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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
AD5241/AD5242
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 © Analog Devices, Inc., 2002
FUNCTIONAL BLOCK DIAGRAM
RDAC
REGISTER 1
ADDR
DECODE
8
PWR-ON
RESET
SERIAL INPUT REGISTER
AD5241SHDN
V
DD
V
SS
SDA
SCL
GND
A
1
W
1
B
1
O
1
O
2
REGISTER 2
AD0 AD1
RDAC
REGISTER 1
ADDR
DECODE
8
PWR-ON
RESET
SERIAL INPUT REGISTER
AD5242
SHDN
V
DD
V
SS
SDA
SCL
GND
A
1
W
1
B
1
A
2
W
2
B
2
RDAC
REGISTER 2
O
2
O
1
REGISTER
1
AD0 AD1
FEATURES
256 Positions
10 kH9024, 100 kH9024, 1 MH9024
Low Tempco 30 ppm/H11543C
Internal Power ON Midscale Preset
Single-Supply 2.7 V to 5.5 V or
Dual-Supply H115502.7 V for AC or Bipolar Operation
I
2
C Compatible Interface with Readback Capability
Extra Programmable Logic Outputs
Self-Contained Shutdown Feature
Extended Temperature Range –40H11543C to +105H11543C
APPLICATIONS
Multimedia, Video, and Audio
Communications
Mechanical Potentiometer Replacement
Instrumentation: Gain, Offset Adjustment
Programmable Voltage-to-Current Conversion
Line Impedance Matching
GENERAL DESCRIPTION
The AD5241/AD5242 provide a single-/dual-channel, 256-
position, digitally controlled variable resistor (VR) device. These
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.
For AD5242, the fixed A-to-B terminal resistance of 10 kΩ,
100 kΩ, or 1 MΩ has a 1% channel-to-channel matching
tolerance. The nominal temperature coefficient of both parts is
30 ppm/°C.
Wiper position programming defaults to midscale at system
power ON. Once powered, the VR wiper position is programmed
by an I
2
C compatible 2-wire serial data interface. Both parts
have available two extra programmable logic outputs that
enable users to drive digital loads, logic gates, LED drivers, and
analog switches in their system.
The AD5241/AD5242 are available in surface-mount (SOIC-14/-
16) packages and, for ultracompact solutions, TSSOP-14/-16
packages. All parts are guaranteed to operate over the
extended temperature range of –40°C to +105°C. For 3-wire,
SPI compatible interface applications, please refer to AD5200,
AD5201, AD5203, AD5204, AD5206, AD5231*, AD5232*,
AD5235*, AD7376, AD8400, AD8402, and AD8403 products.
I
2
C
®
Compatible
256-Position Digital Potentiometers
*Nonvolatile digital potentiometer
I
2
C is a registered trademark of Philips Corporation.