SPH8690LM4H-1-8

Overview

The SPH8690LM4H-1-8 is a digital MEMS microphone from the Sisonic family, manufactured by Syntiant. It features a bottom-port design and omnidirectional acoustic response. The device outputs Pulse Density Modulation (PDM) signals. Key electrical parameters include a signal-to-noise ratio of 65.5 dB, an acoustic overload point of 121 dB SPL, and a sensitivity of -26 +/- 1 dBV. It operates at a supply voltage of 1.8 V with a power supply rejection ratio of 86 dB. The frequency response starts at 25 Hz. Power consumption is specified as 260 µA in low-power mode and 1000 µA in standard mode.

Feature Summary

• Integrates a silicon-based MEMS sensor with a digital PDM interface for direct connectivity to processors.
• Features a bottom-port acoustic structure designed for compact mobile and wearable form factors.
• Offers multimode power operation allowing selection between low-power and standard performance states.

Applications

• Smartphones and tablets requiring high-fidelity voice capture
• Wearable devices with strict size and power constraints
• Voice-controlled IoT endpoints

Procurement Notes

Verify the specific suffix '-1-8' against official Syntiant documentation to confirm packaging and tape-and-reel specifications. Ensure compatibility with existing PCB footprints and acoustic venting requirements. Confirm availability status through authorized distributors as supply may be restricted. Validate that the selected variant meets all regulatory compliance standards for the target market.

Selection Notes

Select this component when a bottom-port configuration is required for space-constrained designs. Compare the 65.5 dB SNR and 121 dB SPL against application noise floors. Evaluate the 260 µA low-power current draw against battery life requirements. Consider the PDM interface compatibility with the host processor's audio codec or DSP.

Part Context

This part belongs to the Syntiant Sisonic series of digital MEMS microphones. These components are engineered for mobile applications demanding high signal integrity in noisy environments. The series typically includes variants with different port locations and power modes to suit diverse hardware architectures.

Replacement Considerations

Check for SPH8690LM4H-1 if the '-1-8' suffix denotes a specific packaging variation rather than a functional difference. Verify pinout and acoustic alignment before substituting with other bottom-port digital microphones from different manufacturers.