AD5172 AD5173 256-Position One-Time Programmable Dual-Channel I 2 C Digital Potentiometers Data Sheet Owner's Manual

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

AD5172/AD5173

FEATURES FUNCTIONAL BLOCK DIAGRAMS 2-channel, 256-position A1 W1 B1 A2 W2 B2

OTP (one-time programmable) set-and-forget resistance setting, low cost alternative to EEMEM Unlimited adjustments prior to OTP activation OTP overwrite allows dynamic adjustments with user

VDD FUSE

defined preset

LINKS

End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ

Compact MSOP-10 (3 mm × 4.9 mm) package RDAC RDAC

REGISTER 1 REGISTER 2

Fast settling time: t S = 5 µs typ in power-up Full read/write of wiper register Power-on preset to midscale Extra package address decode pins AD0 and AD1 (AD5173) SDA

SERIAL INPUT Single supply 2.7 V to 5.5 V SCL REGISTER

Low temperature coefficient: 35 ppm/°C

Figure 1. AD5172

Low power, IDD = 6 µA max Wide operating temperature: –40°C to +125°C W1 B1 W2 B2 Evaluation board and software are available Software replaces µC in factory programming applications

APPLICATIONS Systems calibration FUSE

LINKS

Electronics level setting Mechanical Trimmers® replacement in new designs

RDAC RDAC

Permanent factory PCB setting REGISTER 1 REGISTER 2

Transducer adjustment of pressure, temperature, position, chemical, and optical sensors AD0

ADDRESS AD1 DECODE

RF amplifier biasing Automotive electronics adjustment

SERIAL INPUT

Gain control and offset adjustment

SCL REGISTER

GENERAL OVERVIEW

Figure 2. AD5173

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

Unlike traditional OTP digital potentiometers, the AD5172/

programmable (OTP) digital potentiometers1 that employ fuse

3- 0- AD5173 have a unique temporary OTP overwrite feature that 3- 0-

link technology to achieve memory retention of resistance

allows for new adjustments even after the fuse has been blown.

setting. OTP is a cost-effective alternative to EEMEM for users

However, the OTP setting is restored during subsequent power-

who do not need to program the digital potentiometer setting in

up conditions. This feature allows users to treat these digital

memory more than once. This device performs the same elec-

potentiometers as volatile potentiometers with a programmable

tronic adjustment function as mechanical potentiometers or

preset.

variable resistors with enhanced resolution, solid-state reliabil- ity, and superior low temperature coefficient performance. For applications that program the AD5172/AD5173 at the

factory, Analog Devices offers device programming software

The AD5172/AD5173 are programmed using a 2-wire, I2C

running on Windows® NT®, 2000, and XP® operating systems.

compatible digital interface. Unlimited adjustments are allowed

This software effectively replaces any external I2C controllers,

before permanently setting the resistance value. During OTP

thus enhancing the time-to-market of the user’s systems.

activation, a permanent blow fuse command freezes the wiper position (analogous to placing epoxy on a mechanical trimmer). 1The terms digital potentiometer, VR, and RDAC are used interchangeably.

Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.

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Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and Tel: 781.329.4700 www.analog.com registered trademarks are the property of their respective owners. Fax: 781.326.8703 © 2003 Analog Devices, Inc. All rights reserved.