Wide Dynamic Range Microphone with PDM Digital Output
Please visit the InvenSense ADMP621 product page for all technical support and sales information.
The ADMP621 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 65 dBA and sensitivity of −46 dBFS. 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 5.5 µA of current consumption enables long battery life for portable applications.
The ADMP621 is available in a thin 4 mm × 3 mm × 1 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation.
- Smartphones and feature phones
- Tablet computers
- Teleconferencing systems
- Digital still and video cameras
- Bluetooth headsets
- Notebook PCs
- Security and surveillance