INMP521

Ultra-Low Noise Microphone with Bottom Port and PDM Digital Output

GENERAL DESCRIPTION

The INMP521* is a high performance, ultra-low noise, low

power, digital output, bottom-ported omnidirectional MEMS

microphone. The INMP521 consists of a MEMS microphone

element and an impedance converter amplifier followed by a

fourth-order sigma-delta (Σ-Δ) modulator. The digital

interface allows for the pulse density modulated (PDM)

output of two microphones to be time-multiplexed on a

single data line using a single clock. The INMP521 is function

and pin compatible with the INMP421 microphone, providing

an easy upgrade path.

The INMP521 has a very high signal-to-noise ratio (SNR) and

common sensitivity of −26 dBFS, making it an excellent choice

for far field applications. The INMP521 has an extended wide-

band frequency response resulting in natural sound with high

intelligibility. Low current consumption and a sleep mode

with less than 1 µA current consumption enables long battery

life for portable applications. The INMP521 complies with the

TIA-920 Tele-communications Telephone Terminal Equipment

Transmission Requirements for Wideband Digital Wireline

Telephones standard.

The INMP521 is available in a thin 4 mm × 3 mm × 1 mm

surface-mount package. It is reflow solder compatible with

no sensitivity degradation. The INMP521 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

•

Smartphones and Feature Phones

•

Microphone Arrays

•

Tablet Computers

•

Teleconferencing Systems

•

Digital Still and Video Cameras

•

Bluetooth Headsets

•

Notebook PCs

•

Security and Surveillance

FEATURES

•

Small, Thin 4 × 3 × 1 mm Surface-Mount Package

•

Omnidirectional Response

•

Very High SNR of 65 dBA

•

Sensitivity of −26 dBFS

•

Wide Frequency Response from 100 Hz to 16 kHz

•

Low Current Consumption of 900 µA

•

Sleep Mode for Extended Battery Life, <1 µA

•

120 dB Maximum SPL

•

High PSR of −80 dBFS

•

Fourth-Order Σ-Δ Modulator

•

Digital PDM Output

•

Sn/Pb and Pb-Free Solder Processes

•

RoHS/WEEE Compliant

FUNCTIONAL BLOCK DIAGRAM

ORDERING INFORMATION

PART

TEMP RANGE

INMP521ACEZ-R0*

−40°C to +85°C

INMP521ACEZ-R7†

−40°C to +85°C

EV_INMP521

—

EV_INMP521-FX

—

* – 13” Tape and Reel

† – 7” Tape and reel to be discontinued. Contact sales@invensense.com for

availability.

BOTTOM

TOP

INMP521

ADC

POWER

MANAGEMENT

CLK

DATA

PDM

MODULATOR

CHANNEL

SELECT

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-ADMP521-00

Revision: 1.0.

Rev Date: 02/06/2014