The ADMP401 is a high quality, high performance, low power, analog output, bottom-ported omnidirectional MEMS microphone. It features a high SNR of 62 dBA, sensitivity of -42 dBV, flat frequency response from 100 Hz to 15 kHz, and low current consumption of <250 μA.
The ADMP401 is an analog‑output MEMS microphone featuring a bottom‑port design, high signal‑to‑noise ratio, and low current consumption, making it suitable for portable devices such as smartphones and headsets. It integrates a MEMS element, impedance converter, and output amplifier in a 4.72 mm × 3.76 mm × 1.0 mm surface‑mount package.
Key specifications include a typical sensitivity of –42 dBV, 62 dBA SNR, 100 Hz‑15 kHz flat frequency response, 250 µA supply current, and 70 dB PSRR. The microphone can be connected directly to a codec or an op‑amp gain stage using a 0.1 µF decoupling capacitor and a dc‑blocking capacitor at the output. Handling guidelines recommend standard pick‑and‑place tools and avoiding vacuum suction on the bottom port.
| Supply Current | 250 µA |
|---|---|
| Supply Voltage Range | 1.5 V – 3.3 V |
| Output Impedance | 200 Ω |
| Maximum Acoustic Input | 120 dB SPL |
The ADMP401 draws a typical supply current of 250 µA.