AD5172

PRODUCTION

256-Position, One-Time Programmable, Dual Channel, I2C Digital Potentiometer

Data Sheet (Rev. K) Product Selection Table
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Overview

  • 2-channel, 256-position potentiometers
  • One-time programmable (OTP) set-and-forget resistance setting provides a low cost alternative to EEMEM
  • Unlimited adjustments before OTP activation
  • OTP overwrite allows dynamic adjustments with user defined preset
  • End-to-end resistance: 2.5 kΩ, 10 kΩ, and 100 kΩ
  • Compact 10-lead MSOP: 3 mm × 4.9 mm
  • Fast settling time: tS = 5 µs typical on power-up
  • Full read/write of wiper register
  • Power-on preset to midscale
  • Extra package address decode pins: AD0 and AD1 (AD5173)
  • Single supply: 2.7 V to 5.5 V
  • Low temperature coefficient: 35 ppm/°C
  • Low power: IDD = 6 µA maximum
  • Wide operating temperature: −40°C to +125°C

The AD5172 / AD5173 are dual-channel, 256-position, one-time programmable (OTP) digital potentiometers that employ fuse link technology to achieve memory retention of resistance settings. The digital potentiometer, VR, and RDAC terms are used interchangeably. OTP is a cost-effective alternative to EEMEM for users who do not need to program the digital potentiometer setting in memory more than once. These devices perform the same electronic adjustment function as mechanical potentiometers or variable resistors but with enhanced resolution, solid-state reliability, and superior low temperature coefficient performance.

TheAD5172 / AD5173 are programmed using a 2-wire, I2C-compatible digital interface. Unlimited adjustments are allowed before permanently setting the resistance value. During OTP activation, a permanent blow fuse command freezes the wiper position (analogous to placing epoxy on a mechanical trimmer).

Unlike traditional OTP digital potentiometers, the AD5172 / AD5173 have a unique temporary OTP overwrite feature that allows for new adjustments even after a fuse is blown. However, the OTP setting is restored during subsequent power-up conditions. This allows users to treat these digital potentiometers as volatile potentiometers with a programmable preset.

APPLICATIONS

  • Systems calibration
  • Electronics level setting
  • Mechanical trimmers replacement in new designs
  • Permanent factory PCB setting
  • Transducer adjustment of pressure, temperature, position, chemical, and optical sensors
  • RF amplifier biasing
  • Gain control and offset adjustment
AD5172
256-Position, One-Time Programmable, Dual Channel, I2C Digital Potentiometer
AD5172 Functional Block Diagram AD5172 Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Application Note 1

Frequently Asked Question 1

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Software Resources

Device Drivers 2

Hardware Ecosystem

Parts Product Life Cycle Description
AD5142A
PRODUCTION Dual Channel, 256-Position, I2C, Nonvolatile Digital Potentiometer
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Evaluation Kits

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EVAL-AD5172

AD5172 Evaluation Board

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Features and Benefits

  • Full-featured evaluation board for the AD5172
  • Various test circuits
  • Various ac/dc input signals
  • PC control via a separately purchased system development platform (SDP)
  • PC software for control
  • Resistor tolerance error stored in EEMEM

Product Details

The AD5172 supports a single-supply 2.7 V to 5.5 V operation, making the device suited for battery-powered applications and many other applications with a superior low temperature coefficient performance.

The on-board socket allows the user to easily replace the device for reprogramming of the OTP memory.

In addition, the AD5172 uses a versatile I2C serial interface that operates in fast mode, allowing speeds of up to 400 kHz.

The EVAL-AD5172SDZ can operate in single-supply mode and incorporates an internal power supply from the USB.

Complete specifications for the AD5172 part can be found in the AD5172 data sheet.
EVAL-AD5172
AD5172 Evaluation Board
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