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ADMP621 Datenblatt(PDF) 1 Page - Analog Devices

Teilenummer ADMP621
Bauteilbeschribung  Wide Dynamic Range Microphone with PDM Digital Output
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Wide Dynamic Range Microphone with
PDM Digital Output
Data Sheet
ADMP621
FEATURES
133 dB SPL acoustic overload point
Small and thin 4 mm × 3 mm × 1 mm surface-mount package
Omnidirectional response
Very high signal-to-noise ratio (SNR): 65 dBA
Sensitivity of −46 dBFS
Extended frequency response from 45 Hz to >20 kHz
Low current consumption: 1.2 mA
Sleep mode for extended battery life: 5.5 µA consumption
High power supply rejection (PSR): −100 dBFS
Fourth-order Σ-Δ modulator
Digital pulse density modulation (PDM) output
Compatible with Sn/Pb and Pb-free solder processes
RoHS/WEEE compliant
APPLICATIONS
Smartphones and feature phones
Tablet computers
Teleconferencing systems
Digital still and video cameras
Bluetooth headsets
Notebook PCs
Security and surveillance
FUNCTIONAL BLOCK DIAGRAM
ADMP621
ADC
POWER
MANAGEMENT
CLK
DATA
PDM
MODULATOR
CHANNEL
SELECT
Figure 1.
BOTTOM
TOP
Figure 2. Isometric Views of ADMP621 Microphone Package
GENERAL DESCRIPTION
The ADMP6211 is a high sound pressure level (SPL), ultralow
noise, low power, digital output, bottom ported omnidirectional
MEMS microphone. This microphone clips at 133 dB SPL, which
is useful for clearly capturing audio in loud environments. The
ADMP621 consists of a MEMS microphone element and an
impedance converter amplifier followed by a fourth-order Σ-Δ
modulator. The digital interface allows the pulse density
modulated (PDM) output of two microphones to be time
multiplexed on a single data line using a single clock. The
ADMP621 is pin compatible with the ADMP421 and ADMP521
microphones, providing an easy upgrade path.
The ADMP621 has a high SNR of 65 dBA and sensitivity of
−46 dBFS. The ADMP621 has an extended wideband frequency
response, resulting in natural sound with high intelligibility.
Low current consumption and a sleep mode with less than
5.5 µA of current consumption enables long battery life for
portable applications.
The ADMP621 is available in a thin 4 mm × 3 mm × 1 mm
surface-mount package. It is reflow solder compatible with
no sensitivity degradation.
1
Protected by U.S. Patents 7,449,356; 7,825,484; 7,885,423; and 7,961,897. Other patents are pending.
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
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
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


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