Ultralow Noise, Low Sensitivity Tolerance PDM Digital Microphone

Analog Devices has sold its MEMS Microphone product line to InvenSense.

Please visit the InvenSense ADMP522 product page for all technical support and sales information.

The ADMP522 is a high performance, ultralow noise, low power, digital output, bottom-ported omnidirectional MEMS microphone. The ADMP522 has a sensitivity tolerance of ±1 dB from part to part, making it ideal for microphone array and beamforming applications.

The ADMP522 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 ADMP522 is function-and pin-compatible with the ADMP521 and ADMP421 microphones, providing an easy upgrade path.

The ADMP522 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 ADMP522 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 ADMP522 is available in a thin 4 mm × 3 mm × 1 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation.

Applications

* Smartphones and feature phones

* Microphone arrays

* Tablet computers

* Teleconferencing systems

* Digital still and video cameras

* Bluetooth headsets

* Notebook PCs

* Security and surveillance

* ±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