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AD5165 Datasheet

  • AD5165

  • 256-Position, Ultralow Power 1.8 V Logic-Level Digital Poten...

  • 16頁

  • AD

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256-Position, Ultralow Power
1.8 V Logic-Level Digital Potentiometer
AD5165
FEATURES
Ultralow standby power I
DD
= 50 nA typical
256-position
End-to-end resistance 100 k鈩?/div>
Logic high voltage 1.8 V
Power supply 2.7 V to 5.5 V
Low temperature coefficient 35 ppm/擄C
Compact thin 8-lead TSOT-8 (2.9 mm 脳 2.8 mm) package
Simple 3-wire digital interface
Wide operating temperature 鈭?0擄C to +125擄C
Pin-to-pin compatible to AD5160 with CS inverted
FUNCTIONAL BLOCK DIAGRAM
V
DD
A
CS
SDI
CLK
3-WIRE
INTERFACE
W
WIPER
REGISTER
B
04749-0-001
GND
APPLICATIONS
Battery-operated electronics adjustment
Remote utilities meter adjustment
Mechanical potentiometer replacement
Transducer circuit adjustment
Automotive electronics adjustment
Gain control and offset adjustment
System calibration
VCXO adjustment
Figure 1.
PIN CONFIGURATION
W
1
8
A
04749-0-002
AD5165
7
B
V
DD 2
TOP VIEW
GND
3
(Not to Scale)
6
CS
5
SDI
CLK
4
Figure 2.
GENERAL OVERVIEW
The AD5165 provides a compact 2.9 mm 脳 2.8 mm packaged
solution for 256-position adjustment applications. These devices
perform the same electronic adjustment function as mechanical
potentiometers or variable resistors, with enhanced resolution,
solid-state reliability, and superior low temperature coefficient
performance. The AD5165鈥檚 supply voltage requirement is 2.7 V
to 5.5 V, but its logic voltage requirement is 1.8 V to V
DD
. The
AD5165 consumes very low quiescent power during standby
mode and is ideal for battery-operated applications.
Wiper settings are controlled through a simple 3-wire interface.
The interface is similar to the SPI廬 digital interface except for the
inverted chip-select function that minimizes logic power con-
sumption in the idling state. The resistance between the wiper
and either endpoint of the fixed resistor varies linearly with
respect to the digital code transferred into the wiper register.
Operating from a 2.7 V to 5.5 V power supply and consuming
less than 50 nA typical standby power allows use in battery-
operated portable or remote utility device applications.
TYPICAL APPLICATION
5V
V
OH
= 1.8V MIN
V
DD
3.3V
AD5165
CS
CLK
SDI
GND
V
A
V
W
WIDE TERMINAL
VOLTAGE RANGE:
0V < V
A
,V
B
,V
W
< 5V
04749-0-003
DIGITAL
CONTROL
LOGIC OR
MICRO
V
B
Figure 3.
Note:
The terms
digital potentiometer, RDAC,
and
VR
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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