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AD5227BUJZ10-RL72 Folha de dados(PDF) 1 Page - Analog Devices

Nome de Peças AD5227BUJZ10-RL72
Descrição Electrónicos  64-Position Up/DownControl Digital Potentiometer
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Página de início  http://www.analog.com
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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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