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Application Notes

Over 2000 application notes and technical articles written by engineers, for engineers.
You can comment on any application note and contribute to the engineering community.
These articles offer experienced analysis, design ideas, reference designs, and tutorials—to make you an expert.

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Newest Appnotes

Op Amp Analysis, Tips and Tricks
Power Supplies
Pulse and Signal Generators
Sensors and Instrumentation
Telecom
Test and Measurement

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App Note 4170 Abstract
Improve Current Measurement Accuracy by Skewing the Input Offset Voltage on Current-Sense Amplifiers

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PDF (250K)

App Note 4443 Abstract
ICs Form Simple Thermometer-Style Voltage Indicator

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PDF (43K)

App Note 4415 Abstract
High-Side Current Amplifier Forms 28V Circuit Breaker

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PDF (70K)

App Note 4410 Abstract
Battery Backup with Delay

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PDF (45K)

App Note 4405 Abstract
Spare Op Amp Generates Its Own Regulated Negative Supply

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PDF (76K)

App Note 4438 Abstract
Protect Current-Sense Amplifiers Against Overvoltage Transients

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PDF (79K)

App Note 4327 Abstract
Keep Power Consumption in Check with Low-Power Comparators that Autosense Plugged-In Accessories

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PDF (98K)

App Note 4038 Abstract
Optimizing Ultrasound-Receiver VGA Output-Referred Noise and Gain: Improves Doppler Dynamic Range and Sensitivity

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PDF (55K)

App Note 3810 Abstract
Trends in Op Amps Reflect an Advancing Electronics Industry

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PDF (208K)

App Note 3741 Abstract
Analog ICs for Low Voltage Systems

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App Note 3634 Abstract
Visual Impact of Video Parameters in Video Systems: Part 2—The Effect of Chrominance-to-Luminance Delay

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App Note 3305 Abstract
Using the MAX4090 with the Reconstruction Filter

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App Note 3303 Abstract
Get A Grip On Clamps, Bias and AC-Coupled Video Signals

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App Note 2980 Abstract
Circuit Refinements Ensure Quality Audio in Portable Devices

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PDF (146K)

App Note 2879 Abstract
Selecting the Optimum Voltage Reference

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App Note 2914 Abstract
3V Supply Delivers 12VP-P to Piezoelectric Speaker

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App Note 2398 Abstract
3V DACs Used in ±10V Applications

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App Note 2378 Abstract
Handy Circuit Gives Systems Flexible Fault Protection

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PDF (358K)

App Note 754 Abstract
Selecting the Right Series Voltage Reference for Absolute-Accuracy Voltage-Output DAC Designs

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PDF (84K)

App Note 864 Abstract
EPOT Applications: Gain Adjustment in Op-Amp Circuits

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App Note 803 Abstract
EPOT Applications: Offset Adjustment in Op-Amp Circuits

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App Note 529 Abstract
15V Input Converter Generates -185V at 50mA

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App Note 110 Abstract
Boost Converter Has High Efficiency At Light Loads

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App Note 103 Abstract
pFET Linear Regulator Has Low Dropout Voltage

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App Note 69 Abstract
Micropower Circuit Monitors Positive Supply Current

Audio

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PDF (92K)

App Note 4428 Abstract
Rail-to-Rail: Railroading and the Electronics of Op Amps

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App Note 4607 Abstract
Add a Discrete Jack-Sensing Circuit to the MAX13330/MAX13331 Automotive Headphone Amplifier

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PDF (83K)

App Note 4164 Abstract
Amplifier Considerations in Ceramic Speaker Applications

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App Note 3687 Abstract
Quantitative Analysis Yields Objective Measurement for Audio Amplifier Click and Pop

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App Note 3354 Abstract
DirectDrive® Technology Enables 2V_RMS Audio Line Driver from a Single 3.3V Supply

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PDF (46K)

App Note 1931 Abstract
USB-Powered High Precision Hi-Fi Phono Preamp

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PDF (109K)

App Note 1760 Abstract
Class D Audio Amplifiers Save Battery Life

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PDF (78K)

App Note 161 Abstract
Using a DS1802 Push-Button Digital Potentiometer to Create an Audio Preamp with Attenuator

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App Note 1122 Abstract
Optimizing Audio Bridged Tied Load Amplifiers

