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AD5282:  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)2. 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 ...More

AD5282:  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)2. 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 applica-tions, 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

    • 1 Assert shutdown and program the device during power-up, then deassert the shutdown to achieve the desired preset level.
    2 The terms digital potentiometer, VR, and RDAC are used interchangeably.

    Data Sheet, Rev. C, 7/09

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    • AD5280: 1 channel
    • AD5282: 2 channels
    • 256 positions
    • +10 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
    • # Channels: 2
    • # Positions: 256
    • Memory Type: Volatile
    • Interface: I2C
    • Resistor Values (kOhms): 20, 50, 200
    • Bipolar Voltage Range (V): ±5V
    • Voltage Range (V): +15V
    • Supply Current : 0.1µA
    • Temp. Range -40 °C to..: 85Deg
    • Absolute Tempco (ppm/°C): 35ppm/C
    • Package: TSSOP

    AD5282 Functional Block Diagram

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    • Automotive: -40 to +125 degrees Celsius
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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.