ADMP421Preliminary Technical Data FEATURES Small and thin 3 mm × 4 mm × 1 mm surface-mount package High SNR of 60.5 dBA High sensitivity of 26 dBFS Flat frequency response from 100 Hz to over 12 kHz Low current consumption: Omnidirectional Microphone with Bottom Port and Digital Output ADMP421 GENERAL DESCRIPTION The ADMP421 is a low cost, low power, digital output bottom ported omnidirectional MEMS microphone. The ADMP421 consists of a MEMS microphone element, an output amplifier, and 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 u……