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App Note 624 Abstract
Class D Audio Amplifier Output Filter Optimization

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PDF (188K)

App Note 988 Abstract
Driving Audio Piezoelectric Transducers

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PDF (26K)

App Note 899 Abstract
Low Noise Audio Power Supply Circuit

Battery Applications

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PDF (92K)

App Note 4428 Abstract
Rail-to-Rail: Railroading and the Electronics of Op Amps

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PDF (236K)

App Note 4326 Abstract
Reduce Standby Power Drains with Ultra-Low-Current, Pulse-Frequency-Modulated (PFM) DC-DC Converters

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PDF (89K)

App Note 4322 Abstract
Simplified Lithium-Ion (Li+) Battery-Charger Testing

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PDF (39K)

App Note 4134 Abstract
Using a Generic 0 to 1V Analog Multiplier to Ensure Accurate Power Management in Battery-Powered Applications

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PDF (31K)

App Note 1872 Abstract
Low-Battery Indicator Is Low Cost, Highly Efficient, and Environmentally Friendly

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PDF (26K)

App Note 527 Abstract
Simple Circuit Measures Battery Drain

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PDF (113K)

App Note 714 Abstract
Isolated Power Supplies for Telecom Applications

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PDF (31K)

App Note 478 Abstract
Current-Limit Circuit for the Buck Regulator

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PDF (42K)

App Note 240 Abstract
Overcurrent Monitor Operates up to 26V

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PDF (22K)

App Note 942 Abstract
Load Switcher Draws Only 6µA

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PDF (32K)

App Note 854 Abstract
Memory-Backup Supply is Simple And Efficient

Comparators

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PDF (28K)

App Note 4234 Abstract
AC-Based Continuity Tester Finds Single-Ended Faults

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App Note 4061 Abstract
Measuring the Output Jitter of the MAX999 Comparator

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PDF (163K)

App Note 3616 Abstract
Adding Extra Hysteresis to Comparators

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App Note 3473 Abstract
Read Isolated Digital States Without Power Drain

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PDF (37K)

App Note 3444 Abstract
Light Is On When Power Is Out

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PDF (57K)

App Note 3328 Abstract
Minimize Short-Circuit Current Pulse in Hot-Swap Controller

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PDF (35K)

App Note 3327 Abstract
Simple Circuit Doubles Input Frequency

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PDF (38K)

App Note 3223 Abstract
Semiconductor Toggle Switch

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PDF (55K)

App Note 3201 Abstract
Pulse-Width Modulator Operates at Various Levels of Frequency and Power

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PDF (57K)

App Note 3203 Abstract
Lowpass Filter Has Improved Step Response

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PDF (58K)

App Note 1186 Abstract
Ultra Low Power Reset Generator

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PDF (104K)

App Note 647 Abstract
Comparator/DAC Combinations Solve Data-Acquisition Problems

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App Note 886 Abstract
Selecting the Right Comparator

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App Note 1903 Abstract
Dual Comparator Forms Temperature-Compensated Proximity Detector

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PDF (32K)

App Note 854 Abstract
Memory-Backup Supply is Simple And Efficient

Current Sensing

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App Note 4470 Abstract
Constant-Power Source

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PDF (113K)

App Note 4603 Abstract
Process Control and PLC Tutorial

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PDF (92K)

App Note 4428 Abstract
Rail-to-Rail: Railroading and the Electronics of Op Amps

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PDF (42K)

App Note 4328 Abstract
Low-Loss LED Driver Improves a System's Green Footprint by Boosting Efficiency and Extending Battery Life

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PDF (48K)

App Note 4235 Abstract
Two Methods for Shutting Down a Current-Sense Amplifier

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PDF (73K)

App Note 4030 Abstract
Analog Multiplier Improves the Accuracy of High-Side Current-Sense Measurements

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PDF (60K)

App Note 4050 Abstract
Current Sensing on a Negative Voltage Supply Rail, using a Precision Instrumentation Amplifier

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PDF (54K)

App Note 4122 Abstract
Simple Regulator Provides Constant Voltage for High-Side Current Monitors

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PDF (39K)

App Note 4134 Abstract
Using a Generic 0 to 1V Analog Multiplier to Ensure Accurate Power Management in Battery-Powered Applications

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PDF (54K)

