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AD5243BRM10 Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD5243BRM10 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 20 page Dual 256-Position I2C Compatible Digital Potentiometer AD5243/AD5248 Rev. 0 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. 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES 2-channel, 256-position End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ Compact MSOP-10 (3 mm × 4.9 mm) package Fast settling time: tS = 5 µs typ on power-up Full read/write of wiper register Power-on preset to midscale Extra package address decode pins AD0 and AD1 (AD5248 only) Computer software replaces µC in factory programming applications 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 available APPLICATIONS Systems calibrations Electronics level settings 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 FUNCTIONAL BLOCK DIAGRAMS A1 VDD GND SDA SCL W1 WIPER REGISTER 1 PC INTERFACE AD5243 B1 A2 W2 WIPER REGISTER 2 B2 Figure 1. AD5243 VDD GND SDA SCL AD0 AD1 W1 RDAC REGISTER 1 ADDRESS DECODE SERIAL INPUT REGISTER AD5248 B1 W2 RDAC REGISTER 2 B2 / 8 Figure 2. AD5248 GENERAL DESCRIPTION The AD5243 and AD5248 provide a compact 3 mm × 4.9 mm packaged solution for dual 256-position adjustment applica- tions. These devices perform the same electronic adjustment function as a 3-terminal mechanical potentiometer (AD5243) or a 2-terminal variable resistor (AD5248). Available in four different end-to-end resistance values (2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ), these low temperature coefficient devices are ideal for high accuracy and stability variable resistance adjustments. The wiper settings are controllable through the I2C compatible digital interface. The AD5248 has extra package address decode pins AD0 and AD1, allowing multiple parts to share the same I2C 2-wire bus on a PCB. The resistance between the wiper and either endpoint of the fixed resistor varies linearly with respect to the digital code transferred into the RDAC latch.1 Operating from a 2.7 V to 5.5 V power supply and consuming less than 6 µA allows for usage in portable battery-operated applications. For applications that program the AD5243/AD5258 at the factory, Analog Devices offers device programming software running on Windows® NT/2000/XP operating systems. This software effectively replaces any external I2C controllers, which in turn enhances users’ systems time-to-market. An AD5243/ AD5248 evaluation kit and software are available. The kit includes a cable and instruction manual. 1The terms digital potentiometer, VR, and RDAC are used interchangeably. |
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