SB040422025 – MICROPHONE SCHEMATIC BLOCK

This schematic block features the ICS-43434, a high-performance digital MEMS microphone from TDK-InvenSense designed for clear, low-noise acoustic capture in voice-controlled devices, audio recorders, and embedded sound processing systems. Delivering a full digital I²S output, the ICS-43434 eliminates the need for external ADCs, simplifying system design and improving immunity to analog noise and interference.

Packaged in an ultra-compact top-port MEMS housing, this breakout-style module provides easy access to the microphone’s I²S data, word select, and bit clock pins, along with stable power routing optimized for low noise. With a 65 dB SNR, −26 dBFS sensitivity, and wide 50 Hz to 20 kHz frequency response, the ICS-43434 is well-suited for far-field voice detection, audio feature extraction, and high-quality sound capture in portable devices.

The ICS-43xxx family remains a popular choice in modern audio designs due to its small footprint, consistent performance, and long production availability from TDK.

Key Features:

• ICS-43434, low-noise digital MEMS microphone
• Direct I²S digital audio output—no external ADC required
• 65 dB signal-to-noise ratio (SNR)
• −26 dBFS sensitivity (typical)
• Wide 50 Hz–20 kHz frequency response
• Ultra-compact top-port MEMS package
• Low power consumption for battery-operated devices
• Breakout layout enables fast integration into embedded audio systems

Typical Applications:

• Voice assistants and wake-word detection
• IoT audio nodes and smart home devices
• Portable recorders and handheld instruments
• Robotics and sound localization systems
• Wearables and consumer electronics
• Audio feature extraction for ML/AI processing

By integrating this Quickboards schematic block, engineers can rapidly prototype digital audio capture systems, reduce analog front-end complexity, and leverage a proven, noise-resistant MEMS microphone architecture that pairs seamlessly with modern DSPs and microcontrollers featuring I²S interfaces.