DC Signal Referencing
DC signal references are used in many places in both analog and data conversion applications. For data conversion, the voltage reference is the standard against which the input signal is compared, i.e., the digital output represents the ratio of the input to the reference. For DAC outputs, the reference is normally the full-scale output. The accuracy of the reference sets the limit on the absolute accuracy of a given system. This can be critical in the measurement of devices such as thermocouples, in which the voltage output
relates directly to a given temperature. Current reference can also be used in ratio systems
and are often used to drive sensors that require a precision current.
Application Notes
- AN-849 : Using Op Amps as Comparators
- AN-729 : Evaluation Kit for the AD5254 Quad 256-Position I2C-Compatible Nonvolatile Memory Digital Potentiometer
- AN-728 : Evaluation Kit for the AD5253 64-Position I2C-Compatible Nonvolatile Memory Digital Potentiometer
- AN-649 : Using the Analog Devices Active Filter Design Tool
- AN-579 : Versatile Programmable Amplifiers Using Digital Potentiometers with Nonvolatile Memory
- 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-358 : Noise and Operational Amplifier Circuits
- AN-357 : Operational Integrators
- AN-356 : User's Guide to Applying and Measuring Operational Amplifier Specifications
- AN-256 : Accurately Testing Op Amp Settling Times
- AN-253 : Find Op Amp Noise with Spreadsheet
- AN-138 : SPICE-Compatible Op Amp Macro-Models
- AN-117 : OP-42 Advanced SPICE Macro-Model
- AN-106 : 06: A Collection of Amp Applications
Examines Some of the Numerous and Widely Used Applications of the Operational Amplifier
Technical Articles
- 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) - 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) - High-Voltage Monitor Features High Accuracy
... Article is on page 3 of PDF.
(Electronic Design, Ideas for Design, 8/19/2002)