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AD5227 Datasheet

  • AD5227

  • 64-Position Up/Down Control Digital Potentiometer

  • 16頁(yè)

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64-Position Up/Down
Control Digital Potentiometer
AD5227
FEATURES
64-position digital potentiometer
10 k鈩? 50 k鈩? 100 k鈩?end-to-end terminal resistance
Simple up/down digital or manual configurable control
Midscale preset
Low potentiometer mode tempco = 10 ppm/擄C
Low rheostat mode tempco = 35 ppm/擄C
Ultralow power, I
DD
= 0.4 碌A(chǔ) typ and 3 碌A(chǔ) max
Fast adjustment time, ts = 1 碌s
Chip select enable multiple device operation
Low operating voltage, 2.7 V to 5.5 V
Automotive temperature range, 鈭?0擄C to +105擄C
Compact thin SOT-23-8 (2.9 mm 脳 3 mm) Pb-free package
FUNCTIONAL BLOCK DIAGRAM
V
DD
AD5227
CS
U/D
CLK
A
6-BIT UP/DOWN
CONTROL
LOGIC
W
B
GND
04419-0-001
POR
MIDSCALE
WIPER
REGISTER
Figure 1.
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鈥?latest 64-step up/down control
digital potentiometer
1
. 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 Table 1). The interface is simple to activate by
any host controller, discrete logic, or manually with a rotary
encoder or pushbuttons. The AD5227鈥檚 64-step resolution, small
footprint, and simple interface enable it to replace mechanical
potentiometers and trimmers with typically 6脳 improved
resolution, solid-state reliability, and design layout flexibility,
resulting in a considerable cost savings in end users鈥?systems.
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 鈭?0擄C to +105擄C.
Users who consider EEMEM potentiometers should refer to
some recommendations in the Applications section.
Table 1. Truth Table
CS
0
0
1
CLK
鈫?/div>
鈫?/div>
X
U/D
0
1
X
Operation
1
R
WB
Decrement
R
WB
Increment
No Operation
1
R
WA
increments if R
WB
decrements and vice versa.
1
The terms
digital potentiometer
and
RDAC
are used interchangeably.
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
漏 2004 Analog Devices, Inc. All rights reserved.

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