AD5273:  64-Position, One-Time-Programmable (OTP) Digital Potentiometer

The AD5273 is a 64-position, one-time programmable (OTP) digital potentiometer4 that employs fuse link technology to achieve permanent program setting. This device performs the same ...More

AD5273:  64-Position, One-Time-Programmable (OTP) Digital Potentiometer

Product Description

The AD5273 is a 64-position, one-time programmable (OTP) digital potentiometer4 that employs fuse link technology to achieve permanent program setting. This device performs the same electronic adjustment function as most mechanical trimmers and variable resistors. It allows unlimited adjustments before permanently setting the resistance values. The AD5273 is programmed using a 2-wire, I2C®-compatible digital control. During write mode, a fuse blow command is executed after the final value is determined, thereby freezing the wiper position at a given setting (analogous to placing epoxy on a mechanical trimmer). When the permanent setting is achieved, the value does not change, regardless of the supply variations or environ-mental stresses under normal operating conditions. To verify the success of permanent programming, Analog Devices, Inc., patterned the OTP validation such that the fuse status can be discerned from two validation bits in the read mode.

In addition, for applications that program the AD5273 at the factory, Analog Devices offers device programming software2 running on Windows® NT®, Windows 2000, and Windows XP operating systems. This software application effectively replaces any external I2C controllers, which in turn enhances the user system’s time-to-market.p>

The AD5273 is available in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ resistances and in a compact 8-lead SOT-23 standard package. It operates from −40°C to +105°C.

Along with its unique OTP feature, the AD5273 lends itself well to general digital potentiometer applications due to its effective resolution, array resistance options, small footprint, and low cost.

An AD5273 evaluation kit and software are available. The kit includes the connector and cable that can be converted for factory programming applications.

For applications that require dynamic adjustment of resistance settings with nonvolatile EEMEM, users should refer to the AD523x and AD525x families of nonvolatile memory digital potentiometers.

Applications

  • System calibrations
  • Electronics level settings
  • Mechanical potentiometers and trimmer replacement
  • Automotive electronics adjustments
  • Transducer circuit adjustments
  • Programmable filters up to 6 MHz BW3

    • 1 OTP allows unlimited adjustments before permanent setting.
    2 Analog Devices cannot guarantee the software to be 100% compatible to all systems due to the wide variation in computer configurations.
    3 Applies to 1 kΩ parts only.
    4 The terms digital potentiometer, VR, and RDAC are used interchangeably.

    Data Sheet, Rev. G, 7/08

    Features

    • 64 positions
    • One-time programmable (OTP)1 set-and-forget Resistance setting—low cost alternative over EEMEM Unlimited adjustments prior to OTP activation
    • 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance
    • Compact 8-lead SOT-23 standard package
    • Ultralow power: IDD = 5 μA maximum
    • Fast settling time: tS = 5 μs typical during power-up
    • I2C-compatible digital interface
    • See Data Sheet for Additional Information

    Diagrams

    AD5273 Diagram
    Functional Block Diagram for AD5273

    Specifications

    # Channels 1
    # Positions 64
    Memory Type One Time Programmable
    Interface I2C
    Resistor Values (kOhms) 1, 10, 50, 100
    Voltage Range (V) +5.5V
    Supply Current (max) 0.1µA
    Temp. Range -40 °C to.. 105Deg
    Absolute Tempco (ppm/°C) 300ppm/C
    Package SOT-23

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