Sensing
All electronic-based sensors convert a physical world effect, such as movement or temperature, to an electronic analog. That electronic analog, voltage, current, change in electronic component, can then be amplified and often converted to digital format. Some sensors, such as LVDT position sensors, require a specialized drive signal and demodulation to extract a useful signal. Other sensors are simpler, such as those that provide a current directly proportional to temperature.
Application Notes
- AN-925 : AN-925: Sensors for the AD7147 and AD7148 CapTouch Controllers
- AN-918 : Motionless Bandwidth Test for MEMS Sensors
- AN-900 : Enhancing the Performance of Pedometers Using a Single Accelerometer
- AN-892 : Temperature Measurement Theory and Practical Techniques
- AN-876 : Replacing Nationals LM75 with the Analog Devices, Inc. ADT75
- AN-854 : Sensor PCB Design Guidelines for the AD7142 and AD7143 Capacitance-to-Digital Converters (Rev. A, 2/07)
- AN-849 : Using Op Amps as Comparators
- AN-833 : Using the AD7142 and a Capacitive Sensor to Develop a Single-Push Digital Shutter Button
- AN-830 : 0: Factors Affecting Sensor Response
- AN-793 : ESD/Latch-Up Considerations with iCoupler® Isolation Products
- AN-768 : Using the ADXRS150/ADXRS300 in Continuous Self-Test Mode
This application note describes how to use the self-test system such that the integrity of the gyro is tested continuously. - AN-767 : Using Absolute Output iMEMS® Gyroscopes with Ratiometric ADCs
- AN-695 : Using the ADN8831 TEC Controller Evaluation Board (Rev. B, 9/2007)
- AN-688 : Phase and Frequency Response of iMEMS® Accelerometers and Gyros
- AN-661 : ADuC814 to ADM1032 via I2C® Interface
Even though the ADuC814 has an on-chip ±1.5°C temperature sensor, configured through the on-board ADC registers, it is often required that a remote or external temperature sensor be used. - AN-661 Accompanying Source Code (zip, 3 kB)
- AN-660 : XY-Matrix Keypad Interface to MicroConverter®
- AN-660 Accompanying Source Code (zip, 6 kB)
- AN-649 : Using the Analog Devices Active Filter Design Tool
- AN-625 : Modifying the Range of the ADXRS150 and ADXRS300 Rate Gyros
- AN-607 : 07: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC
- AN-604 : 04: Using the ADXL202 Duty Cycle Output
- AN-603 : 03: A Compact Algorithm Using the ADXL202 Duty Cycle Output
- AN-602 : 02: Using the ADXL202 in Pedometer and Personal Navigation Applications
- AN-601 : 01: Minimizing Power Consumption of iMEMS® Accelerometers
- AN-600 : 00: Embedding Temperature Information in the ADXL202's PWM Outputs
- AN-598 : Temperature Compensation Techniques for Low g iMEMS Accelerometers
- AN-596 : Using the ADXL202/ADXL210 with the Parallax BASIC Stamp Module® to Speed Algorithm Development
- AN-588 : AD7416/AD7417/AD7418 Power-On Reset Circuit
If a large number of decoupling capacitors are used on the VDD line, re-applying power before VDD has discharged to 0 V can cause the AD7416/AD7417/AD7418 to reset into an unknown. state. - AN-561 : AD7416 Connects to the PIC16F84 via Emulated I²C™ Interface
- AN-560 : 0: Low Voltage Amplifier
The AD8517/AD8527 operates at supply voltages as low as 1.8 V. This amplifier is ideal for battery-powered applications since it can operate at the end of discharge voltage of most popular batteries. - AN-417 : Fast Rail-to-Rail Operational Amplifiers Ease Design Constraints in Low Voltage High Speed Systems
Movement towards lower power supply voltages is driven by the demand that systems consume less and less power coupled with the desire to reduce the number of power supply voltages in the system. The following applications are discussed: Single-Ended and Differential Input ADC Input Circuits, Video Line Driver, Active Filter, HDSL Transceiver, and Transformer Drive Circuits. - AN-411 : Acceleration to Frequency Circuits
- AN-359 : Settling Time of Operational Amplifiers
- AN-358 : Noise and Operational Amplifier Circuits
- AN-357 : Operational Integrators
- AN-356 : User's Guide to Applying and Measuring Operational Amplifier Specifications
- AN-3 : AB-3: Digital Nulling of Precision Op Amps
- AN-256 : Accurately Testing Op Amp Settling Times
- AN-253 : Find Op Amp Noise with Spreadsheet
- AN-25 : Applying the OP06 Op Amp As a High Precision Comparator
- AN-138 : SPICE-Compatible Op Amp Macro-Models
- AN-117 : OP-42 Advanced SPICE Macro-Model
- AN-113 : AB-113: Precision Ramp Generator
- AN-112 : AB-112: Single Resistor Controls Wien Bridge Oscillator Frequency
Frequency control can be added to the conventional Wien Bridge Circuit by adding an op amp inverter. - AN-111 : AB-111: Single-Supply Wien Bridge Oscillator
Wien Bridge Oscillators require only one op amp, important in battery-operation. This circuit operates from a single 9V battery. - AN-109 : AB-109: High Speed Precision Rectifier
The low offsets and excellent load driving capability of the OP-27 are key advantages in this precision rectifier circuit. - AN-108 : 08: JFET-Input Amps are Unrivaled for Speed and Accuracy
- AN-106 : 06: A Collection of Amp Applications
Examines Some of the Numerous and Widely Used Applications of the Operational Amplifier - AN-0 : 0: Theory of Operation for AD8555 Evaluation Hardware and Software
- AN-0 : Using the ADXL202 Accelerometer as a Multifunction Sensor (Tilt, Vibration and Shock) in Car Alarms
- AN-0 : Using the ADXL105 in Headlamp Leveling Systems
- AN-957: Layout Guidelines for the AD7147 and AD7148 CapTouch Controllers
Ask the Experts
- Analog Devices, Inc. Application Engineering Department
For technical support and additional information, please contact our experienced applications engineers who are readily available to assist you. Thank you.