App Note 4078 Abstract
Extend Current-Sense Amplifier's Input Range Down to 0V

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App Note 3888 Abstract
Performance of Current-Sense Amplifiers with Input Series Resistors

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PDF (63K)

App Note 3948 Abstract
Simple, Latched Overcurrent Fault Detector Has Fast Response Time

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App Note 3906 Abstract
Creating a Bidirectional Current-Sense Amplifier from Two Unidirectional Current-Sense Amplifiers

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PDF (115K)

App Note 3883 Abstract
Practical Considerations for Advanced Current Sensing in High-Reliability Systems

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App Note 3855 Abstract
Precision Circuit Monitors Negative Supply Current

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PDF (104K)

App Note 3669 Abstract
Power-Sensing Circuit Breaker Breaks New Ground

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PDF (28K)

App Note 3536 Abstract
Moving-Coil Meter Measures Low-Level Currents

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PDF (33K)

App Note 2011 Abstract
High-Side Positive Current Sensor Monitors Negative Supply

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PDF (39K)

App Note 1867 Abstract
Optocoupler Extends High-Side Current Sensor to 1kV

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App Note 1949 Abstract
Bi-directional Current-Sense with Single Output

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PDF (36K)

App Note 1934 Abstract
Add High Voltage Capability to the MAX471/MAX472 High-Side Current Sense Amplifiers

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PDF (45K)

App Note 1862 Abstract
Circuit Drives Mixed Types and Quantities of LEDs

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PDF (75K)

App Note 1138 Abstract
Practical Data Acquisition using a Windows¹-based Power Meter

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App Note 1084 Abstract
High-Side Current Sensor Has Period Output

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PDF (30K)

App Note 1180 Abstract
High-Accuracy Current-Sense Amplifier Enables Current Sensing and Current Sharing

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PDF (31K)

App Note 478 Abstract
Current-Limit Circuit for the Buck Regulator

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PDF (42K)

App Note 240 Abstract
Overcurrent Monitor Operates up to 26V

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PDF (116K)

App Note 927 Abstract
Current-Sense IC Prevents Overcurrent Damage

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PDF (172K)

App Note 921 Abstract
Variable, Linear Current Source Operates On 5V

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PDF (45K)

App Note 3331 Abstract
High-Side Current-Sense Amplifier Operates at High Voltage

Filters

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PDF (262K)

App Note 4088 Abstract
New-Generation Video Filter Amplifiers Extend Battery Life in Handheld Video Systems

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PDF (58K)

App Note 3680 Abstract
Implementation of a DirectDrive Video Filter Amplifier's Negative Charge Pump and Analog Switch in Audio/Video Applications

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PDF (48K)

App Note 3520 Abstract
Low-Cost, 30MHz, Triple-Channel HDTV Reconstruction Filter

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PDF (139K)

App Note 3494 Abstract
The Basics of Anti-Aliasing: Using Switched-Capacitor Filters

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PDF (103K)

App Note 3390 Abstract
Reduced Termination Loss by Active Synthesis of Output Impedance

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PDF (307K)

App Note 3172 Abstract
Active Filters for Video

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PDF (176K)

App Note 3171 Abstract
Do Passive Components Degrade Audio Quality in Your Portable Device?

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PDF (85K)

App Note 624 Abstract
Class D Audio Amplifier Output Filter Optimization

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PDF (74K)

App Note 700 Abstract
Fixed-Gain Op Amps Simplify Filter Design

Miscellaneous

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PDF (92K)

App Note 4428 Abstract
Rail-to-Rail: Railroading and the Electronics of Op Amps

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PDF (166K)

App Note 4179 Abstract
Autozero Noise Filtering Improves Instrumentation Amplifier Output

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PDF (39K)

App Note 4134 Abstract
Using a Generic 0 to 1V Analog Multiplier to Ensure Accurate Power Management in Battery-Powered Applications

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PDF (154K)

App Note 4028 Abstract
How to Level Shift Video Signals for DC-Coupled Video Amplifiers/Filters

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PDF (66K)

App Note 4035 Abstract
Overvoltage Protection (OVP) for Sensitive Amplifier Applications

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PDF (55K)

App Note 3950 Abstract
A Measurement Technique for Determining RF Immunity

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PDF (82K)

