AD5172

Features:

2-channel, 256-position
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 defined preset
End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Compact MSOP-10 (3 mm * 4.9 mm) package
Fast settling time: tS = 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)
Single supply 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/°C
Low power, IDD = 6 µA max
Wide operating temperature: 40°C to +125°C
Evaluation board and software are available
Software replaces µC in factory programming applications





Application

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
Automotive electronics adjustment
Gain control and offset adjustment




Pinout








Specifications

VDD to GND 0.3 V to +7 V
VA, VB, VW to GND VDD
Terminal Current, AxBx, AxWx, BxWx1
Pulsed±20 mA
Continuous ±5 mA
Digital Inputs and Output Voltage to GND0 V to 7 V
Operating Temperature Range 40°C to +125°C
Maximum Junction Temperature (TJMAX)150°C
Storage Temperature 65°C to +150°C
Lead Temperature (Soldering, 10 sec) 300°C
Thermal Resistance² : MSOP-10230°C/W




Description

The AD5172/AD5173 are dual channel, 256-position, one-time programmable (OTP) digital potentiometers¹ that employ fuse link technology to achieve memory retention of resistancesetting. 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. This device performs the same electronic adjustment function as mechanical potentiometers or variable resistors with enhanced resolution, solid-state reliability, and superior low temperature coefficient performance.

The AD5172/AD5173 are programmed using a 2-wire, I²Ccompatible 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 the fuse has been blown. However, the OTP setting is restored during subsequent power- up conditions. This feature allows users to treat these digital potentiometers as volatile potentiometers with a programmable preset.