MEMS“ title=”MEMS“》MEMS” title=“MEMS”》MEMS麥克風(fēng)，包括有MEMS傳感器，信號調(diào)理，ADC，抗混淆濾波器，電源管理以及工業(yè)標(biāo)準(zhǔn)的24位I2S接口，并直接連到數(shù)字處理器如DSP和MCU.SNR為61 BA，靈敏度為?26 dBFS，平坦的頻率響應(yīng)60Hz到15kHz，主要用在遠(yuǎn)程會議，游戲控制臺，移動設(shè)備，筆記本電腦，平板電腦和安全系統(tǒng)。本文介紹了ADMP4411主要特性，方框圖，系統(tǒng)框圖和評估板子板EVAL-ADMP441Z電路圖，材料清單。

　　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主要特性：

　　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應(yīng)用：

　　Teleconferencing systems

　　Gaming consoles

　　Mobile devices

　　Laptops

　　Tablets

　　Security systems

　　圖1.ADMP4411功能框圖

　　圖2.ADMP4411系統(tǒng)框圖

　　評估板子板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.

　　評估套件包括：

　　EVAL-ADMP441Z daughter board

　　EVAL-ADMP441Z-FLEX board

　　5 V power supply

　　圖3.評估板子板EVAL-ADMP441Z外形圖

　　圖4.評估板子板EVAL-ADMP441Z電路圖

　　評估板子板EVAL-ADMP441Z材料清單：