MAX5478:Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers

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

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.

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
MAX5477, MAX5478, MAX5479: Functional Diagram
MAX5477, MAX5478, MAX5479: Functional Diagram
Applications/Uses
  • Liquid-Crystal Display (LCD) Contrast Control
  • Low-Drift Programmable-Gain Amplifiers
  • Mechanical Potentiometer Replacements
  • Volume Control
DataSheet
titleDownload file
MAX5477-MAX5479 Data SheetMAX5477-MAX5479.pdf
Parametrics
Part NumberTaperPOTsControl InterfaceWiper MemoryStepsREND-TO-END
(kΩ)
Res. Tol.
(%)
Temp. Coeff.
(ppm/°C)
Wiper Resistance
(Ω)
ICC @5V
(µA)
Package/PinsBudgetary
Price
typtypmaxSee Notes
MAX5477Linear22-Wire SerialNon-Volatile2561025353251TQFN/16
TSSOP/14
$1.89 @1k
MAX547850TQFN/16
TSSOP/14
MAX5479100TQFN/16
TSSOP/14
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX5422:256-Tap, Nonvolatile, SPI-Interface, Digital Potentiometers
  • MAX5417:256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers
  • MAX5419:256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX5478ETENo Longer AvailableMAX5478ETE+TQFN,;16 pin;9.6 mm²-40°C to +85°CNo
MAX5478ETE#G16No Longer AvailableMAX5478ETE+TQFN,;16 pin;9.6 mm²-40°C to +85°CNo
MAX5478ETE#TG16No Longer AvailableMAX5478ETE+TQFN,;16 pin;9.6 mm²-40°C to +85°CNo
MAX5478ETE+ActiveTQFN,;16 pin;9.6 mm²-40°C to +85°CLead Free
MAX5478ETE+TActiveTQFN,;16 pin;9.6 mm²-40°C to +85°CLead Free
MAX5478ETE-TNo Longer AvailableMAX5478ETE+TTQFN,;16 pin;9.6 mm²-40°C to +85°CNo
MAX5478EUDNo Longer AvailableMAX5478EUD+TSSOP,;14 pin;33.4 mm²-40°C to +85°CNo
MAX5478EUD+ActiveTSSOP,;14 pin;33.4 mm²-40°C to +85°CLead Free
MAX5478EUD+TActiveTSSOP,;14 pin;33.4 mm²-40°C to +85°CLead Free
MAX5478EUD-TNo Longer AvailableMAX5478EUD+TTSSOP,;14 pin;33.4 mm²-40°C to +85°CNo
MAX5477-MAX5479.pdf MAX5479
MAX5477-MAX5479_cn.pdf MAX5479
MAX5478.pdf MAX5478
MAX5477-MAX5479_cn.pdf MAX5477