Data Sheet

AD5172/AD5173

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

Rev. J

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FEATURES

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2-channel, 256-position potentiometers

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One-time programmable (OTP) set-and-forget resistance setting

provides a low cost alternative to EEMEM

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Unlimited adjustments before OTP activation

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OTP overwrite allows dynamic adjustments with user defined

preset

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End-to-end resistance: 2.5 kΩ, 10 kΩ, and 100 kΩ

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Compact 10-lead MSOP: 3 mm × 4.9 mm

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Fast settling time: tS = 5 µs typical on power-up

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Full read/write of wiper register

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Power-on preset to midscale

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Extra package address decode pins: AD0 and AD1 (AD5173)

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Single supply: 2.7 V to 5.5 V

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Low temperature coefficient: 35 ppm/°C

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Low power: IDD = 6 µA maximum

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Wide operating temperature: −40°C to +125°C

APPLICATIONS

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Systems calibration

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Electronics level setting

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Mechanical trimmers replacement in new designs

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Permanent factory PCB setting

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Transducer adjustment of pressure, temperature, position, chem-

ical, and optical sensors

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RF amplifier biasing

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Gain control and offset adjustment

FUNCTIONAL BLOCK DIAGRAMS

Figure 1. AD5172 Functional Block Diagram

Figure 2. AD5173 Functional Block Diagram

GENERAL DESCRIPTION

The AD5172/AD5173 are dual-channel, 256-position, one-time pro-

grammable (OTP) digital potentiometers that employ fuse link tech-

nology to achieve memory retention of resistance settings. The digi-

tal 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-compat-

ible digital interface. Unlimited adjustments are allowed before

permanently setting the resistance value. During OTP activation,

a permanent blow fuse command freezes the wiper position (analo-

gous 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.