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.

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

TEMP RANGE

INMP621ACEZ-R0*

−40°C to +85°C

INMP621ACEZ-R7†

−40°C to +85°C

EV_INMP621-FX

—

* – 13” Tape and Reel

† – 7” Tape and reel to be discontinued. Check

with sales@invensense.com for availability.

INMP621

ADC

POWER

MANAGEMENT

CLK

DATA

PDM

MODULATOR

CHANNEL

SELECT

BOTTOM

TOP

FUNCTIONAL BLOCK DIAGRAM

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: 1.0.

Rev Date: 02/06/2014