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Analog Devices ADMP621 Wide Dynamic Range Microphone

Analog Devices ADMP621 Wide
Dynamic Range Microphone

Analog Devices ADMP621 Wide Dynamic Range Microphone is a high sound pressure level (SPL), ultralow 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 ADMP621 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 ADMP621 is pin compatible with the ADMP421 and ADMP521 microphones, providing an easy upgrade path. The ADMP621 has a high SNR of 65dBA and sensitivity of −46dBFS. The ADMP621 has an extended wideband frequency response, resulting in natural sound with high intelligibility. Low current consumption and a sleep mode with less than 5.5μA of current consumption enables long battery life for portable applications.
Features
  • 133dB SPL acoustic overload point
  • Small and thin 4mm × 3mm × 1mm surface-mount package
  • Omnidirectional response
  • Very high signal-to-noise ratio (SNR): 65dBA
  • Sensitivity of −46dBFS
  • Extended frequency response from 45Hz to > 20kHz
  • Low current consumption: 1.2mA
  • Sleep mode for extended battery life: 5.5μA consumption
  • High power supply rejection (PSR): −100dBFS
  • Fourth-order Σ-Δ modulator
  • Digital pulse density modulation (PDM) output
  • Compatible with Sn/Pb and Pb-free solder processes
  • RoHS/WEEE compliant
Applications
  • Smartphones and feature phones
  • Tablet computers
  • Teleconferencing systems
  • Digital still and video cameras
  • Bluetooth headsets
  • Notebook PCs
  • Security and surveillance
Functional Block Diagram
Functional Block Diagram
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  • Analog Devices Inc.
Published: 2015-06-24 | Updated: 2015-06-24