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INMP621 Datasheet Preview

INMP621 Datasheet

Wide Dynamic Range Microphone

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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




InvenSense

INMP621 Datasheet Preview

INMP621 Datasheet

Wide Dynamic Range Microphone

No Preview Available !

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
Page 2 of 21


Part Number INMP621
Description Wide Dynamic Range Microphone
Maker InvenSense
Total Page 21 Pages
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