App Note 3869 Abstract
Variations Among Current-Sink/Source Circuits with a Single Op Amp

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PDF (104K)

App Note 3669 Abstract
Power-Sensing Circuit Breaker Breaks New Ground

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PDF (71K)

App Note 3642 Abstract
Choosing a Low-Noise Amplifier

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PDF (127K)

App Note 3611 Abstract
Integrated DC Logarithmic Amplifiers

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PDF (29K)

App Note 1792 Abstract
Self-Oscillating Contactor Driver Minimizes Hold Power

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PDF (157K)

App Note 1094 Abstract
Choosing The Optimum Buffer/ADC Combination For Your Application

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PDF (69K)

App Note 484 Abstract
Harnessing Solar Power with Smart Power-Conversion Techniques

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PDF (41K)

App Note 1031 Abstract
Low-Power 3V ADC is 0.05% Linear

Motor Control

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PDF (63K)

App Note 4469 Abstract
Bipolar Stepper-Motor Driver has Few Components

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PDF (113K)

App Note 4603 Abstract
Process Control and PLC Tutorial

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PDF (25K)

App Note 1951 Abstract
Class D Motor-Speed Control

Op Amp Analysis, Tips and Tricks

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PDF (92K)

App Note 4428 Abstract
Rail-to-Rail: Railroading and the Electronics of Op Amps

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PDF (52K)

App Note 4348 Abstract
Minimize Voltage Offsets in Precision Amplifiers

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PDF (166K)

App Note 4179 Abstract
Autozero Noise Filtering Improves Instrumentation Amplifier Output

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PDF (73K)

App Note 4030 Abstract
Analog Multiplier Improves the Accuracy of High-Side Current-Sense Measurements

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PDF (60K)

App Note 4050 Abstract
Current Sensing on a Negative Voltage Supply Rail, using a Precision Instrumentation Amplifier

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PDF (30K)

App Note 4107 Abstract
Operational Amplifiers Glossary of Key Terms

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PDF (79K)

App Note 4057 Abstract
How to Increase the Operating Speed on the MAX4007

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PDF (173K)

App Note 4034 Abstract
Three is a Crowd for Instrumentation Amplifiers

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PDF (66K)

App Note 4035 Abstract
Overvoltage Protection (OVP) for Sensitive Amplifier Applications

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PDF (103K)

App Note 3390 Abstract
Reduced Termination Loss by Active Synthesis of Output Impedance

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PDF (103K)

App Note 2045 Abstract
Understanding Common-Mode Signals

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PDF (43K)

App Note 1957 Abstract
Avoiding Noise and Power Problems with Unused Op Amps

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PDF (71K)

App Note 1947 Abstract
Exact Circuit Analysis with Microsoft Excel

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PDF (55K)

App Note 1939 Abstract
Nodal Analysis of Op Amp Circuits

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PDF (60K)

App Note 1877 Abstract
One Resistor Takes Heat from Single-Supply Op Amps

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App Note 1868 Abstract
Negative Resistor Cancels Op Amp Load

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PDF (50K)

App Note 1155 Abstract
Consider the "Deboo" Single-Supply Integrator

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PDF (183K)

App Note 738 Abstract
Minimizing Component-Variation Sensitivity in Single Op Amp Filters

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PDF (30K)

App Note 1144 Abstract
Monitoring a Small Step Change of a DC Voltage

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PDF (68K)

App Note 741 Abstract
Rail-to-Rail Outputs and Beyond-the-Rails Inputs: The Inside Story on Micropower Op Amps

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PDF (29K)

App Note 1074 Abstract
DAC and Op Amp Generate Variable Negative Control Voltage

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PDF (119K)

App Note 184 Abstract
Digitally-Controlled Phase Shift Using the DS1669

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PDF (18K)

App Note 717 Abstract
Operational Amplifier Inputs

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PDF (25K)

App Note 781 Abstract
AC-Coupled Amplifier Requires No DC Bias

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PDF (26K)

App Note 1163 Abstract
Inexpensive Peak Detector Features Droopless Operation

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PDF (39K)

App Note 34 Abstract
Low-Power Op-Amp Reduces Cable Costs for pH Probe

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PDF (167K)

App Note 656 Abstract
Design Trade-Offs for Single-Supply Op Amps

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PDF (85K)

