AD5241BR10 Datasheet, PDF (1/16 Pages) Analog Devices – I2C Compatible 256-Position Digital Potentiometers

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I²C^® Compatible
256-Position Digital Potentiometers
AD5241/AD5242
FEATURES
256 Positions
10 k⍀, 100 k⍀, 1 M⍀
Low Tempco 30 ppm/؇C
Internal Power ON Midscale Preset
Single-Supply 2.7 V to 5.5 V or
Dual-Supply ؎2.7 V for AC or Bipolar Operation
I²C Compatible Interface with Readback Capability
Extra Programmable Logic Outputs
Self-Contained Shutdown Feature
Extended Temperature Range –40؇C to +105؇C
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 I²C 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.
FUNCTIONAL BLOCK DIAGRAM
A₁ W₁ B₁
O₁ O₂
SHDN
AD5241
V_DD
V_SS
RDAC
REGISTER 1
REGISTER 2
ADDR
DECODE
8
SDA
SCL
GND
SERIAL INPUT REGISTER
AD0 AD1
PWR-ON
RESET
SHDN
A W₁ B₁
1
A₂ W₂ B₂
O₁ O₂
REGISTER
V_DD
V_SS
RDAC
REGISTER 1
RDAC
REGISTER 2
SDA
SCL
GND
ADDR
DECODE
AD5242 ₈
1
SERIAL INPUT REGISTER
AD0 AD1
PWR-ON
RESET
*Nonvolatile digital potentiometer
I²C is a registered trademark of Philips Corporation.
REV. B
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© Analog Devices, Inc., 2002