AKU2400 pages

Product Brief

AKU240
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) digitaloutput immune to RF/EM interference
Highly-matched microphones in frequency and
phase response for array applications

General Description
The AKU240 is a top ported, surface mountable, digital
output MEMS microphone in a space saving 4.0 x 3.0 x

Industry-standard form, fit, and function for drop-in
replacement to existing module designs

1.0mm form factor. Designed for use in Windows 8
Ultrabooks™, smartphones and media tablets, the

Ultra-low power sleep current

AKU240 offers excellent SNR of 63dB and tightly
controlled sensitivity of -26dBFS +/-2. Leveraging a

Halogen Free in accordance with IEC61249-2-21

unique packaging technology, the AKU240 provides
audio engineers with the high SNR and flat frequency
response of a bottom port MEMS microphone, but in a
convenient top port form factor.
The AKU240 employs Pulse Density Modulation
(PDM) for data output, a single-bit digital stream
which enables the multiplexing of stereo microphone
data onto a single wire. With a user selectable L/R
channel option, the AKU240 is ideal for use in multiple
microphone applications such as microphone arrays
mounted on embedded camera modules in laptops or

Pb-free and RoHS compliant

Target Applications
Voice recognition applications in Ultrabooks™,
mobile phones and tablet computers where digital
microphones with high SNR (>61dB) and tightly
matched sensitivity are required.
Microphone arrays where noise cancellation and
beam steering applications can be optimized by
using closely-matched microphones.
Cutting-edge, thin form factor smartphones and
mobile accessories.

Functional Block Diagram

tablet PCs.

VDD

L/R
SELECT

PREAMP

Σ-∆
Modulator

Additionally, since the output of the AKU240 is a
robust digital signal, it is virtually immune to all forms
of

Radio

Frequency

Interference

Electromagnetic Interference (EMI).

(RFI)

and

MIC

For the device

manufacturer, this translates to the highest degree of

MIC
BIAS

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

DATA OUT

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