App Note 36 Abstract
Op-Amp Inputs Provide Ultra Low-Leakage Clamps

Power Supplies

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PDF (92K)

App Note 4428 Abstract
Rail-to-Rail: Railroading and the Electronics of Op Amps

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PDF (236K)

App Note 4326 Abstract
Reduce Standby Power Drains with Ultra-Low-Current, Pulse-Frequency-Modulated (PFM) DC-DC Converters

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PDF (89K)

App Note 4322 Abstract
Simplified Lithium-Ion (Li+) Battery-Charger Testing

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PDF (39K)

App Note 4134 Abstract
Using a Generic 0 to 1V Analog Multiplier to Ensure Accurate Power Management in Battery-Powered Applications

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PDF (64K)

App Note 4087 Abstract
An Introduction to Switch-Mode Power Supplies

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PDF (157K)

App Note 3983 Abstract
Designing Single-Switch, Resonant-Reset, Forward Converters

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PDF (50K)

App Note 3757 Abstract
Bias Supply Powers Low-Power Geiger-Mueller Tube

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PDF (48K)

App Note 3657 Abstract
Ultra-Low-Noise LDO Achieves 6nV/√Hz Noise Performance

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PDF (104K)

App Note 3669 Abstract
Power-Sensing Circuit Breaker Breaks New Ground

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PDF (45K)

App Note 3656 Abstract
Single Transistor Reduces LDO Noise by 46dB

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PDF (81K)

App Note 3668 Abstract
High-Efficiency Current Drive for High-Brightness LEDs

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PDF (149K)

App Note 3638 Abstract
2.2MHz Buck or Boost Power Supply for ADSL2+ Chipset

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PDF (196K)

App Note 3615 Abstract
DS3984/DS3988 Multiple Lamp Drive Scheme

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PDF (55K)

App Note 3614 Abstract
Staggering the Burst Dimmer on CCFL Displays

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PDF (132K)

App Note 3539 Abstract
A 50 Watt Internal Bus Architecture (IBA) Power Supply

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PDF (42K)

App Note 3468 Abstract
High-Efficiency Step-Up Converter Robs Parallel Port

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PDF (80K)

App Note 3397 Abstract
Clarification of DS1804 Ordering Information and Package Marking

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PDF (38K)

App Note 3330 Abstract
Build a Charge Pump with Ultra-Low Quiescent Current (Iq)

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PDF (24K)

App Note 2080 Abstract
Simple Circuit Disconnects Load from Low-Voltage Supply

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PDF (200K)

App Note 2043 Abstract
A Compact, Isolated Power Supply, 48V to 3.3V at 7A

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PDF (45K)

App Note 1862 Abstract
Circuit Drives Mixed Types and Quantities of LEDs

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PDF (113K)

App Note 714 Abstract
Isolated Power Supplies for Telecom Applications

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PDF (26K)

App Note 899 Abstract
Low Noise Audio Power Supply Circuit

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PDF (31K)

App Note 478 Abstract
Current-Limit Circuit for the Buck Regulator

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PDF (69K)

App Note 484 Abstract
Harnessing Solar Power with Smart Power-Conversion Techniques

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PDF (116K)

App Note 927 Abstract
Current-Sense IC Prevents Overcurrent Damage

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PDF (172K)

App Note 921 Abstract
Variable, Linear Current Source Operates On 5V

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PDF (32K)

App Note 854 Abstract
Memory-Backup Supply is Simple And Efficient

Pulse and Signal Generators

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PDF (61K)

App Note 4626 Abstract
Multiple-Pulse Generator Aids IC Testing

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PDF (55K)

App Note 3201 Abstract
Pulse-Width Modulator Operates at Various Levels of Frequency and Power

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PDF (28K)

App Note 1960 Abstract
Simple Pulse Generator Has Low Parts Count

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PDF (33K)

App Note 825 Abstract
Sawtooth Generator Exhibits ~1% Linearity And >80dB Dynamic Frequency Range

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PDF (23K)

App Note 982 Abstract
Low-Power, 32kHz Oscillator Operates Over Wide Supply Range

Sensors and Instrumentation

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PDF (44K)

App Note 4470 Abstract
Constant-Power Source

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PDF (64K)

App Note 4622 Abstract
High-Speed Op Amp Enables Infrared (IR) Proximity Sensing

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PDF (92K)

