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MEMS技术及传感器

应用笔记

新产品简介

预发布产品

技术文章

网络研讨会和教程

MEMS和传感器主页

应用笔记

了解MEMS麦克风有助于提高系统设计效率

AN-1112:麦克风技术规格解析

与ADI公司的其它产品相比,MEMS麦克风的输入为声压波。因此,MEMS麦克风数据手册的某些技术规格可能不为大家所熟悉,或者虽然熟悉,但其应用方式却比较陌生。这篇4页的应用笔记解释了MEMS麦克风数据手册中出现的技术规格和术语,有助于设计人员提高麦克风的系统设计效率。

易于使用的数字输出加速度计

AN-1078:ADXL346快速入门指南

ADXL346 3轴加速度计检测x、y和z轴的加速度。检测重力时,若检测轴与地心引力方向相反,则测量正加速度。这篇8页的应用笔记说明ADXL346的电气连接、通信接口、初始化、输出数据格式、自测功能和失调寄存器。

易于使用的数字输出加速度计

AN-1077:ADXL345快速入门指南

ADXL345 3轴加速度计检测x、y和z轴的加速度。检测重力时,若检测轴与地心引力方向相反,则测量正加速度。这篇8页的应用笔记说明ADXL345的电气连接、通信接口、初始化、输出数据格式、自测功能和失调寄存器。

适用的贴装技术确保机械稳定性

AN-1073:陶瓷垂直贴装封装的焊接建议

焊接电子元件不仅可为这些元件提供电气连接,还可提供元件与印制电路板和其他基板之间的机械连接。事实上,焊接通常是将元件固定就位的唯一机械连接方式。相比固态器件,MEMS陀螺仪等机械传感器对焊接的机械可靠性特别敏感。陀螺仪和其他MEMS传感器在焊接时必须特别注意机械稳定性,由机械不稳定引起的任何移动都将转变为不需要的输出信号。这篇4页的应用笔记介绍陶瓷垂直贴装封装(CVMP)的焊接建议。CVMP可垂直贴装或平放。

精心焊接底部空腔MEMS麦克风以确保最佳性能

AN-1068:MEMS麦克风的回流焊

这篇8页的应用笔记提供了有关MEMS麦克风组装的指南和建议,介绍了ADMP401和ADMP421的各种详细参数、器件尺寸、建议的模板图形以及PCB焊盘布局图形。

过采样技术提升加速度计的分辨率

AN-1063:利用过采样技术改善ADXL345输出分辨率

ADXL345 3轴加速度计包括一个数字接口和内置模数转换器(ADC)。该器件在所有g范围内(±2 g、±4 g、±8 g和±16g)具有3.9 mg/LSB的分辨率,适合大多数应用。如果需要更大分辨率,可使用过采样技术。这篇2页的应用笔记说明如何利用先进先出(FIFO)缓冲器提高ADXL345的分辨率。

Circuits from the Lab

新产品简介

June 2011

Precision 3-axis Inclinometer/Accelerometer

adis16210The ADIS16210 digital inclinometer/accelerometer combines a 3-axis accelerometer with an embedded signal processor to provide precise measurements of roll- and pitch angles. An SPI-compatible serial interface communicates commands, and inclination-, acceleration-, on-chip temperature-, and power-supply data. The inclinometer features ±0.1° relative accuracy over a ±180° measurement range for roll- and pitch axes and a ±90° measurement range for the gravity axis; the accelerometer provides a ±1.7-g measurement range with ±0.05° axis-to-axis alignment error. Sample rate, digital filtering, power-management mode, and offset/null calibrations are all fully user configurable. Programmable alarms can report out-of-limit conditions, and the self-test feature can monitor operation of the sensor’s mechanical structure. Operating on a single 3.0-V to 3.6-V supply, the ADIS16210 draws 18 mA in normal mode and 230 μA in sleep mode. Available in a 15-lead, 15-mm × 24-mm × 15-mm compact module, it is specified from –40°C to 125°C and priced at $97.00 in 1000s.

