Features and Benefits
- 2-channel, 256-position potentiometers
- 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.
- 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
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
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.
Features & 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
Documentation & Resources
AN-686: Implementing an I2C® Reset (Rev. 0)12/16/200344 kB
UG-243: Evaluation Board for the AD5172 Digital Potentiometer (Rev. 0)1/25/20110 M
Choosing the Correct digiPOT for Your Application6/7/2013311 K
Discrete- and Integrated Control of Power Amplifiers in Base-Station Applications4/1/2008 Analog Dialogue
Software & Systems Requirements
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Support & Discussions
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.