InvenSense INMP441 User Manual

INMP441
Omnidirectional Microphone with Bottom Port and I
2
S 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 ORDERING INFORMATION
PART
TEMP RANGE
INMP441ACEZ-R0*
−40°C to +85°C
INMP441ACEZ-R7†
−40°C to +85°C
EV_INMP441
—
EV_INMP441-FX
—
* – 13” Tape and Reel
† – 7” Tape and reel to be discontinued. Contact sales@invensense.com
for
availability.
INMP441
ADC
POWER
MANAGEMENT
SCK
SD
WS
GND GND GND
VDD
FILTER
I
2
S
SERIAL
PORT
HARDWARE
CONTROL
L/R
CHIPEN
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

InvenSense INMP441 Specifications

General

Interface	I2S
Operating Temperature	-40 °C to +85 °C
Package	LGA
Type	Digital MEMS
Frequency Response	60 Hz - 15 kHz
Sensitivity	-26 dBFS
Power Supply Voltage	1.8 V to 3.6 V
THD	0.5%

Summary

General Description

Applications

Lists various applications for the microphone.

Features

Highlights key characteristics and benefits of the microphone.

Functional Block Diagram

Ordering Information

Electrical Characteristics

Digital Input/Output Characteristics

Serial Data Port Specifications

Absolute Maximum Ratings

ESD Caution

Soldering Profile

Pin Configurations And Function Descriptions

Typical Performance Characteristics

Theory of Operation

Understanding Sensitivity

Explains the dBFS unit for digital microphone sensitivity.

Power Management

Details the normal, standby, and power-down operational modes.

Startup

Describes the output behavior during initial power-up.

I2S Data Interface

Data Output Mode

Describes the behavior of the SD output pin.

Data Word Length

Specifies the length of data words in bits.

Data-Word Format

Details the I2S data format and MSB-first convention.

Digital Microphone Sensitivity

Synchronizing Microphones

Digital Filter Characteristics

High-Pass Filter

Describes the high-pass filter for removing low frequencies.

Low-Pass Filter

Describes the low-pass filter for noise reduction.

Applications Information

Power-Supply Decoupling

Recommends capacitor placement for power supply stability.

Supporting Documents

PCB Design And Land Pattern Layout

PCB Material And Thickness

Handling Instructions

Pick And Place Equipment

Details how to handle the microphone with automated equipment.

Reflow Solder

Specifies requirements for solder paste and reflow profiles.

Board Wash

Provides guidance on cleaning procedures after assembly.

Outline Dimensions

Ordering Guide

Revision History

Compliance Declaration Disclaimer