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ADMP421ACEZ-RL7 データシート(PDF) 1 Page - Analog Devices

部品番号 ADMP421ACEZ-RL7
部品情報  Omnidirectional Microphone with Bottom Port and Digital Output
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

ADMP421ACEZ-RL7 データシート(HTML) 1 Page - Analog Devices

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Omnidirectional Microphone with
Bottom Port and Digital Output
ADMP421
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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.
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.
FUNCTIONAL BLOCK DIAGRAM
ASIC
DATA
L/R SELECT
CLK
VDD
GND
MEMS
MEMBRANE
BACKPLATE
IMPEDANCE
CONVERTER
ADC
ADMP421
Figure 1.


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