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1、ADIADMP441高性能低功耗数字MEMS麦克风解决方案关键字：工业控制,传感器,MEMSADI公司的ADMP441是高性能低功耗数字输出全方位的MEMS麦克风,包括有MEMS传感器,信号调理,ADC,抗混淆滤波器,电源管理以及工业标准的24位I2S接口,并直接连到数字处理器如DSP和MCU.SNR为61BA,灵敏度为−26dBFS,平坦的频率响应60Hz到15kHz,主要用在远程会议,游戏控制台,移动设备,笔记本电脑,平板电脑和安全系统.本文介绍了ADMP4411主要特性,方框图,系统框图和评估板子板EVAL-ADMP441Z电路图
2、,材料清单.TheADMP4411isahighperformance,lowpower,digitaloutput,omnidirectionalMEMSmicrophonewithabottomport.ThecompleteADMP441solutionconsistsofaMEMSsensor,signalconditioning,ananalog-to-digitalconverter,antialiasingfilters,powermanagement,andanindustrystandard24-bitI2Sinter
3、face.TheI2SinterfaceallowstheADMP441toconnectdirectlytodigitalprocessors,suchasDSPsandmicrocontrollers,with-outtheneedforanaudiocodecinthesystem. TheADMP441hasahighSNRandhighsensitivity,makingitanexcellentchoiceforfarfieldapplications.TheADMP441hasaflatwidebandfrequencyr
4、esponse,resultinginnaturalsoundwithhighintelligibility.Abuilt-inparticlefilterprovideshighreliability. TheADMP441isavailableinathin4.72mm×3.76mm×1mmsurface-mountpackage.Itisreflowsoldercompatiblewithnosensitivitydegradation.TheADMP441ishalidefree. ADMP4411主要特性: DigitalI²
5、Sinterfacewithhighprecision24-bitdata HighSNRof61dBA Highsensitivityof−26dBFS Flatfrequencyresponsefrom60Hzto15kHz Lowcurrentconsumptionof1.4mA HighPSRof−75dBFS Small4.72mm×3.76mm×1mmsurface-mountpackage CompatiblewithSn/PbandPb-freesolderprocesses RoHS/WEEEcompliant ADM
6、P4411应用: Teleconferencingsystems Gamingconsoles Mobiledevices Laptops Tablets Securitysystems 图1.ADMP4411功能框图 图2.ADMP4411系统框图 评估板子板EVAL-ADMP441ZEVAL-ADMP441ZSDPDaughterBoardfortheADMP441I2SMEMSMicrophone TheEVAL-ADMP441ZisanevaluationboardthatworkswiththeEVAL-ADMP441Z-F
7、LEXandthesystemdemonstrationplatform(SDP)toallowquickevaluationoftheperformanceoftheADMP441MEMSmicrophone.ThisevaluationsystemcanbeusedtostreamtwochannelsofaudiofromtwoADMP441microphonestoaPCoveraUSBconnection.ThesystemidentifiesitselftoaPCasastandardUSBaudiointerface;th
8、erefore,noadditionaldriversorsoftwarearerequiredtorunthesystem.OneEVAL-ADMP441Z-FLEXboardisincludedinth
