AD5243 Datasheet, PDF (1/20 Pages) Analog Devices – Dual 256-Position I2C Compatible Digital Potentiometer

Dual 256-Position I²C Compatible
Digital Potentiometer
AD5243/AD5248
FEATURES
2-channel, 256-position
End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ
Compact MSOP-10 (3 mm × 4.9 mm) package
Fast settling time: tS = 5 µs typ on power-up
Full read/write of wiper register
Power-on preset to midscale
Extra package address decode pins AD0 and AD1 (AD5248
only)
Computer software replaces µC in factory programming
applications
Single supply: 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/°C
Low power: IDD = 6 µA max
Wide operating temperature: −40°C to +125°C
Evaluation board available
APPLICATIONS
Systems calibrations
Electronics level settings
Mechanical Trimmers® replacement in new designs
Permanent factory PCB setting
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
GENERAL DESCRIPTION
The AD5243 and AD5248 provide a compact 3 mm × 4.9 mm
packaged solution for dual 256-position adjustment applica-
tions. These devices perform the same electronic adjustment
function as a 3-terminal mechanical potentiometer (AD5243)
or a 2-terminal variable resistor (AD5248). Available in four
different end-to-end resistance values (2.5 kΩ, 10 kΩ, 50 kΩ,
and 100 kΩ), these low temperature coefficient devices are ideal
for high accuracy and stability variable resistance adjustments.
The wiper settings are controllable through the I²C compatible
digital interface. The AD5248 has extra package address decode
pins AD0 and AD1, allowing multiple parts to share the same
I²C 2-wire bus on a PCB. The resistance between the wiper and
either endpoint of the fixed resistor varies linearly with respect
to the digital code transferred into the RDAC latch.¹
FUNCTIONAL BLOCK DIAGRAMS
A1 W1 B1
A2 W2 B2
V_DD
GND
SDA
SCL
WIPER
REGISTER 1
WIPER
REGISTER 2
AD5243
PC INTERFACE
Figure 1. AD5243
W1 B1
W2 B2
V_DD
GND
AD0
AD1
SDA
SCL
RDAC
REGISTER 1
RDAC
REGISTER 2
ADDRESS
/ ^DECODE
8
AD5248
SERIAL INPUT
REGISTER
Figure 2. AD5248
Operating from a 2.7 V to 5.5 V power supply and consuming
less than 6 µA allows for usage in portable battery-operated
applications.
For applications that program the AD5243/AD5258 at the
factory, Analog Devices offers device programming software
running on Windows® NT/2000/XP operating systems. This
software effectively replaces any external I²C controllers, which
in turn enhances users’ systems time-to-market. An AD5243/
AD5248 evaluation kit and software are available. The kit
includes a cable and instruction manual.
1_{The terms digital potentiometer, VR, and RDAC are used interchangeably.}
Rev. 0
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