AD5280BRU200 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
AD5280BRU200 Datasheet PDF : 20 Pages
| |||
a
15 V, I2C Compatible
256-Position Digital Potentiometers
AD5280/AD5282*
FEATURES
256 Position
AD5280: 1-Channel
AD5282: 2-Channel (Independently Programmable)
Potentiometer Replacement
20 k⍀, 50 k⍀, 200 k⍀
Low Temperature Coefficient 30 ppm/°C
Internal Power-On Midscale Preset
5 V to 15 V Single-Supply; ؎5.5 V Dual-Supply Operation
I2C Compatible Interface
APPLICATIONS
Multimedia, Video, and Audio
Communications
Mechanical Potentiometer Replacement
Instrumentation: Gain, Offset Adjustment
Programmable Voltage Source
Programmable Current Source
Line Impedance Matching
GENERAL DESCRIPTION
The AD5280/AD5282 provides a single-/dual-channel, 256-position
digitally controlled variable resistor (VR) device.1 These devices
perform the same electronic adjustment function as a potenti-
ometer, 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% chan-
nel-to-channel matching tolerance. Nominal temperature
coefficient of both parts is 30 ppm/°C. Another key feature of
these parts is that they can operate up to +15 V or ±5 V.
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 additional programmable logic outputs that enable users to
drive digital loads, logic gates, LED drivers, and analog switches
in their system.
The AD5280/AD5282 are available in thin surface-mount
14-lead and 16-lead TSSOP packages. All parts are guaranteed
to operate over the extended industrial temperature range
of –40°C to +85°C. For 3-wire SPI compatible interface appli-
cations, see AD5260/AD5262 products.
FUNCTIONAL BLOCK DIAGRAMS
A
W
B
O1
O2
SHDN
VDD
VSS
VL
SCL
SDA
GND
RDAC REGISTER
OUTPUT REGISTER
ADDRESS
DECODE
PWR ON
8 RESET
SERIAL INPUT REGISTER
AD5280
AD0 AD1
A1 W1 B1
A2 W2 B2
O1
SHDN
OUTPUT
REGISTER
VDD
VSS
VL
SCL
SDA
GND
RDAC1 REGISTER
RDAC2 REGISTER
ADDRESS
DECODE
PWR ON
8
RESET
SERIAL INPUT REGISTER
AD5282
AD0 AD1
*Patent Pending.
NOTE
1The terms digital potentiometer, VR, and RDAC 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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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
Share Link: 