Ten-Degrees-of-Freedom Inertial Sensor

adis16407The ADIS16407complete “10-degrees-of-freedom” inertial sensing system combines a 3-axis gyroscope—with ±75°/s, ±150°/s, and ±300°/s range settings; a 3-axis accelerometer—with ±18-g range; a 3-axis magnetometer—with ±2.5-gauss range; and a barometer—with 10-mbar to 1200-mbar range; plus a local temperature sensor, a 12-bit ADC, and a 12-bit DAC. The device is fully calibrated for sensitivity, bias, axial alignment, and linear acceleration over .the –40°C to +85°C temperature range. Functionally complete, it includes programmable self-test, power management, and alarms. All data and commands are communicated via an SPI-compatible serial interface. Operating on a single 4.75-V to 5.25-V supply, the ADIS16407 consumes 70 mA in normal mode and 1.4 mA in sleep mode. Available in a 24-lead, 23‑mm × 23‑mm × 23‑mm compact module, it is specified from –40°C to +105°C and priced at $444.00 in 1000s.

Vibration-rejecting yaw-rate Gyroscope has ?50?s measurement range

adxrs642The ADXRS642angular rate sensor uses an advanced, differential, quad-sensor design to reject the influence of shock and vibration, providing improved sensing in harsh environments. The output voltage, proportional to the angular rate about the Z‑axis, is ratiometric to an external reference. Bandwidth, from 0.01 Hz to 2 kHz, is set by an external capacitor; and the ±250°/s measurement range can be extended to ±450°/s by connecting an external resistor. Two digital self-test inputs excite the sensor electromechanically to test proper operation of the sensor and signal-conditioning circuits. A temperature output is available to facilitate compensation. Designed for industrial applications, inertial measurement units, and platform stabilization, the device can survive 10,000-g powered shocks. Operating with a single 4.75-V to 5.25-V supply, the ADXRS642 draws 3.5 mA. Available in a 32-ball CBGA package, it is specified from –40°C to +105°C and priced at $41.85 in 1000s.

2011年4月

快速启动、具有振动抑制特性的偏航角速度陀螺仪,测量范围为±20,000°/s

adxrs649 ADXRS649 角速率传感器采用先进的差分四传感器设计,可抑制冲击和振动的影响,有利于在恶劣的环境中执行检测。输出电压与Z轴的角速率成比例,与外部基准电压成比率关系。带宽范围为0.01 Hz至2 kHz,利用一个外部电容设置。通过增加一个外部电阻,可将测量范围扩大至±50,000°/s。该器件耗电量低,启动时间超快;以10 sps的速率工作时,一对CR2032纽扣电池可以供它持续工作三个月。两路数字自测输入提供机电激励,以测试传感器和信号调理电路是否正常工作。该器件提供温度输出,用于补偿方案。ADXRS649采用4.75 V至5.25 V单电源供电,功耗为3.5 mA。额定温度范围为–40°C至+105°C,提供7 mm × 7 mm × 3 mm CBGA芯片级封装,千片订量报价为47.97美元/片。

技术文章

Bob Scannell, Medical MEMS: How Motion Sensing Is Transforming Next-Generation Medical Device Designs, European Medical Device Technology, 5/25/2011

Christopher Fisher, Using an Accelerometer for Inclination Sensing, Tech Zone, 5/6/2011

Bob Scannell, Inertial MEMs, from Life-Enhancing to Life-Saving, MEMS Technology Review, 5/1/2011

Harvey Weinberg, Die mechanische Leistungsf鋒igkeit von Drehratensensoren verbessern, Elektronik Praxis, 4/14/2011

Bob Scannell, Improving Industrial Control with MEMS Inertial Sensors, Electronic Products, 3/15/2011

Bob Scannell, MEMS传感器弥补GPS的不足, EE Times, 2/20/2011

Bob Scannell, 通过精确可靠的振动检测实现基于状态的预见性维护, Sensors, 1/1/2011

网络研讨会和教程

MEMS传感器用于工业平台稳定系统 - MEMS加速度计和陀螺仪是多种平台控制和稳定系统的理想反馈检测元件。本研讨会将讨论开发基于MEMS的稳定系统时需要考虑的典型性能要求,并深入探讨产品选型,以及如何快速、低廉地实现系统功能集成。首播时间为4月20日。

半导体设计基础:传感器及其使用 -- 该系列研讨会共有12集,这是第一集。在本研讨会中,我们将介绍物理信号的概念,为什么要以及如何利用传感器将它变为模拟电气信号,然后又利用执行器、扬声器和电机等再将它变回物理信号,并通过处理实现最高精度的再现。

MEMS麦克风:从理论到应用 -- 本研讨会涉及下列主题:麦克风工作原理,ECM与MEMS麦克风,ADI MEMS麦克风对于最终客户的设计优势。

iSensor®运动检测技术概述 -- 本研讨会介绍iSensor运动检测技术、目标应用、典型编程特性和评估工具。

 

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