Copyright

 Cirrus Logic, Inc. 2015–2017

(All Rights Reserved)

http://www.cirrus.com

DS1072PP1

MAY '17

Digital MEMS Microphone with

High Performance and Low Power Modes

Features

• High acoustic overload point (AOP, 131 dB SPL)

• High signal-to-noise ratio (SNR, 66 dB)

• Low variation in sensitivity (±1 dB)

• Low current consumption

— 650

A (High Performance Mode)

— 160

A (Low Power Mode)

—5

A (Standby Mode)

• PDM digital audio output

• Bottom-port LGA package

• 1.8-V supply

Description

The CS7250B is a high-performance digital MEMS

microphone, offering class-leading total harmonic distortion

(THD) performance, excellent SNR, and low power

consumption.

The CS7250B supports two operational modes, selected

according to the applied clock frequency. Low Power Mode

is ideal for always-on voice activity detection; High

Performance Mode is optimized for high fidelity recording.

The CS7250B incorporates a high-performance ADC,

which outputs a single-bit data stream using pulse density

modulation (PDM) encoding. The CS7250B supports

selectable left/right channel assignment for a two-channel

digital microphone interface, enabling efficient connection

of multiple microphones in stereo/array configurations.

The CS7250B is available in a 3.50 x 2.65 x 0.98-mm

bottom-port LGA package, with port diameter of 0.325 mm.

It is ideal for portable applications such as smartphones,

tablets, wearables and portable speech-recognition

devices.

Biasing

PDM

Digital 

Signal 

Processing

High 

Performance

Amp 

Ultralow 

Power ADC

CMOS ASIC

MEMS 

Transducer 

CLK

DATA

VDD

LRSEL

GND

Preliminary Product Information

This document contains information for a new product.

Cirrus Logic reserves the right to modify this product without notice.

CS7250B