INMP621 MEMS Digital Microphone

INMP621 MEMS Digital Microphone

InvenSense's INMP621 is a high sound pressure level (SPL), ultra-low noise, low power, digital output, bottom-ported, omnidirectional MEMS microphone. This microphone clips at 133 dB SPL, which is useful for clearly capturing audio in loud environments. The INMP621 consists of a MEMS microphone element and an impedance converter amplifier followed by a fourth-order Σ-Δ modulator. The digital interface allows the pulse density modulated (PDM) output of two microphones to be time multiplexed on a single data line using a single clock. The INMP621 is pin compatible with the INMP421 and INMP521 microphones, providing an easy upgrade path.

The INMP621 has a high SNR of 65 dBA and sensitivity of -46 dBFS. The INMP621 has an extended wideband frequency response, resulting in natural sound with high intelligibility. Low current consumption and a sleep mode with less than 5.5 µA of current consumption enables long battery life for portable applications.

The INMP621 is available in a thin 4 mm x 3 mm x 1 mm surface-mount package. It is reflow-solder compatible with no sensitivity degradation.

View INMP621 Functional Block Diagram

Features and Benefits
  • 133 dB SPL acoustic overload point
  • Small and thin 4 mm x 3 mm x 1 mm surface-mount package
  • Very-high SNR: 65 dBA
  • Sensitivity of -46 dBFS
  • Extended frequency response from 45 Hz to greater than 20 kHz
  • Low current consumption: 1.2 mA
  • Omnidirectional response 
  • Sleep mode for extended battery life: 5.5 µA consumption
  • High power supply rejection (PSR): -100 dBFS
  • Fourth-order Σ-Δ modulator
  • Digital pulse density modulation (PDM) output
  • Compatible with Sn/Pb and Pb-free solder processes
  • RoHS/WEEE compliant
  • Smartphones and feature phones
  • Microphone arrays
  • Tablet computers
  • Teleconferencing systems
  • Digital still and video cameras
  • Bluetooth headsets
  • Notebook PCs
  • Security and surveillance