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MEMS and Sensors

Application Notes

Circuits from the Lab

New Product Briefs

Technical Articles

Webinars and Tutorials

MEMS and Sensors Home

Application Notes

AN-1314: AMR Angle Sensors

This 10-page Application Note describes anisotropic magnetoresistive (AMR) thin film materials, which are becoming increasingly important for position sensing. Magnetoresistive (MR) position measurement has many advantages over traditional technologies, including reliability, accuracy, and overall robustness. Low cost, small relative size, contactless operation, wide temperature range, insensitivity to dust and light, and operation over a wide magnetic field range all lead to a robust sensor design.

AN-1305: ADIS16445/ADIS16448 Mechanical Design Guidelines and Examples

The ADIS16445 and ADIS16448 are low profile, fully calibrated, MEMS inertial measurement units (IMU). This 4-page Application Note provides mechanical guidelines for mounting the IMU package, which provides four mounting holes, with recessed mounting ledges that help manage the overall height of the attachment hardware. The mounting holes provide enough clearance for M2 0.4 mm or 2-56 machine screws.

AN-1295: Mechanical Design Tips for ADIS16375, ADIS16480, ADIS16485, and ADIS16488

Packages for the ADIS16375, ADIS16480, ADIS16485, and ADIS16488 include four 2.4-mm mounting holes, an aluminum housing, and a 2-row, 24-pin, 1-mm pitch electrical interface connector. This 4-page Application Note provides tips for system-level installation.

AN-1266: Autonomous Shock Event Monitoring with the ADXL375

This 6-page Application Note describes a technique for autonomously detecting and capturing shock events using a low power, high-g, 3-axis digital MEMS accelerometer with minimal intervention from the host processor. The accelerometer can be programmed to monitor single or double (primary and secondary) shocks along any combination of X, Y, and/or Z axes. In addition, the entire shock profile can be captured for further analysis using an integrated 32 sample memory.

Circuits from the Lab

CN0303: MEMS-Based Vibration Analyzer with Frequency Response Compensation

This circuit offers a high linearity, low noise, wide-bandwidth vibration sensing solution that is ideal for applications, such as bearing analysis, engine monitoring, and shock detection, that require high dynamic range (70 g to 500 g) and flat frequency response to 22 kHz.

CN0284: High-Performance, Low-Noise Studio Microphone with MEMS Microphones, Analog Beamforming, and Power Management

This professional-grade studio or live-performance microphone uses up to 32 analog MEMS microphones connected to op amps and a difference amplifier. Designed for low noise, its output is linear for acoustic inputs up to 131 dB SPL. Powered from a single 9-V battery, the 9-V and 1.8-V power rails are generated from two voltage regulators. The ADMP411, which consists of a MEMS microphone element and an impedance-matching amplifier, has a frequency response that is flat to 28 Hz, making it ideal for full-bandwidth, wide dynamic range audio capture.

New Product Briefs

September 2014

High-temperature 2000/sec Gyroscope rejects vibration

adxrs645The ADXRS645 high-performance angular rate sensor operates at high-temperatures, using an advanced differential, quad sensor design to reject acceleration and vibration. The output voltage, ratiometric with respect to the reference supply, is proportional to the angular rate about the pitch or roll axis. The 2000/sec minimum measurement range may be extended to 5000/sec with the addition of a single external resistor. A temperature output is available for compensation techniques. Two digital self-test inputs electromechanically excite the sensor to test both it and the signal conditioning circuits. Operating on a 4.75-V to 5.25-V supply, the ADXRS645 draws 3.5 mA. Available in an 8-mm 9-mm 3-mm, 15-lead brazed package, it is specified from 40C to +175C and priced at $975.00 in 1000s.

Technical Articles

Mark Looney, An Introduction to MEMS Vibration Monitoring, Analog Dialogue, 2014-06-04

Bob Scannell, Wireless Vibration Sensors Enable Continuous And Reliable Process Monitoring, Electronic Design, 2014-02-25

Jerad Lewis and Brian Moss, MEMS Microphones, the Future for Hearing Aids, Analog Dialogue, 2013-11-01

Webinars and Tutorials

What is a "Wide Dynamic Range" Microphone and why does it matter to my design? - MEMS microphones with the capability to capture very high sound pressure acoustic waves (loud noises) with high fidelity hold the potential to improve user experience in audio capture and to make acoustic detection viable for a range of applications that might have previously been unsuitable for such methods. We'll discuss design considerations for these microphones and applications that might benefit from such high performance.

High-Performance MEMS; What does that mean? Learn the most common "high-performance metrics" that are associated with gyroscope/IMU applications, and gain insight into their characterization and performance impact in real-world applications. Topics covered in this webcast will also be useful for applications that use accelerometers.

Healthcare Webcast: MEMS Inertial Sensors in Healthcare Designs - In this webcast you will learn the basics on MEMS motion sensing including architectures and technology including accelerometers, gyroscopes, and IMUs. Applications explored include precise positioning/tracking of healthcare scanning equipment, surgical tool guidance, balance and control of prosthetics, and motion sensing.

Using MEMS Sensors for Industrial Platform Stabilization Systems - MEMS accelerometers and gyroscopes are ideal feedback sensing elements for many types of platform control and stabilization systems. This webcast will discuss typical performance requirements to consider when developing a MEMS-based stabilization system, along with insights on component selection and enabling quick, inexpensive, system-level integration of these functions.


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