Miniature Bottom Port Analog MEMS Microphone

The CS7331 is a low-profile silicon analog microphone offering high Signal-to-Noise Ratio (SNR) and low power consumption. The device incorporates Cirrus Logic’s proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The compact integration of transducer and internal circuitry on a single die enables implementation with an extremely small package. The CS7331 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.

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Application Categories

Mobile Audio Devices, Wearables, Headsets


  • High SNR (63 dB)
  • Low variation in sensitivity
    • ±1 dB tolerance
  • Low current consumption (55µA)
  • Analog output
  • Bottom Port LGA package
  • 2.5mm x 1.6mm x 0.9mm package size
  • 1.6 to 3.6 V supply

Parametric Specifications

Port Bottom
SNR (dB) 63
AOP at THD < 10% (dB SPL) 124
Sensitivity (dBV) -38
Sensitivity Tolerance (+/- dB) 1
Power Supply (V) 1.6-3.6
Supply Current (µA) 55µA (typ), 60µA (max)
Package 2.5 x 1.6 x 0.9 mm

Software and Tools

1700-EV1 Setup

n/a : 21112 Kb

WM7000 Setup

n/a : 1433 Kb



Comprehensive Solutions