App Note 4428 Abstract
Rail-to-Rail: Railroading and the Electronics of Op Amps

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PDF (166K)

App Note 4179 Abstract
Autozero Noise Filtering Improves Instrumentation Amplifier Output

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PDF (126K)

App Note 4321 Abstract
Precision Instrumentation Amplifiers with Rejustors Solve High-Gain Applications

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PDF (54K)

App Note 4122 Abstract
Simple Regulator Provides Constant Voltage for High-Side Current Monitors

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PDF (173K)

App Note 4034 Abstract
Three is a Crowd for Instrumentation Amplifiers

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PDF (66K)

App Note 4035 Abstract
Overvoltage Protection (OVP) for Sensitive Amplifier Applications

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PDF (28K)

App Note 3536 Abstract
Moving-Coil Meter Measures Low-Level Currents

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PDF (57K)

App Note 2236 Abstract
Gamma-Photon Radiation Detector

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PDF (68K)

App Note 1860 Abstract
PWM Outputs Enhance Sensor-Signal Conditioners

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PDF (118K)

App Note 722 Abstract
3V/5V DACs Support Intelligent Current Loop

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PDF (46K)

App Note 1127 Abstract
Amplifier Provides Signal Conditioning for Piezofilm Sensor

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PDF (34K)

App Note 1085 Abstract
Selectable-Range Current Loop

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PDF (72K)

App Note 1069 Abstract
High-Gain Signal Conditioning Circuit for Thin and Thick Film Sensors

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PDF (59K)

App Note 689 Abstract
IC Temperature Sensors Find the Hot Spots

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PDF (33K)

App Note 823 Abstract
Two ICs Convert 4-20mA Signal to 0-5V Output

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PDF (26K)

App Note 3 Abstract
Thermocouple Pre Amp

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PDF (28K)

App Note 1212 Abstract
Pulsed Sensor Extends Battery Life

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PDF (23K)

App Note 1101 Abstract
IR Sensor/Monitor Wakes Host System

Telecom

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PDF (92K)

App Note 4428 Abstract
Rail-to-Rail: Railroading and the Electronics of Op Amps

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PDF (60K)

App Note 4050 Abstract
Current Sensing on a Negative Voltage Supply Rail, using a Precision Instrumentation Amplifier

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PDF (54K)

App Note 4122 Abstract
Simple Regulator Provides Constant Voltage for High-Side Current Monitors

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PDF (79K)

App Note 4057 Abstract
How to Increase the Operating Speed on the MAX4007

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PDF (127K)

App Note 3611 Abstract
Integrated DC Logarithmic Amplifiers

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PDF (29K)

App Note 1800 Abstract
Smart IC Maintains Uniform Bias Current For GaAs MESFETs

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PDF (113K)

App Note 714 Abstract
Isolated Power Supplies for Telecom Applications

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PDF (36K)

App Note 1117 Abstract
Small Photodiode Receiver Handles Fiber-Optic Data Rates to 800kbps

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PDF (36K)

App Note 1811 Abstract
Visible-Laser Driver Has Digitally Controlled Power Modulation

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PDF (73K)

App Note 4319 Abstract
FDL Network Loopback Support Using TDMoP Devices

Test and Measurement

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PDF (64K)

App Note 4622 Abstract
High-Speed Op Amp Enables Infrared (IR) Proximity Sensing

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PDF (92K)

App Note 4428 Abstract
Rail-to-Rail: Railroading and the Electronics of Op Amps

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PDF (166K)

App Note 4179 Abstract
Autozero Noise Filtering Improves Instrumentation Amplifier Output

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PDF (28K)

App Note 4234 Abstract
AC-Based Continuity Tester Finds Single-Ended Faults

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PDF (173K)

App Note 4034 Abstract
Three is a Crowd for Instrumentation Amplifiers

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PDF (36K)

App Note 3473 Abstract
Read Isolated Digital States Without Power Drain

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PDF (103K)

App Note 3390 Abstract
Reduced Termination Loss by Active Synthesis of Output Impedance

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PDF (38K)

App Note 1988 Abstract
Circuit Enables PC-Based Voltage Measurements

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PDF (75K)

App Note 1138 Abstract
Practical Data Acquisition using a Windows¹-based Power Meter

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