Ultra-Low Noise Microphone


Ultra-Low Noise Microphone

Ultra Low Noise Microphone

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. A built-in particle filter provides high reliability. 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

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