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AD5172 Dataheets PDF



Part Number AD5172
Manufacturers Analog Devices
Logo Analog Devices
Description Dual-Channel I2C Digital Potentiometers
Datasheet AD5172 DatasheetAD5172 Datasheet (PDF)

Data Sheet AD5172/AD5173 256-Position, One-Time Programmable, Dual-Channel, I2C Digital Potentiometers FEATURES ► 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 typica.

  AD5172   AD5172


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Data Sheet AD5172/AD5173 256-Position, One-Time Programmable, Dual-Channel, I2C Digital Potentiometers FEATURES ► 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 APPLICATIONS ► Systems calibration ► Electronics level setting ► Mechanical trimmers replacement in new designs ► Permanent factory PCB setting ► Transducer adjustment of pressure, temperature, position, chem- ical, and optical sensors ► RF amplifier biasing ► Gain control and offset adjustment GENERAL DESCRIPTION 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). FUNCTIONAL BLOCK DIAGRAMS Figure 1. AD5172 Functional Block Diagram Figure 2. AD5173 Functional Block Diagram 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. Rev. J DOCUMENT FEEDBACK TECHNICAL SUPPORT Information furnished by Analog Devices is believed to be accurate and reliable "as is". 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. 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 registered trademarks are the property of their respective owners. Data Sheet TABLE OF CONTENTS Features................................................................ 1 Applications........................................................... 1 Functional Block Diagrams....................................1 General Description...............................................1 Specifications........................................................ 3 Electrical Characteristics: 2.5 kΩ....................... 3 Electrical Characteristics: 10 kΩ and 100 kΩ ....4 Timing Characteristics........................................6 Absolute Maximum Ratings...................................7 ESD Caution.......................................................7 Pin Configurations and Function Descriptions.......8 Typical Performance Characteristics..................... 9 Test Circuits......................................................... 13 Theory of Operation.............................................14 One-Time Programming (OTP)........................ 14 Programming the Variable Resistor and Voltage........................................................... 14 AD5172/AD5173 Programming the Potentiometer Divider.......... 15 ESD Protection.................................................15 Terminal Voltage Operating Range.................. 16 Power-Up Sequence........................................ 16 Power Supply Considerations.......................... 16 Layout Considerations......................................16 I2C Interface.........................................................17 Write Mode....................................................... 17 Read Mode.......................................................17 SDA Bits Descriptions...................................... 17 I2C Controller Programming............................. 17 I2C-Compatible, 2-Wire Serial Bus...................19 Level Shifting for Different Voltage Operation.. 20 .


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