ADMP421

Obsolete

iMEMS® Microphone Omni Directional Microphone with Bottom Port and Digital Output

Data Sheet (Rev. D) Product Selection Table
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Overview

  • Small and thin 3 mm × 4 mm × 1 mm surface mount package
  • High SNR 61 dBA
  • High Sensitivity -26 dBFS
  • Flat Frequency Response from 100 to 15 kHz
  • Low Current Consumption < 650 μAmps
  • High PSRR of 80 dBFS
  • 4th Order Sigma Delta Modulator
  • Digital PDM output
  • Compatible with Sn/Pb and Pb-free solder processes
  • RoHS/WEEE compliant

Analog Devices has sold its MEMS Microphone product line to InvenSense.
Please visit the InvenSense ADMP421 product page for all technical support and sales information.

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.

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 and a sleep mode enable long battery life for portable applications. The ADMP421 complies with the TIA-920 Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones standard.

The ADMP421 will be available in a very thin 3 mm × 4 mm × 1 mm surface mount package. It is reflow solder compatible with no sensitivity degradation. It is halide-free.

Applications

  • Smartphones and features phones
  • Digital video cameras
  • Bluetooth Headsets
  • Video Phones
  • Teleconferencing systems
ADMP421
iMEMS® Microphone Omni Directional Microphone with Bottom Port and Digital Output
ADMP421-fbL
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Documentation

Application Note 1

Frequently Asked Question 1

Obsolete Data Sheet 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Audio & Video Converters 1
ADAU1361
PRODUCTION Stereo, Low Power, 96 kHz, 24-Bit Audio Codec with Integrated PLL
Digital Signal Processors (DSP) 4
ADAU1761
PRODUCTION SigmaDSP Stereo, Low Power, 96 kHz, 24-Bit Audio Codec with Integrated PLL
ADAU1373
Obsolete Low Power Codec with Speaker and Headphone Amplifier
ADAU1381
Obsolete Low-noise Stereo Codec with Enhanced Recording and Playback Processing
ADAU1781
Obsolete SigmaDSP Low-noise Stereo Audio Codec for Portable Applications
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Tools & Simulations

IBIS Model 1

Evaluation Kits

eval board
schematic 2
EVAL-ADMP421Z

ADMP421Z Evaluation Board

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Product Details

Analog Devices has sold its MEMS Microphone product line to InvenSense.
Please visit the InvenSense ADMP421 product page for all technical support and sales information.

This PCB includes the ADMP421 and a bypass capacitor mounted on a rigid PCB. The 12-pin header connects all microphone signals directly to a codec evaluation board such as the EVAL-ADAU1761Z or EVAL-ADAU1361Z, or to a custom evaluation system.

eval board
schematic 3
EVAL-ADMP421Z-FLEX

ADMP421 FLEX Evaluation Board

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Product Details

Analog Devices has sold its MEMS Microphone product line to InvenSense.
Please visit the InvenSense ADMP421 product page for all technical support and sales information.

This flex PCB includes just the ADMP421 and a bypass capacitor. The five wires allow an easy connection to the microphone’s PDM output data, clock, left/right select, VDD, and ground into your evaluation system. Two EVAL-ADMP421Z-FLEX boards can share common data, clock, VDD, and ground signals to multiplex both microphone signals on a common data line.

EVAL-MIC-ALL
MEMS Microphone Evaluation Boards
EVAL-ADMP421Z
ADMP421Z Evaluation Board
EVAL-ADMP421Z-FLEX
ADMP421 FLEX Evaluation Board

Latest Discussions

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