Datasheet AD5227 (Analog Devices)

HerstellerAnalog Devices
Beschreibung64-Position Up/Down Control Digital Potentiometer
Seiten / Seite16 / 1 — 64-Position Up/Down. Control Digital Potentiometer. AD5227. FEATURES. …
RevisionB
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DokumentenspracheEnglisch

64-Position Up/Down. Control Digital Potentiometer. AD5227. FEATURES. FUNCTIONAL BLOCK DIAGRAM. 64-position digital potentiometer

Datasheet AD5227 Analog Devices, Revision: B

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64-Position Up/Down Control Digital Potentiometer AD5227 FEATURES FUNCTIONAL BLOCK DIAGRAM 64-position digital potentiometer VDD 10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance AD5227 Simple up/down digital or manual configurable control Midscale preset CS A 6-BIT UP/DOWN Low potentiometer mode tempco = 10 ppm/°C U/D CONTROL W LOGIC Low rheostat mode tempco = 35 ppm/°C CLK B Ultralow power, IDD = 0.4 μA typ and 3 μA max Fast adjustment time, ts = 1 μs GND Chip select enable multiple device operation POR WIPER MIDSCALE REGISTER Low operating voltage, 2.7 V to 5.5 V
04419-0-001
Automotive temperature range, −40°C to +105°C
Figure 1.
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 GENERAL DESCRIPTION
The AD5227 is Analog Devices’ latest 64-step up/down control The AD5227 is available in a compact thin SOT-23-8 (TSOT-8) digital potentiometer1. This device performs the same electronic Pb-free package. The part is guaranteed to operate over the adjustment function as a 5 V potentiometer or variable resistor. automotive temperature range of −40°C to +105°C. Its simple 3-wire up/down interface allows manual switching or high speed digital control. The AD5227 presets to midscale at Users who consider EEMEM potentiometers should refer to power-up. When CS is enabled, the devices changes step at some recommendations in the Applications section. every clock pulse. The direction is determined by the state of
Table 1. Truth Table
the U/D pin (see Table 1). The interface is simple to activate by
CS Operation1 CLK U/D
any host controller, discrete logic, or manually with a rotary 0 ↓ 0 RWB Decrement encoder or pushbuttons. The AD5227’s 64-step resolution, small 0 ↓ 1 RWB Increment footprint, and simple interface enable it to replace mechanical 1 X X No Operation potentiometers and trimmers with typically 6× improved resolution, solid-state reliability, and design layout flexibility, 1 RWA increments if RWB decrements and vice versa. resulting in a considerable cost savings in end users’ systems. 1 The terms digital potentiometer and RDAC are used interchangeably.
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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. or otherwise under any patent or patent rights of Analog Devices. Trademarks and Tel: 781.329.4700 www.analog.com registered trademarks are the property of their respective owners. Fax: 781.326.8703© 2004–2009 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY ELECTRICAL CHARACTERISTICS INTERFACE TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION PROGRAMMING THE DIGITAL POTENTIOMETERS Rheostat Operation Potentiometer Mode Operation DIGITAL INTERFACE TERMINAL VOLTAGE OPERATION RANGE POWER-UP AND POWER-DOWN SEQUENCES LAYOUT AND POWER SUPPLY BIASING APPLICATIONS MANUAL CONTROL WITH TOGGLE AND PUSHBUTTON SWITCHES MANUAL CONTROL WITH ROTARY ENCODER ADJUSTABLE LED DRIVER ADJUSTABLE CURRENT SOURCE FOR LED DRIVER ADJUSTABLE HIGH POWER LED DRIVER AUTOMATIC LCD PANEL BACKLIGHT CONTROL 6-BIT CONTROLLER CONSTANT BIAS WITH SUPPLY TO RETAIN RESISTANCE SETTING OUTLINE DIMENSIONS ORDERING GUIDE