256-Tap, Nonvolatile, SPI-Interface, Digital Potentiometers

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The MAX5422/MAX5423/MAX5424 nonvolatile, lineartaper, digital potentiometers perform the function of a mechanical potentiometer, but replace the mechanics with a simple 3-wire SPI™-compatible digital interface. Each device performs the same function as a discrete potentiometer or variable resistor and has 256 tap points.

The devices feature an internal, nonvolatile EEPROM used to store the wiper position for initialization during power-up. The 3-wire SPI-compatible serial interface allows communication at data rates up to 5MHz, minimizing board space and reducing interconnection complexity in many applications.

The MAX5422/MAX5423/MAX5424 provide three nominal resistance values: 50kΩ (MAX5422), 100kΩ (MAX5423), or 200kΩ (MAX5424). The nominal resistor temperature coefficient is 35ppm/°C end-to-end and only 5ppm/°C ratiometric. This makes the devices ideal for applications requiring a low-temperature-coefficient variable resistor, such as low-drift, programmable gainamplifier circuit configurations.

The MAX5422/MAX5423/MAX5424 are available in a 3mm x 3mm 8-pin TDFN package, and are specified over the extended -40°C to +85°C temperature range.

MAX5422, MAX5423, MAX5424: Functional Diagram MAX5422, MAX5423, MAX5424: Functional Diagram Enlarge+

Key Features

  • Wiper Position Stored in Nonvolatile Memory (EEPROM) and Recalled Upon Power-Up or Interface Command
  • 3mm x 3mm x 0.8mm TDFN Package
  • 35ppm/°C End-to-End Resistance Temperature Coefficient
  • 5ppm/°C Ratiometric Temperature Coefficient
  • 50kΩ, 100kΩ, and 200kΩ Resistor Values
  • 5MHz SPI-Compatible Serial Interface
  • 500nA (typ) Static Supply Current
  • Single-Supply Operation: +2.7V to +5.25V
  • 256 Tap Positions
  • ±0.5 LSB DNL in Voltage-Divider Mode
  • ±0.5 LSB INL in Voltage-Divider Mode


  • Audio Volume Control
  • Liquid-Crystal Display (LCD) Contrast Control
  • Low-Drift Programmable Filters
  • Low-Drift Programmable-Gain Amplifiers
  • Mechanical Potentiometer Replacements

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX5422EVKIT: Evaluation Kit for the MAX5422, MAX5423, and MAX5424

Technical Documents

App Note 3996 Logging the Linear Digital Potentiometer
Reference Schematic 2398 3V DACs Used in ±10V Applications
Product Reliability Reports: MAX5423.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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