ABCelectronique : portail d'information dans le domaine de l'électronique
 
 
Numéro de sérieADMP421
CategorieMultimedia => Audio
DescriptionMEMS® Microphone Omni Directional Microphone With Bottom Port And Digital Output
The ADMP421 is a low cost, low power, digital output bottom ported omni-directional MEMs microphone. The ADM421 consists of a MEMs microphone element, an output amplifier and a 4th order sigma delta modulator. The digital interface allows for the PDM (Pulse Density Modulated) output of two microphones to be time multiplexed on a single data line using a single clock.
SociétéAnalog Devices
DatasheetTélécharger ADMP421 datasheet
 
 
  • Description courte
  • FEATURES

    Small and thin 1 mm surface-mount package High SNR of 60.5 dBA High sensitivity of -26 dBFS Flat frequency response from Hz to over 12 kHz Low current consumption: <650 A High PSRR of 80 dBFS Fourth-order - modulator Digital PDM output Compatible with Sn/Pb and Pb-free solder processes RoHS/WEEE compliant

    Omnidirectional Microphone with Bottom Port and Digital Output ADMP421

    The is a low cost, low power, digital output bottom ported omnidirectional MEMS microphone. The ADMP421 consists of a MEMS microphone element, an output amplifier, and a fourth-order - modulator. The digital interface 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 a 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 enables long battery life for portable applications. A built-in particle filter provides for high reliability. The ADMP421 is available in a thin 1 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation.

    APPLICATIONS
    Cell phones PC audio Digital cameras Bluetooth headsets
    HIGH-PASS FILTER FOURTH-ORDER - CONVERTER OUTPUT DRIVER
    REFERENCE VOLTAGE BIAS CURRENT MEMBRANE BACKPLATE LOW POWER DETECTOR MEMS VBIAS

    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. Trademarks and registered trademarks are the property of their respective owners.

    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 ©2008 Analog Devices, Inc. All rights reserved.

    Features.............................................................................................. 1 Applications....................................................................................... 1 General Description......................................................................... 1 Functional Block Diagram.............................................................. 1 Specifications..................................................................................... 3 Timing Characteristics................................................................ 4 Timing Diagram........................................................................... 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5

    Typical Performance Characteristics..............................................6 Pin Configuration and Function Descriptions..............................7 Handling Instructions.......................................................................8 Pick and Place Equipment............................................................8 Reflow Solder.................................................................................8 Board Wash....................................................................................8 Outline Dimensions..........................................................................9 Ordering Guide.............................................................................9

    = 25°C, VDD 1.8 V, CLK = 2.4 MHz, unless otherwise noted. All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed. Table 1.

    Parameter PERFORMANCE Directionality Sensitivity 1 Signal-to-Noise Ratio Equivalent Input Noise Frequency Response Total Harmonic Distortion Power Supply Rejection Ratio Maximum Acoustic Input INPUT CHARACTERISTICS Clock Supply Voltage Symbol Conditions Min Typ Omni Normal mode Sleep mode VDD 0 Noninverting Max Unit

    Supply Current OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Polarity

    Relative to the rms level of a sine wave with positive amplitude equal 100% 1s density, and negative amplitude equal 0% 1s density. Positive going (increasing) pressure on the membrane results in an increase in the number 1s at the output.