ADMP521

Obsolete

Ultra-Low Noise Microphone with Bottom Port and PDM Digital Output

Data Sheet (Rev. A) Product Selection Table
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Overview

  • Small and thin 3 mm × 4 mm × 1 mm surface-mount package
  • Omnidirectional response
  • Very High SNR of 65 dBA
  • Sensitivity of −26 dBFS
  • Extended frequency response from 100 Hz to
    16 kHz
  • Low current consumption:
    900 µA
  • Sleep mode for extended battery life, <1 µA consumption
  • 120 dB maximum SPL
  • High PSR of -80 dBFS
  • Fourth-order Σ-Δ 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 ADMP521 product page for all technical support and sales information.

The ADMP521 is a high performance, ultra low noise, low power, digital output bottom-ported omnidirectional MEMS microphone. The ADMP521 consists of a MEMS microphone element and an impedance converter amplifier followed by a fourth-order Σ-Δ 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 ADMP521 is function- and pin-compatible with the ADMP421 microphone, providing an easy upgrade path.

The ADMP521 has a very high SNR and common sensitivity of −26 dBFS, making it an excellent choice for far field applications. The ADMP521 has an extended wideband frequency response resulting in natural sound with high intelligibility. Low current consumption and a sleep mode with less than 1 µA current consumption enables long battery life for portable applications. The ADMP521 complies with the TIA-920 Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones standard.

The ADMP521 is available in a thin 3 mm × 4 mm × 1 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation. The ADMP521 is halide free.

APPLICATIONS

  • Smartphones and feature phones
  • Tablet computers
  • Teleconferencing systems
  • Digital still & video cameras
  • Bluetooth headsets
  • Notebook PCs
  • Security and surveillance
ADMP521
Ultra-Low Noise Microphone with Bottom Port and PDM Digital Output
ADMP521-fbl ADMP521-pc
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Documentation

User Guide 2

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
ADAU1381
Obsolete Low-noise Stereo Codec with Enhanced Recording and Playback Processing
ADAU1373
Obsolete Low Power Codec with Speaker and Headphone Amplifier
ADAU1781
Obsolete SigmaDSP Low-noise Stereo Audio Codec for Portable Applications
ADAU1761
PRODUCTION SigmaDSP Stereo, Low Power, 96 kHz, 24-Bit Audio Codec with Integrated PLL
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Tools & Simulations

IBIS Model 1

Evaluation Kits

eval board
schematic 2
EVAL-ADMP521

ADMP521Z Evaluation Board

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Product Details

Analog Devices has sold its MEMS Microphone product line to InvenSense.
Please visit the InvenSense ADMP521 product page for all technical support and sales information.

This PCB includes the ADMP521 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-ADMP521-FLEX

ADMP521 FLEX Evaluation Board

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Product Details

Analog Devices has sold its MEMS Microphone product line to InvenSense.
Please visit the InvenSense ADMP521 product page for all technical support and sales information.

This flex PCB includes just the ADMP521 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-ADMP521Z-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-ADMP521
ADMP521Z Evaluation Board
EVAL-ADMP521-FLEX
ADMP521 FLEX Evaluation Board

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