High Performance Digital Microphone

The CS7250B is a low-profile digital microphone optimized for use in both high performance audio systems, as well as low power audio applications, including those with “always-on” voice control. The device incorporates Cirrus Logic’s proprietary CMOS/MEMS membrane technology, offering high reliability and excellent audio quality in a miniature, low-profile package. The CS7250B supports two operational modes selected according to the applied clock frequency. High performance mode offers low noise, wide dynamic range and class-leading THD even with very loud audio. Low power mode offers ultra low current consumption while maintaining excellent SNR. The CS7250B 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.


  • High SNR (66 dB)
  • High AOP (131 dB SPL)
  • Excellent THD (1% at 125 dB SPL)
  • 35 Hz low frequency rolloff
  • Low current consumption
    • 5µA (Sleep)
    • 160 µA (low power mode)
    • 650 µA (high performance mode)
  • PDM digital audio output
  • Proprietary ADC technology
    • Reduced clock-jitter sensitivity
    • Low noise floor
    • Stable in overload condition
  • Bottom Port LGA Package

Parametric Specifications

Not Recommended for New Designs

Press Releases


Jul 06

Cirrus Logic Accelerates Design of Next Generation Voice-Enabled Devices with Voice Capture Development Kit for Amazon Alexa Voice Service

Development Kit Offers Complete Low-Power, Two-Mic Solution to Deliver Superior Alexa Voice Interaction Experiences

May 17

Cirrus Logic Packs Industry-Leading Combination of Performance and Power Consumption into Digital Microphones

CS7250B and CS7257B High-Performance Digital MEMS Microphones Set New Standard for Audio Performance and Drop Power Consumption to Half of Competitive Products



Comprehensive Solutions