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AD5228BUJZ10-R2 データシート(PDF) 1 Page - Analog Devices |
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AD5228BUJZ10-R2 データシート(HTML) 1 Page - Analog Devices |
1 / 20 page 32-Position Manual Up/Down Control Potentiometer AD5228 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 32-position digital potentiometer 10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance Simple manual up/down control Self-contained, requires only 2 pushbutton tactile switches Built-in adaptive debouncer Discrete step-up/step-down control Autoscan up/down control with 4 steps per second Pin-selectable zero-scale/midscale preset Low potentiometer mode tempco, 5 ppm/°C Low rheostat mode tempco, 35 ppm/°C Digital control compatible Ultralow power, IDD = 0.4 µA typ and 3 µA max 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 Digital volume control Portable device-level adjustments Electronic front panel-level controls Programmable power supply GENERAL DESCRIPTION The AD5228 is Analog Devices’ latest 32-step-up/step-down control digital potentiometer emulating mechanical potenti- ometer operation1. Its simple up/down control interface allows manual control with just two external pushbutton tactile switches. The AD5228 is designed with a built-in adaptive debouncer that ignores invalid bounces due to contact bounce commonly found in mechanical switches. The debouncer is adaptive, accommodating a variety of pushbutton tactile switches that generally have less than 10 ms of bounce time during contact closures. When choosing the switch, the user should consult the timing specification of the switch to ensure its suitability in an AD5228 application. 1 The terms digital potentiometer and RDAC are used interchangeably. FUNCTIONAL BLOCK DIAGRAM UP/DOWN CONTROL LOGIC DISCRETE STEP/AUTO SCAN DETECT ADAPTIVE DEBOUNCER ZERO- OR MID- SCALE PRESET AD5228 PUSH-UP BUTTON PUSH-DOWN BUTTON R1 R2 D E C O D E A W B VDD PRE GND PU PD Figure 1. The AD5228 can increment or decrement the resistance in discrete steps or in autoscan mode. When the PU or PD button is pressed briefly (no longer than 0.6 s), the resistance of the AD5228 changes by one step. When the PU or PD button is held continuously for more than a second, the device activates the autoscan mode and changes four resistance steps per second. The AD5228 can also be controlled digitally; its up/down features simplify microcontroller usage. The AD5228 is available in a compact thin SOT-23-8 (TSOT-8) package. The part is guaranteed to operate over the automotive temperature range of −40°C to +105°C. The AD5228’s simple interface, small footprint, and very low cost enable it to replace mechanical potentiometers and trimmers with typically 3× improved resolution, solid-state reliability, and faster adjustment, resulting in considerable cost saving in end users’ systems. Users who consider EEMEM potentiometers should refer to the recommendations in the Applications section. Table 1. Truth Table PU PD Operation1 0 0 RWB Decrement 0 1 RWB Increment 1 0 RWB Decrement 1 1 RWB Does Not Change 1RWA increments if RWB decrements and vice versa. |
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