AKU4400 pages

Product Brief

AKU440
Digital Silicon MEMS Microphone
www.akustica.com

Key Features
HD Voice Microphone
63dB SNR, omni-directional
Matched sensitivity of -26dBFS +/-2dB
3

Small 4.0 x 3.0 x 1.0mm form factor
Super-wideband, flat frequency response
Industry leading PSR of -80dBFS
Robust PDM (Pulse Density Modulated) digital-

General Description
The AKU440 is a bottom ported, surface mountable,
digital output MEMS microphone in a space saving 4.0 x
3.0 x 1.0mm metal lid package. Designed for use in
Windows 8 Ultrabooks™, smartphones and media
tablets, the AKU440 offers excellent SNR of 63dB and
tightly controlled sensitivity of -26dBFS +/-2.
The AKU440 employs Pulse Density Modulation (PDM)
for data output, a single-bit digital stream which

output immune to RF/EM interference
Highly-matched microphones in frequency and
phase response for array applications
Industry-standard form, fit, and function for dropin replacement to existing module designs
Ultra-low power sleep current
Pb-free and RoHS compliant
Halogen Free in accordance with IEC61249-2-21

Target Applications

enables the multiplexing of stereo microphone data

Voice recognition applications in Ultrabooks™,

onto a single wire. With a user selectable L/R channel

mobile phones and tablet computers which require

option, the AKU440 is ideal for use in multiple

digital microphones with high SNR (>61dB) and

microphone applications such as microphone arrays
mounted on embedded camera modules in laptops or
tablet PCs.

tightly matched sensitivity.
Microphone arrays where noise cancellation and
beam forming applications can be optimized by
using closely-matched microphones.

Additionally, since the output of the AKU440 is a robust
digital signal, it is virtually immune to all forms of Radio

Cutting-edge, thin form factor smartphones and
mobile accessories.

Frequency Interference (RFI) and Electromagnetic
Interference (EMI). For the device manufacturer, this
translates to the highest degree of design flexibility and

Functional Block Diagram
VDD

L/R
SELECT

PREAMP

Σ-∆
Modulator

microphone placement freedom, and ultimately faster
time-to-market.
MIC

DATA OUT

MIC
BIAS

CHARGE
PUMP

SUPPORT
CIRCUITRY

CLOCK IN

GND
Data subject to change without notice | © Akustica, Inc. 2015 All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in
the event of applications for industrial property rights. | June 2015