AD5247BKSZ100-2RL7 Datasheet, PDF (1/20 Pages) Analog Devices – 128-Position I2C-Compatible Digital Potentiometer

Data Sheet
FEATURES
128 positions
End-to-end resistance: 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Ultracompact, SC70-6 (2 mm × 2.1 mm) package
I²C-compatible interface
Full read/write of wiper register
Power-on preset to midscale
Single-supply 2.7 V to 5.5 V
Rheostat mode temperature coefficient: 45 ppm/°C
Low power, IDD = 0.9 µA at 3.3 V typical
Wide operating temperature range: −40°C to +125°C
APPLICATIONS
Mechanical potentiometer replacement in new designs
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier-biasing
LCD brightness and contrast adjustment
Automotive electronics adjustment
Gain control and offset adjustment
GENERAL DESCRIPTION
The AD5247 provides a compact, 2 mm × 2.1 mm, packaged
solution for 128-position adjustment applications. This device
performs the same electronic adjustment function as a mechanical
potentiometer or a variable resistor. Available in four different
end-to-end resistance values (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, which can also be used to read back the present
wiper register control word. The 10 kΩ and 100 kΩ options each
128-Position I²C-Compatible
Digital Potentiometer
AD5247
FUNCTIONAL BLOCK DIAGRAM
V_DD
A
SDA
I²C INTERFACE
SCL
W
WIPER
REGISTER
B
GND
Figure 1.
have three hard-coded slave address options available to allow
users access to three of these devices on one I²C bus (see Table 8
for a full list of slave address locations).
The resistance between the wiper and either end point of
the fixed resistor varies linearly with respect to the digital
code transferred into the RDAC latch. Note the terms digital
potentiometer, VR (variable resistor), and RDAC are used
interchangeably in this document.
Operating from a 2.7 V to 5.5 V power supply and consuming
0.9 µA (3.3 V) allows the AD5247 to be used in portable
battery-operated applications.
Rev. F
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