
Inverted
−46
65
44
29
104
111
45
>20
0.35 1
−100
113
133
140
3.63
1.2 1.5
5.5
1.3 1.6
8
UNITS NOTES
dBFS
dBA
dBA SPL
dB
dB
Hz
kHz
%
dBFS
dBFS
dB SPL
dB SPL
V
mA
µA
mA
µA
1, 2
2
3
4
4
Input Voltage High (VIH)
0.65 x VDD
V
Input Voltage Low (VIL)
0.35 x VDD
V
Output Voltage High (VOH)
ILOAD = 0.5 mA
0.7 x VDD
VDD
V
Output Voltage Low (VOL)
ILOAD = 0.5 mA
0
0.3 x VDD
V
Output DC Offset
Percent of full scale
3%
Latency
<30 µs
Noise Floor
20 Hz to 20 kHz, A-
weighted
111
dBFS
Note 1: Sensitivity is relative to the RMS level of a sine wave with positive amplitude equal to 100% logical 1s density and negative amplitude equal to 0% logical 1s
density.
Document Number: DS-INMP621-00
Revision: 1.1
Rev Date: 05/21/2014
Page 4 of 21

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INMP621
Note 2: The ±2 dB sensitivity specification is valid for CLK = 3.072 MHz. At lower clock frequencies, the minimum and maximum specifications are −49 dBFS and −43
dBFS, respectively.
Note 3: See Figure 4 and Figure 5.
Note 4: The microphone enters sleep mode when the clock frequency is less than 1 kHz.
TABLE 2. TIMING CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS NOTES
SLEEP MODE
Sleep Time
Wake-Up Time
INPUT
tCLKIN
Clock Frequency (CLK)
Time from CLK falling < 1
kHz
Time from CLK rising > 1
kHz to output within 3 dB
of final sensitivity, power
on
30
10
µs 1
ms
1
Input clock period
270
1000
ns
1.0 3.072 3.6 MHz 1
Clock Duty Cycle
40 60 %
OUTPUT
T1OUTEN
DATA1 (right) driven after
falling clock edge
31
ns
T1OUTDIS
DATA1 (right) disabled after
rising clock edge
5
23 ns
T2OUTEN
DATA2 (left) driven after
rising clock edge
31
ns
T2OUTDIS
DATA2 (left) disabled after
falling clock edge
5
26 ns
Note 1: The microphone operates at any clock frequency between 1.0 MHz and 3.6 MHz. Some specifications may not be guaranteed at frequencies other than 3.072 MHz.
TIMING DIAGRAM
tCLKIN
CLK
DATA1
t1OUTEN
t1OUTDIS
DATA2
t2OUTEN
t2OUTDIS
Figure 1. Pulse Density Modulated Output Timing
Document Number: DS-INMP621-00
Revision: 1.1
Rev Date: 05/21/2014
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