AD5280:  Single/Dual, +15 V/±5 V, 256-Position, I2C-Compatible Digital Potentiometer

The AD5280/AD5282 are single-channel and dual-channel, 256-position, digitally controlled variable resistors (VRs)*. The devices perform the same electronic adjustment function as a ...More

AD5280:  Single/Dual, +15 V/±5 V, 256-Position, I2C-Compatible Digital Potentiometer

Product Description

The AD5280/AD5282 are single-channel and dual-channel, 256-position, digitally controlled variable resistors (VRs)*. The devices perform the same electronic adjustment function as a potentiometer, trimmer, or variable resistor. Each VR offers a completely programmable value of resistance between the A terminal and the wiper or the B terminal and the wiper. The fixed A-to-B terminal resistance of 20 kΩ, 50 kΩ, or 200 kΩ has a 1% channel-to-channel matching tolerance. The nominal temperature coefficient of both parts is 30 parts per million/ degrees centigrade (ppm/°C). Another key feature is that the parts can operate up to +15 V or ±5 V.

Wiper position programming defaults to midscale at system power-on. When powered, the VR wiper position is programmed by an I2C-compatible, 2-wire serial data interface. The AD5280/ AD5282 feature sleep mode programmability. This allows any level of preset in power-up and is an alternative to a costly EEPROM solution. Both parts have additional programmable logic outputs that enable users to drive digital loads, logic gates, LED drivers, and analog switches in their system.

The AD5280/AD5282 are available in thin, surface-mounted 14-lead TSSOP and 16-lead TSSOP. All parts are guaranteed to operate over the extended industrial temperature range of −40°C to +85°C. For 3-wire SPI-compatible interface applications, see the AD5260/AD5262 product information on www.analog.com.

Applications

  • Multimedia, video, and audio
  • Communications
  • Mechanical potentiometer replacement
  • Instrumentation: gain, offset adjustment
  • Programmable voltage source
  • Programmable current source
  • Line impedance matching

    • * The terms digital potentiometer, VR, and RDAC are used interchangeably.

    Data Sheet, Rev. B, 8/07

    Features

    • AD5280: 1 channel
    • AD5282: 2 channels
    • 256 positions
    • 5 V to 15 V single supply; ±5.5 V dual-supply operation
    • Fixed terminal resistance: 20 kΩ, 50 kΩ,
      200 kΩ
    • Low temperature coefficient: 30 ppm/°C
    • Power-on midscale preset1
    • Programmable reset
    • Operating temperature: −40°C to +85°C
    • I2C-compatible interface

    1 Assert shutdown and program the device during power-up, then deassert the shutdown to achieve the desired preset level.

    Diagrams

    AD5280 Diagram
    Functional Block Diagram for AD5280

    Specifications

    # Channels 1
    # Positions 256
    Memory Type Volatile
    Interface I2C
    Resistor Values (kOhms) 20, 50, 200
    Bipolar Voltage Range (V) ±5V
    Voltage Range (V) +15V
    Supply Current (max) 0.1µA
    Temp. Range -40 °C to.. 85Deg
    Absolute Tempco (ppm/°C) 35ppm/C
    Package TSSOP

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