WM7121DIMS/RV

Overview

The WM7121DIMS/RV is a top-port analogue silicon microphone manufactured by Cirrus Logic. It utilizes proprietary CMOS/MEMS membrane technology to deliver high signal-to-noise ratio and low power consumption within a miniature, low-profile package. The device features an omnidirectional response and operates on a supply voltage ranging from 1.5V to 3.7V. Key electrical parameters include a sensitivity of -38 dB with a tolerance of 1 dB, a signal-to-noise ratio of 65 dB, and an impedance of 55 Ohms. It draws 190 uA of operating current at 3.7 V, supports a frequency range of 200 Hz to 6 kHz, and functions within a temperature range of -40 C to +100 C.

Feature Summary

• Incorporates proprietary CMOS/MEMS membrane technology for high reliability and performance in a miniature, low-profile package.
• Designed to withstand high temperatures associated with automated flow solder assembly processes.
• Offers matched sensitivity, frequency response, and phase response performance comparable to bottom port microphones.

Applications

• Mobile phone handsets
• Portable media players

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and moisture sensitivity level prior to procurement. Ensure storage conditions meet humidity requirements to prevent damage. Validate part markings against official datasheet specifications to avoid counterfeit components.

Selection Notes

Select this component for applications requiring low-profile packaging and high signal-to-noise ratio. Consider the specific sensitivity tolerance variant required for production calibration needs. Evaluate power consumption constraints against the 190 uA operating current specification. Ensure interface compatibility with analog output requirements.

Part Context

The WM7121 series represents Cirrus Logic's solution for consumer audio applications requiring compact form factors. It distinguishes itself through integrated CMOS/MEMS technology that eliminates the need for external calibration in certain variants. The family supports both standard and tighter sensitivity tolerances to accommodate different manufacturing workflows.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify mechanical footprint and pinout compatibility if considering alternative MEMS microphone solutions from other manufacturers.