MAX5478

Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers

Industry's Smallest, Dual, 256-Tap Digital Potentiometers Fit in 3mm x 3mm TQFN


Please check latest availability status for a specific part variant.

Description

The MAX5477/MAX5478/MAX5479 nonvolatile, dual, linear-taper, digital potentiometers perform the function of a mechanical potentiometer, but replace the mechanics with a simple 2-wire 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. A write-protect feature prevents accidental overwrites of the EEPROM. The fast-mode I²C-compatible serial interface allows communication at data rates up to 400kbps, minimizing board space and reducing interconnection complexity in many applications. Three address inputs allow a total of eight unique address combinations.

The MAX5477/MAX5478/MAX5479 provide three nominal resistance values: 10kΩ (MAX5477), 50kΩ (MAX5478), or 100kΩ (MAX5479). The nominal resistor temperature coefficient is 70ppm/°C end-to-end and 10ppm/°C ratiometric. The low temperature coefficient makes the devices ideal for applications requiring a low temperature- coefficient variable resistor, such as low drift, programmable gain-amplifier circuit configurations.

The MAX5477/MAX5478/MAX5479 are available in 16-pin 3mm x 3mm x 0.8mm TQFN and 14-pin 4.4mm x 5mm TSSOP packages. These devices operate over the extended -40°C to +85°C temperature range.
MAX5477, MAX5478, MAX5479: Functional Diagram MAX5477, MAX5478, MAX5479: Functional Diagram Enlarge+

Key Features

  • Power-On Recall of Wiper Position from Nonvolatile Memory
  • EEPROM Write Protection
  • Tiny 3mm x 3mm x 0.8mm Thin QFN Package
  • 70ppm/°C End-to-End Resistance Temperature Coefficient
  • 10ppm/°C Ratiometric Temperature Coefficient
  • Fast 400kbps I²C-Compatible Serial Interface
  • 1µA (max) Static Supply Current
  • Single-Supply Operation: +2.7V to +5.25V
  • 256 Tap Positions per Potentiometer
  • ±0.5 LSB DNL in Voltage-Divider Mode
  • ±1 LSB INL in Voltage-Divider Mode

Applications/Uses

  • Liquid-Crystal Display (LCD) Contrast Control
  • Low-Drift Programmable-Gain Amplifiers
  • Mechanical Potentiometer Replacements
  • Volume Control
Part NumberTaperPOTsControl InterfaceWiper MemoryStepsREND-TO-END
(kΩ)
Res. Tol.
(%)
Temp. Coeff.
(ppm/°C)
Wiper Resistance
(Ω)
ICC @5V
(µA)
Package/PinsBudgetary
Price
typtypmaxSee Notes
MAX5477 Linear22-Wire SerialNon-Volatile2561025353251
TQFN/16
TSSOP/14
$1.89 @1k
MAX5478 50
TQFN/16
TSSOP/14
MAX5479 100
TQFN/16
TSSOP/14
See All Digital Potentiometers (124)
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.


MAX5478EVCMODU: Evaluation Kit/Evaluation System for the MAX5477, MAX5478, and MAX5479
MAX5478EVKIT: Evaluation Kit/Evaluation System for the MAX5477, MAX5478, and MAX5479

Technical Documents

App Note 4051 Using an Analog Voltage to Control a Digital Potentiometer
App Note 3996 Logging the Linear Digital Potentiometer

Quality and Environmental Data

Product Reliability Reports: MAX5478.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX5478ETE
  • MAX5478ETE#G16
  • MAX5478ETE#TG16
  • MAX5478ETE+
  • MAX5478ETE+T
  • MAX5478ETE-T
  • MAX5478EUD+
  • MAX5478EUD+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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.

    Quality Management System >
    Environmental Management System >

     
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