Low Power Top Port Digital Microphone

The WM7216 is a low-profile digital silicon microphone optimized for use with low power “always-on” voice control applications. The device incorporates Cirrus Logic’s proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The WM7216 supports two operational modes selected according to the applied clock frequency. High performance mode offers wide dynamic range and class-leading THD performance. Low power mode offers low current consumption while maintaining excellent SNR performance. The WM7216 offers tight tolerance on the microphone sensitivity, giving reduced variation between parts and removing the need for in-line production calibration of part-to-part microphone variations.

Features

  • High SNR (63 dB)
  • Low variation in sensitivity
    • ±1 dB tolerance
  • Low current consumption
    • 10 µA (sleep)
    • 300µA (low power mode)
    • 980 µA (high performance mode)
  • PDM digital audio output
  • Stereo/array operation
  • Proprietary ADC technology
    • Reduced clock-jitter sensitivity
    • Low noise floor
    • Stable in overload condition
  • Top port LGA package (WM721X compatible)
  • 1.62V to 3.6V supply

Parametric Specifications

Port Top
Voice Mode SNR (dB) 60
Record Mode SNR (dB) 63
AOP at 10% THD (dB SPL) 120
Sensitivity (dBV/Pa) -26
Sensitivity Tolerance +/- 1
Power Supply (V) 1.62-2
Low Power Mode Supply Current (µa) 300
High Performance Mode Supply Current (µa) 950
Package 4.0 x 3.0 x 1.0 mm

Technical Documents

WM7216 Product Datasheet

May 26, 2016, v4.0 : 716 Kb

CDBWM7216-M-1 Schematic and Layout

Sep 30, 2015, v1.0 : 568 Kb

1700 EV1 REV1 Customer User Manual

Jul 1, 2014, v1.2 : 818 Kb

1171 EV2 REV2 Example Configurations

Jul 1, 2014, v1.1 : 148 Kb

1171 EV2 REV2 Schematic and Layout

Aug 1, 2010, v1.0 : 375 Kb

Design Resources

CDBWM7216-M-2 Evaluation Board Data Sheet

Feb 29, 2016, DS1127DB1 : 411 Kb

WAN_0284 General Design Considerations for MEMS Microphones

Jan 6, 2016, WAN0284 rev 1.2 : 506 Kb

WAN_0263 Interfacing WM72xx Digital Microphones

Nov 5, 2015, WAN0263 rev 1.2 : 326 Kb

WAN_0285 Microphone Power Gating

Nov 5, 2015, WAN0285 rev 1.1 : 508 Kb

WAN_0273 MEMS MIC Assembly and Handling Guidelines

Nov 5, 2015, WAN0273 rev 1.3 : 624 Kb

WAN_0290 An Introduction to MEMS Microphone Specifications

Jun 15, 2015, WAN0290 rev 1.0 : 538 Kb

Software and Tools

1700-EV1 Setup

n/a : 21112 Kb

WM7000 Setup

n/a : 1433 Kb

Applications

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Comprehensive Solutions