Evaluation Boards/Tools
- Resolver-to-Digital Converter Selection Tool
- iSensor™ PC-USB Evaluation System (Preliminary Rev. PrB)
This system enables quick evaluation and characterization of each digital-SPI iSensor™Sensor product through the USB port on a PC. This system includes all interface PCBs, cables and software required supporting ADIS16XXX/PCB evaluation. Each ADIS16XXX/PCB must be purchased separately. - AD7414/AD7415 Evaluation Tools (EVAL-AD7414/15EB)
Evaluation Board for SMBus/I2C®, 10-Bit Digital Temperature Sensor - ADM1041 Evaluation Tools (EVAL-ADM1041EB)
Evaluation Board for the Secondary-Side Controller with Current Share and Housekeeping (Preliminary) - ADT7316 Evaluation Tools
Technical Articles
- iCoupler™: Optokoppler abgehängt (German)
- Integrated Transformer-Coupled Isolation, by Ronn Kliger, (pdf, 544,768 bytes)
Copyright (c) 2003 IEEE. Reprinted from (IEEE Instrumentation & Measurement Magazine Volume: 6, Issue: 1, March 2003). This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Analog Devices's products or services Internal or personal use of this material is permitted. - Auto-Zero Amplifiers
A wide variety of electronic applications, especially those involving very small input signals, require signal paths with very low offset voltage and offset voltage drift over time and temperature. - Simple circuit provides precision ADC interface
(EDN, 08/21/03) - Circuit Measures True-rms and Average Value
(EDN, Design Ideas, 9/26/2002) - Choosing an A/D Converter for Motor Control Apps
Designers must solve challenges associated with current and voltage monitoring, optical encoder feedback, and resolver-to-digital conversion (Electronic Products, 5/2004) - Analog Devices AD7725 16-Bit Delta-Sigma ADC
... Analog Devices' New 16-Bit Sigma Delta ADC Features On-Chip Programmable Post Processor -- Post processor runs 130 million multiply-accumulate operations per second to free up external processing requirements. (ChipCenter Product Review, Product of the Week) - iCoupler™: Remplacer un photocoupler rapide par un isolator logique micro-usiné (French)
- Optical MEMS Viewed as Bandwidth Solution
(EE Times, July 10, 2001) - The "Interactive Designer ADXL202"
- Isolated Analog I/O Designs Benefit from New Family of
- Demystifying Auto-Zero Amplifiers Part 2
by Eric Nolan and Reza Moghimi (Analog Dialogue, May 2000) - Single IC provides gains of 10 and –10
by Moshe Gerstenhaber and Charles Kitchin, Analog Devices, Inc. (EDN, 8/7/2003) - Protecting Instrumentation Amplifiers
... All data acquisition board designs have to contend with ESD, EMI, and overvoltages. Can one solution protect the circuitry against all three hazards?
(First published in the April 2000 issue of Sensors Magazine) - Testing MEMS: Don't Reinvent the Wheel-But Take Little On Faith
... MEMS, which not only condition signals but also move, require consummate care in handling. But the manufacturers have figured out much of what you must know to successfully apply the devices. So be highly selective in choosing where to independently build up your private body of knowledge.
(EDN, October 11, 2001) - ADXL50 Now in Robot Submarine
- Isolation with Waferscale Transformers
By R. Kliger, B. Chen and J. Wynne, Analog Devices, Inc. (Reprinted with permission of Power Electronics Europe, Issue 6, 2003) - Making MEMS Accelerometers Work in Motion Control
By Joseph Bergeron and Mark Looney, Analog Devices, Inc.
Planet Analog, July 13, 2007 - High-Voltage Monitor Features High Accuracy
... Article is on page 3 of PDF.
(Electronic Design, Ideas for Design, 8/19/2002)