AD5292 Digital Potentiometer
Analog Devices' AD5292 enables a new level of precision calibration in industrial systems
ADI's introduces a digital potentiometer (DigiPot) with one of the industry's best resistor tolerances, allowing designers of industrial and instrumentation equipment to meet tighter resistor matching requirements for improved system accuracy. In industrial control systems, medical instrumentation, and other devices that require finely tuned gain and offset control, power supply calibration or volume control; the tighter resistor matching provided by the new DigiPots allows engineers to set the range with greater accuracy resulting in more precise system controls.
Designed for open-loop applications and systems that demand precision calibration and tolerance matching, the AD5292 consists of three single-channel, 10-bit programmable DigiPOTs that feature less than one percent end-to-end resistor tolerance (RTol) error over a wide ±15 V supply range. The best-in-class resistor matching of the AD5292 allows users to take full advantage of up to 1024 tap adjustments to more precisely adjust and trim electronic circuits for improved overall system performance.
The AD5292 is manufactured on Analog Devices iCMOS® (industrial CMOS) modular manufacturing process, which combines high-voltage CMOS and bipolar technologies to enable the device to support dual power supplies in the ±10.5 V to ±16.5 V range and single supply operation in the 21 V to 33 V range. The 1024-tap AD5292 digiPot features a 20-times-programmable memory. The wiper setting of these two devices is controlled through an SPI (serial peripheral interface)-compatible port. An internal fuse is blown to permanently save the wiper position. Triggered by a simple software command, no external power supply is required to program the device, saving cost and PCB area.
Features
- Single-channel, 256- and 1024-position resolution
- 20 kΩ nominal resistance
- Calibrated ±1% nominal resistor tolerance (resistor performance mode)
- 20-time programmable (20-TP) set-and-forget resistance setting allows multiple time permanent programming
- Rheostat mode temperature coefficient: 35 ppm/°C
- Voltage divider temperature coefficient: 5 ppm/°C
- +21 V -> +33 V single-supply operation
- ±10.5 V -> ±16.5 V dual-supply operation
- SPI-compatible serial interface
- Wiper setting readback
- Power-on refreshed from 20-TP memory
Applications
- Instrumentation: gain and offset adjustment
- Programmable voltage-to-current conversion
- Programmable filters, delays, and time constants
- Programmable power supply
- Low resolution DAC replacement
- Sensor calibration
发布日期: 2012-07-17