关键词： ADI , ADMP441 , MEMS , 麦克风
MEMS“ TItle=”MEMS“》MEMS” TItle=“MEMS”》MEMS麦克风，包含有MEMS传感器，信号调度，ADC，抗混杂滤波器，电源办理以及工业规范的24位I2S接口，并直接连到数字处理器如DSP和MCU.SNR为61 BA，灵敏度为−26 dBFS，平整的频率响应60Hz到15kHz，首要用在长途会议，游戏控制台，移动设备，笔记本电脑，平板电脑和安全体系。本文介绍了ADMP4411首要特性，方框图，体系框图和评价板子板EVAL-ADMP441Z电路图，资料清单。
The ADMP4411 is a high performance， low power， digital output， omnidirecTIonal MEMS microphone with a bottom port. The complete ADMP441 soluTIon consists of a MEMS sensor， signal conditioning， an analog-to-digital converter， antialiasing filters， power management， and an industry standard 24-bit I2S interface. The I2S interface allows the ADMP441 to connect directly to digital processors， such as DSPs and microcontrollers， with-out the need for an audio codec in the system.
The ADMP441 has a high SNR and high sensitivity， making it an excellent choice for far field applications. The ADMP441 has a flat wideband frequency response， resulting in natural sound with high intelligibility. A built-in particle filter provides high reliability.
The ADMP441 is available in a thin 4.72 mm × 3.76 mm × 1 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation. The ADMP441 is halide free.
ADMP4411首要特性：
Digital I²S interface with high precision 24-bit data
High SNR of 61 dBA
High sensitivity of −26 dBFS
Flat frequency response from 60 Hz to 15 kHz
Low current consumption of 1.4 mA
High PSR of −75 dBFS
Small 4.72 mm × 3.76 mm × 1 mm surface-mount package
Compatible with Sn/Pb and Pb-free solder processes
RoHS/WEEE compliant
ADMP4411使用：
Teleconferencing systems
Gaming consoles
Mobile devices
Laptops
Tablets
Security systems
图1.ADMP4411功用框图
图2.ADMP4411体系框图
评价板子板EVAL-ADMP441Z
EVAL-ADMP441Z SDP Daughter Board for the ADMP441 I2S MEMS Microphone
The EVAL-ADMP441Z is an evaluation board that works with the EVAL-ADMP441Z-FLEX and the system demonstration platform （SDP） to allow quick evaluation of the performance of the ADMP441 MEMS microphone. This evaluation system can be used to stream two channels of audio from two ADMP441 microphones to a PC over a USB connection. The system identifies itself to a PC as a standard USB audio interface; therefore， no additional drivers or software are required to run the system. One EVAL-ADMP441Z-FLEX board is included in the evaluation kit. The SDP-B controller board is purchased separately. The EVAL-ADMP441Z board also provides hardware control and probe/test points to examine the digital signals of the ADMP441.
评价套件包含：
EVAL-ADMP441Z daughter board
EVAL-ADMP441Z-FLEX board
5 V power supply
图3.评价板子板EVAL-ADMP441Z外形图
图4.评价板子板EVAL-ADMP441Z电路图
评价板子板EVAL-ADMP441Z资料清单：
