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Ultra Low-Noise, Low Sensitivity Tolerance PDM Digital Microphone

The INMP522 is a high-performance, ultra-low noise, low power, digital output, bottom-ported omnidirectional MEMS microphone. The INMP522 has a sensitivity tolerance of ±1 dB from part to part, making it ideal for microphone array and beamforming applications.

The INMP522 consists of a MEMS microphone element and an impedance converter amplifier followed by a fourth-order Σ Δ modulator. The digital interface enables the pulse density modulated (PDM) output of two microphones to be time multiplexed on a single data line using a single clock. The INMP522 is function and pin compatible with the INMP521 and INMP421 microphones, providing an easy upgrade path.

The INMP522 has a very high signal-to-noise ratio (SNR) and common sensitivity of −26 dBFS, making it an excellent choice for far-field applications. The INMP522 has an extended wideband frequency response, resulting in natural sound with high intelligibility. Low current consumption and a sleep mode with less than 2 µA current consumption enables long battery life for portable applications.

The INMP522 is available in a thin 4 × 3 × 1 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation.



Featured Markets

  • Smartphones and Feature Phones
  • Microphone Arrays
  • Tablet Computers
  • Teleconferencing Systems
  • Digital Still and Video Cameras
  • Bluetooth Headsets
  • Notebook PCs
  • Security and Surveillance

Product Details


(dB SPL)
LF Cutoff

4 × 3 × 1PDMBottom65116-2675NR/ND

Features & Benefits

  • ±1 dB Sensitivity Tolerance
  • Small and Thin 4 mm × 3 mm × 1 mm Surface-Mount Package
  • Omnidirectional Response
  • Very High SNR of 65 dBA
  • Sensitivity of −26 dBFS
  • Extended Frequency Response from 75 Hz to >20 kHz
  • Low Current Consumption of 800 µA
  • Sleep Mode for Extended Battery Life, <2 µA consumption
  • Acoustic Overload Point of 116 dB SPL
  • High PSR of −83 dBFS
  • Fourth-Order Σ-Δ Modulator
  • Digital PDM Output
  • Compatible with Sn/Pb and Pb-Free Solder Processes
  • RoHS/WEEE Compliant

Documentation & Resources

Datasheet / Product BriefVersionUpdatedDownload
INMP522 Datasheet1.12014-05-14Datasheet

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