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Electronic calibration of equipment is reliable, cost effective, and flexible. To make design-in easier, Maxim offers DACs, digital potentiometers (pots), and voltage references specifically optimized for calibration applications. We have example circuits and application notes for electronic calibration.

Calibration Parts

A calibration part is an adjustable device with a predictable power-on-reset (POR) condition. Usually POR will read a value stored in nonvolatile (NV) memory in the device. Alternative devices that POR to zero, midscale, or full-scale can also be used in selected circuits. Maxim adds a C to signify calibration before a common acronym. Thus, CDPot is a calibration digital pot. CDAC is a calibration digital-to-analog converter. A CRef is a calibration voltage reference.

Digital Pots for Calibration

DACs for Calibration

VREFs for Calibration



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MAX5725 Ultra-Small, Octal-Channel, 8-/10-/12-Bit Buffered Output DACs with Internal Reference and SPI Interface

The MAX5723/MAX5724/MAX5725 8-channel, low-power, 8-/10-/12-bit, voltage-output digital-to-analo...
  • Eight High-Accuracy DAC Channels
    • 12-Bit Accuracy Without Adjustment
    • ±1 LSB INL Buffered Voltage Output
    • Guaranteed Monotonic Over All Operating Conditions
    • Independent Mode Settings for Each DAC
  • Three Precision Selectable Internal References
    • 2.048V, 2.500V, or 4.096V
  • Internal Output Buffer
    • Rail-to-Rail Operation with External Reference
    • 4.5µs Settling Time
    • Outputs Directly Drive 2kΩ Loads
  • Small 6.5mm × 4.4mm 20-Pin TSSOP or Ultra-Small 2.5mm × 2.3mm 20-Bump WLP Package
  • Wide 2.7V to 5.5V Supply Range
  • Separate 1.8V to 5.5V VDDIO Power-Supply Input
  • Fast 50MHz 4-Wire SPI/QSPI/MICROWIRE/DSP-Compatible Serial Interface
  • Programmable Interface Watchdog Timer
  • Pin-Selectable Power-On-Reset to Zero-Scale or Midscale DAC Output
  • Active-Low LDAC and Active-Low CLR for Asynchronous DAC Control
  • Three Selectable Power-Down Output Impedances
    • 1kΩ, 100kΩ, or High Impedance
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DS4305 Electronically Programmable Voltage Reference

The DS4305 is a nonvolatile (NV) electronically programmable voltage reference. The reference vo...
  • Precise Electronically Adjustable Voltage Reference
  • Enables Automated Factory Trimming of Devices Needing Voltage Adjustment
  • Can be Adjusted to Within ±1.5mV
  • Wide Adjustable Output Voltage Range Within 300mV of the Supply Rails
  • Low Temperature Coefficient
  • ±1mA of Output-Current Drive
  • NV Memory Stores the Voltage Indefinitely
  • Output Short-Circuit Protection
  • Low Cost
  • Low Power Consumption
  • 4.0V to 5.5V Single-Supply Operation
  • Small 5-Lead SOT23 Package
  • -40°C to +125°C Temperature Operation
  • DS4305K Evaluation Kit is Available
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DS3901 Triple, 8-Bit NV Variable Resistor with Dual Settings and User EEPROM

The DS3901 is a triple, 8-bit nonvolatile (NV) variable resistor. Each of the resistors has two ...
  • Three 256-Position Linear Digital Resistors
  • Full-Scale Resistances 50kΩ, 30kΩ, 20kΩ
  • Dual NV Settings for Each Resistor
  • Low Temperature-Coefficient Resistors
  • I²C Serial Interface
  • Wide Operating Voltage (2.4V to 5.5V)
  • Two-Level Password Write Protection
  • 232 Bytes of User EEPROM
  • Programmable Slave Address
  • -40°C to +95°C Operating Temperature Range
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MAX5496 10-Bit, Dual, Nonvolatile, Linear-Taper Digital Potentiometers

The MAX5494–MAX5499 10-bit (1024-tap), dual, nonvolatile, linear-taper, programmable voltage-div...
  • Wiper Position Stored in Nonvolatile Memory and Recalled Upon Power-Up
  • 16-Pin, 5mm x 5mm x 0.8mm TQFN Package
  • 35ppm/°C End-to-End Resistance Temperature Coefficient
  • 5ppm/°C Ratiometric Temperature Coefficient
  • 10kΩ and 50kΩ End-to-End Resistor Values
  • 3-Wire SPI-Compatible Serial Interface
  • Reliability (TA = +85°C)
    • 50,000 Wiper Store Cycles
    • 50 Years Wiper Data Retention
  • 1.5µA (max) Standby Current
  • Single +2.7V to +5.25V Supply Operation
  • Dual ±2.5V Supply Operation
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MAX6220 Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference

The MAX6220 is a low-noise, precision voltage reference with extremely low 20ppm/°C temperature ...
  • Low 20ppm/°C Temperature Coefficient over -40°C to +125°C Range
  • Very Low 1.5µVp-p Noise (0.1Hz to 10Hz)
  • ±0.1% Initial Accuracy
  • ±15mA Output Source and Sink Current
  • 8V to 40V Input Voltage Range
  • Optional Noise Reduction and Voltage Trim
  • Excellent Transient Response
  • Low 20ppm/1000hr Long-Term Stability
  • Stable for All Capacitive Loads
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