ADMP421:  iMEMS® 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 ...More

ADMP421:  iMEMS® Microphone Omni Directional Microphone with Bottom Port and Digital Output

Product Description

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 of 60.5 dBA, and a high sensitivity, of -26 dBFS. The high SNR and sensitivity make the ADMP421 excellent for far field applications. The ADMP421 has a flat frequency response from 100 Hz through 15 kHz. Low current consumption enables long battery life for portable applications. A built in particle filter provides for high reliability.

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.

Applications

  • Cell Phones
  • PC Audio
  • Digital Cameras
  • Bluetooth Headsets

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Features

  • Small and thin 3 mm × 4 mm × 1 mm surface mount package
  • High SNR 60.5 dBA
  • High Sensitivity -26 dBFS
  • Flat Frequency Response from 100 to >12 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 Compliant

Diagrams

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  • Symbols and Footprints
ADMP421 Functional Block Diagram
ADMP421 Functional Block Diagram