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AD5242BRU100-REEL7 Datasheet(Hoja de datos) 1 Page - Analog Devices

No. de Pieza. AD5242BRU100-REEL7
Descripción  I2C-Compatible, 256-Position Digital Potentiometers
Descarga  20 Pages
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Fabricante  AD [Analog Devices]
Página de inicio  http://www.analog.com
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I2C-Compatible,
256-Position Digital Potentiometers
AD5241/AD5242
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2001–2009 Analog Devices, Inc. All rights reserved.
FEATURES
256 positions
10 kΩ, 100 kΩ, 1 MΩ
Low temperature coefficient: 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
FUNCTIONAL BLOCK DIAGRAM
RDAC
REGISTER 1
ADDR
DECODE
8
PWR-ON
RESET
SERIAL INPUT REGISTER
AD5241
SHDN
VDD
VSS
SDA
SCL
GND
A1 W1 B1
O1 O2
REGISTER 2
AD0
AD1
Figure 1. AD5241 Functional Block Diagram
A1 W1 B1
A2 W2 B2
O1 O2
RDAC
REGISTER 1
ADDR
DECODE
8
PWR-ON
RESET
SERIAL INPUT REGISTER
AD5242
VDD
VSS
SDA
SCL
GND
RDAC
REGISTER 2
REGISTER
1
AD0
AD1
SHDN
Figure 2. AD5242 Functional Block Diagram
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 the
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. When powered, the VR wiper position is programmed
by an I2C®-compatible, 2-wire serial data interface. Both parts
have two extra programmable logic outputs available 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, 14-lead
SOIC and 16-lead SOIC packages and, for ultracompact solutions,
14-lead TSSOP and 16-lead TSSOP packages. All parts are
guaranteed to operate over the extended temperature range of
−40°C to +105°C.




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