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Analog Devices - Omnidirectional Microphone

Numéro de référence ADMP421
Description Omnidirectional Microphone
Fabricant Analog Devices 
Logo Analog Devices 





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ADMP421 fiche technique
Omnidirectional Microphone with
Bottom Port and Digital Output
ADMP421
FEATURES
Small and thin 3 mm × 4 mm × 1 mm surface-mount package
High SNR of 61 dBA
High sensitivity of −26 dBFS
Flat frequency response from 100 Hz to 15 kHz
Low current consumption: <650 μA
High PSRR of 80 dBFS
Fourth-order Σ-Δ modulator
Digital PDM output
Compatible with Sn/Pb and Pb-free solder processes
RoHS/WEEE compliant
APPLICATIONS
Smartphones and feature phones
Digital video cameras
Bluetooth headsets
Video phones
Teleconferencing systems
GENERAL DESCRIPTION
The ADMP421 is a low cost, low power, digital output bottom-
ported omnidirectional MEMS microphone. The ADMP421
consists of a MEMS microphone element, an impedance converter
amplifier, and a fourth-order Σ-Δ modulator. The digital inter-
face 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 ADMP421 has a high SNR and high sensitivity, making it
an excellent choice for far field applications. The ADMP421 has
a flat wideband frequency response resulting in natural sound
with high intelligibility. Low current consumption and a sleep
mode enable long battery life for portable applications. A built-
in particle filter provides high reliability. The ADMP421 complies
with the TIA-920 Telecommunications Telephone Terminal
Equipment Transmission Requirements for Wideband Digital
Wireline Telephones standard.
The ADMP421 is available in a thin 3 mm × 4 mm × 1 mm
surface-mount package. It is reflow solder compatible with no
sensitivity degradation. The ADMP421 is halide free.
http://www.DataSheet4U.net/
FUNCTIONAL BLOCK DIAGRAM
MEMS
MEMBRANE
BACKPLATE
ASIC
ADMP421
IMPEDANCE
CONVERTER
ADC
DATA
L/R SELECT
CLK
VDD
GND
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.
datasheet pdf - http://www.DataSheet4U.net/

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