SPH0645LM4H-B
Overview
The SPH0645LM4H-B is a high-performance, bottom-ported MEMS microphone that outputs digital audio directly via a standard I2S interface. It eliminates the need for an external audio codec by integrating an acoustic sensor, a low-noise input buffer, and a sigma-delta modulator into a compact 3.50mm x 2.65mm package. Operating from 1.62V to 3.6V, it is designed to provide high-quality audio capture with a 65dB SNR for space-constrained electronics.
Why Choose This Part
The primary advantage is the direct I2S output which simplifies system architecture by removing the requirement for an analog-to-digital converter (ADC) or codec. It offers a high signal-to-noise ratio of 65dB(A) and a flat frequency response from 20Hz to 10kHz, ensuring clear audio reproduction in various environmental conditions.
Applications
Key Specifications
Getting Started
To integrate this microphone, ensure your microcontroller or DSP supports the I2S protocol as a master or slave device. Pay close attention to the bottom-port acoustic hole alignment on the PCB and follow the recommended SMD reflow profiles to avoid damaging the MEMS element. For rapid prototyping, many engineers use breakout boards that expose the BCLK, WS, and DATA pins for 3.3V logic systems.
