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

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Replacement Parts

Rochester Electronics and Arrow Supply Assurance have partnered with Analog Devices to source products that have been previously discontinued or have become obsolete.

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.

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.


  • Smartphones and feature phones
  • Tablet computers
  • Teleconferencing systems
  • Digital still & video cameras
  • Bluetooth headsets
  • Notebook PCs
  • Security and surveillance