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ADMP421 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADMP421
Beschreibung Omnidirectional Microphone
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADMP421 Datasheet, Funktion
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/






ADMP421 Datasheet, Funktion
ADMP421
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
DATA 5
VDD 4
1 CLK
2 L/R SELECT
3 GND
Figure 4. Pin Configuration (Bottom View)
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 CLK
Clock Input to Microphone.
2 L/R SELECT Left Channel or Right Channel Select.
DATA1 (right): L/R SELECT tied to GND.
DATA2 (left): L/R SELECT pulled to VDD.
3 GND Ground.
4 VDD
Power Supply. For best performance and to avoid potential parasitic artifacts, placing a 0.1 μF (100 nF) ceramic type
X7R or better capacitor between Pin 4 (VDD) and ground is strongly recommended. The capacitor should be placed
as close to Pin 4 as possible.
5 DATA Digital Output Signal (DATA1, DATA2).
http://www.DataSheet4U.net/
Rev. 0 | Page 6 of 16
datasheet pdf - http://www.DataSheet4U.net/

6 Page









ADMP421 pdf, datenblatt
ADMP421
RELIABILITY SPECIFICATIONS
The microphone sensitivity after stress must deviate by no more than 3 dB from the initial value.
Table 7.
Stress Test
Low Temperature Operating Life
High Temperature Operating Life
THB
Temperature Cycle
High Temperature Storage
Low Temperature Storage
Component CDM ESD
Component HBM ESD
Component MM ESD
Description
−40°C, 500 hrs, powered
+125°C, 500 hrs, powered
65°C/85% relative humidity (RH), 500 hrs, powered
−40°C/+125°C, one cycle per hour, 100 cycles
150°C, 500 hrs
−40°C, 500 hrs
All pins, 0.5 kV
All pins, 1.5 kV
All pins, 0.2 kV
http://www.DataSheet4U.net/
Rev. 0 | Page 12 of 16
datasheet pdf - http://www.DataSheet4U.net/

12 Page





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