AD5280BRUZ200 Datasheet, PDF (1/28 Pages) Analog Devices – Single/Dual, +15 V/±5 V, 256-Position, I2C-Compatible Digital Potentiometer

Single/Dual, +15 V/±5 V, 256-Position,
I²C-Compatible Digital Potentiometer
AD5280/AD5282
FEATURES
AD5280: 1 channel
AD5282: 2 channels
256 positions
+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
Programmable reset
Operating temperature: −40^oC to +85^oC
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 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.
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
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.}
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-mounted
14-lead TSSOP and 16-lead TSSOP. All parts are guaranteed to
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.
FUNCTIONAL BLOCK DIAGRAMS
AWB
O₁
O₂
SHDN
V_DD
V_L
V_SS
RDAC REGISTER
OUTPUT REGISTER
SCL
SDA
GND
ADDRESS
CODE
PWR ON
8 RESET
SERIAL INPUT REGISTER
AD5280
AD0
AD1
Figure 1. AD5280
A₁ W₁ B₁
A₂ W₂ B₂
O₁
SHDN
V_DD
V_L
V_SS
OUTPUT
REGISTER
RDAC1 REGISTER
RDAC2 REGISTER
SCL
SDA
GND
ADDRESS
CODE
PWR ON
8 RESET
SERIAL INPUT REGISTER
AD5282
AD0
AD1
Figure 2. AD5282
Rev. C
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