TUTORIAL 5036

Calibration Circuit Library

By:  Bill Laumeister, Strategic Applications Engineer
© Jun 10, 2011, Maxim Integrated Products, Inc.

Abstract: This application note discusses the some of the benefits of digital calibration and shows common calibration circuits by application.

Calibration makes products accurate, safe, and affordable. It allows manufacturers to deliver "perfect" devices at competitive prices. Maxim's large variety of digital calibration parts enables quick automated testing and adjustment.
These ideas are presented pictorially to save time and speed comprehension. Most engineers will spend a second or two on each block until one fits their application. They can then click on the diagram to jump to the source application note or datasheet for more information.
Electronic calibration can reduce cost in many areas. It can remove manufacturing tolerances, specify less-expensive components, reduce test time and customer returns, and improve reliability. It also increases customer satisfaction, lowers warranty costs, and speeds product delivery.
Digitally controlled calibration devices and potentiometers (pots) are replacing mechanical pots in many products. By removing human error, these parts reduce test time and expense. Additionally, digital devices are insensitive to vibration, dust, dirt, and moisture, which can cause failure in mechanical pots. The increased reliability can reduce product liability concerns and improve product safety. Furthermore, the small size of electronic calibration devices benefits small board layouts and portable devices.
This application note shows some of the more common calibration circuits by application. More calibration design tips and tools are available at www.maximintegrated.com/cal.

Calibration Circuits by Application

ADC

See application note 4617, "ADC Input Translator."

Amplifier Support

See application note 4348, "Minimize Voltage Offsets in Precision Amplifiers."

Current Source/Sink

See application note 4474, "4.096V, 80mA Precision Reference."

DAC

See application note 807, "Force/Sense DAC Applications."

Filter

LCD Bias

LED

Multiplexer

Power Supplies

See application note 4101, "Differentiating Digital Potentiometer Features."

Sensor Support

See application note 3426, "Resistive Bridge Basics: Part One."
See application note 807, "Force/Sense DAC Applications."

VCO

See application note 2095, "External Resistor Minimizes Digipot Loading."

Voltage Reference

See application note 3531, "How to Reduce Reference Noise by Half."

Reference

More calibration design tips and tools are available at www.maximintegrated.com/cal.

Related Parts
DS1841 Temperature-Controlled, NV, I²C, Logarithmic Resistor Free Samples  
DS1881 Dual NV Audio Taper Digital Potentiometer Free Samples  
DS3906 Triple NV Low Step Size Variable Resistor Plus Memory Free Samples  
DS3930 Hex Nonvolatile Potentiometer with I/O and Memory Free Samples  
DS4422 Two-/Four-Channel, I²C, 7-Bit Sink/Source Current DAC Free Samples  
MAX4539 Low-Voltage, Single 8 to 1 and Dual 4 to 1 Cal Multiplexers Free Samples  
MAX5331 12-Bit DACs with 32-Channel Sample-and-Hold Outputs Free Samples  
MAX5360 Low-Cost, Low-Power 6-Bit DACs with 2-Wire Serial Interface in SOT23 Package Free Samples  
MAX5380 Low-Cost, Low-Power, 8-Bit DACs with 2-Wire Serial Interface in SOT23 Free Samples  
MAX5389 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Free Samples  
MAX5427 32-Tap, One-Time Programmable, Linear-Taper Digital Potentiometers Free Samples  
MAX5436 ±15V, 128-Tap, Low-Drift Digital Potentiometers Free Samples  
MAX5481 10-Bit, Nonvolatile, Linear-Taper Digital Potentiometers Free Samples  
MAX5592 Buffered, Fast-Settling, Octal, 12/10/8-Bit, Voltage-Output DACs Free Samples  
MAX5732 32-Channel, 16-Bit, Voltage-Output DACs with Serial Interface Free Samples  
MAX5774 32-Channel, 14-Bit, Voltage-Output DACs with Serial Interface Free Samples  
MAX6008A 1µA SOT23 Precision Shunt Voltage Reference Free Samples  
MAX6176 High-Precision Voltage References with Temperature Sensor Free Samples  


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APP 5036: Jun 10, 2011
TUTORIAL 5036, AN5036, AN 5036, APP5036, Appnote5036, Appnote 5036