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AD5227BUJZ100-R2 Folha de dados(PDF) 1 Page - Analog Devices |
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AD5227BUJZ100-R2 Folha de dados(HTML) 1 Page - Analog Devices |
1 / 16 page 64-Position Up/Down Control Digital Potentiometer AD5227 Rev. B 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© 2004–2009 Analog Devices, Inc. All rights reserved. FEATURES 64-position digital potentiometer 10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance Simple up/down digital or manual configurable control Midscale preset Low potentiometer mode tempco = 10 ppm/°C Low rheostat mode tempco = 35 ppm/°C Ultralow power, IDD = 0.4 μA typ and 3 μA max Fast adjustment time, ts = 1 μs Chip select enable multiple device operation Low operating voltage, 2.7 V to 5.5 V Automotive temperature range, −40°C to +105°C Compact thin SOT-23-8 (2.9 mm × 3 mm) Pb-free package APPLICATIONS Mechanical potentiometer and trimmer replacements LCD backlight, contrast, and brightness controls Portable electronics level adjustment Programmable power supply Digital trimmer replacements Automatic closed-loop control FUNCTIONAL BLOCK DIAGRAM CS U/D CLK GND VDD 6-BIT UP/DOWN CONTROL LOGIC POR MIDSCALE WIPER REGISTER A W B AD5227 Figure 1. GENERAL DESCRIPTION The AD5227 is Analog Devices’ latest 64-step up/down control digital potentiometer1. This device performs the same electronic adjustment function as a 5 V potentiometer or variable resistor. Its simple 3-wire up/down interface allows manual switching or high speed digital control. The AD5227 presets to midscale at power-up. When CS is enabled, the devices changes step at every clock pulse. The direction is determined by the state of the U/D pin (see ). The interface is simple to activate by any host controller, discrete logic, or manually with a rotary encoder or pushbuttons. The AD5227’s 64-step resolution, small footprint, and simple interface enable it to replace mechanical potentiometers and trimmers with typically 6× improved resolution, solid-state reliability, and design layout flexibility, resulting in a considerable cost savings in end users’ systems. Table 1 1 The terms digital potentiometer and RDAC are used interchangeably. The AD5227 is available in a compact thin SOT-23-8 (TSOT-8) Pb-free package. The part is guaranteed to operate over the automotive temperature range of −40°C to +105°C. Users who consider EEMEM potentiometers should refer to some recommendations in the Applications section. Table 1. Truth Table CS CLK U/D Operation1 0 ↓ 0 RWB Decrement 0 ↓ 1 RWB Increment 1 X X No Operation 1 RWA increments if RWB decrements and vice versa. |
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