Single/Dual, +15 V/ 5 V, ꢀ5ꢁ6-PoiꢂiPn,
IꢀC6CPmpaꢂible Digiꢂal -PꢂenꢂiPmeꢂer
AD5ꢀ80/AD5ꢀ8ꢀ
logic outputs that enable users to drive digital loads, logic gates,
LED drivers, and analog switches in their system.
FEATURES
AD5280: 1 channel
AD5282: 2 channels
256 positions
The AD5280/AD5282 are available in thin, surface-mounted
14-lead TSSOP and 16-lead TSSOP. All parts are guaranteed to
+10 V to +15 V single supply; 5.5 V dual-supply operation
Fixed terminal resistance: 20 kΩ, 50 kΩ, 200 kΩ
Low temperature coefficient: 30 ppm/°C
Power-on midscale preset1
operate over the extended industrial temperature range of
−40°C to +85°C. For 3-wire SPI-compatible interface applica-
tions, see the AD5260/AD5262 product information on
www.analog.com.
Programmable reset
Operating temperature: −40oC to +85oC
I2C-compatible interface
FUNCTIONAL BLOCK DIAGRAMS
A
W
B
O
O
2
1
APPLICATIONS
SHDN
Multimedia, video, and audio
Communications
V
DD
V
L
RDAC REGISTER
OUTPUT REGISTER
PWR ON
V
SS
Mechanical potentiometer replacement
Instrumentation: gain, offset adjustment
Programmable voltage source
Programmable current source
Line impedance matching
ADDRESS
CODE
RESET
8
SCL
SDA
GND
SERIAL INPUT REGISTER
GENERAL DESCRIPTION
AD5280
The AD5280/AD5282 are single-channel and dual-channel,
256-position, digitally controlled variable resistors (VRs)2.
The devices perform the same electronic adjustment function
as a potentiometer, trimmer, or variable resistor. Each VR offers
a completely programmable value of resistance between the
A terminal and the wiper or the B terminal and the wiper. The
fixed A-to-B terminal resistance of 20 kΩ, 50 kΩ, or 200 kΩ has
a 1% channel-to-channel matching tolerance. The nominal
temperature coefficient of both parts is 30 parts per million/
degrees centigrade (ppm/°C). Another key feature is that the
parts can operate up to +15 V or 5 V.
AD0
AD1
Figure 1. AD5280
A
W
B
A
W
B
O
1
1
1
1
2
2
2
OUTPUT
REGISTER
SHDN
V
DD
V
L
RDAC1 REGISTER
RDAC2 REGISTER
PWR ON
V
SS
ADDRESS
CODE
RESET
8
Wiper position programming defaults to midscale at system
power-on. When powered, the VR wiper position is programmed
by an I2C-compatible, 2-wire serial data interface. The AD5280/
AD5282 feature sleep mode programmability. This allows any
level of preset in power-up and is an alternative to a costly
EEPROM solution. Both parts have additional programmable
SCL
SDA
GND
SERIAL INPUT REGISTER
AD5282
AD0
AD1
Figure 2. AD5282
1 Assert shutdown and program the device during power-up, then deassert
the shutdown to achieve the desired preset level.
2 The terms digital potentiometer, VR, and RDAC are used interchangeably.
Rev. C
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 registeredtrademarks arethe 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: 781.461.3113 ©2002–2009 Analog Devices, Inc. All rights reserved.
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