Single-Channel, 128-/64-/32-Position, I
2
C,
±
8%
Resistor Tolerance, Nonvolatile Digital Potentiometer
Data Sheet
FEATURES
Single-channel, 128-/64-/32-position resolution
5 kΩ, 10 kΩ, 80 kΩ nominal resistance
Maximum ±8% nominal resistor tolerance error
Low wiper resistance
±6 mA maximum wiper current density
Resistor tolerance stored in EEPROM (0.1% accuracy)
Rheostat mode temperature coefficient: 35 ppm/°C
Potentiometer mode temperature coefficient: 5 ppm/°C
2.3 V to 5.5 V single-supply operation
1.8 V to 5.5 V logic supply operation
Power-on EEPROM refresh time < 50 μs
I
2
C-compatible interface
Wiper setting and EEPROM readback
50-year typical data retention at 125°C
1 million write cycles
Wide operating temperature: −40°C to +125°C
Thin, 2 mm × 2 mm × 0.55 mm 8-lead LFCSP package
FUNCTIONAL BLOCK DIAGRAM
V
LOGIC
V
DD
AD5110/AD5112/AD5114
POWER-ON
RESET
A
W
DATA
SDA
SCL
EEPROM
I
2
C
SERIAL
INTERFACE
B
DATA
RDAC
REGISTER
09582-001
GND
Figure 1.
APPLICATIONS
Mechanical potentiometer replacement
Portable electronics level adjustment
Audio volume control
Low resolution DAC
LCD panel brightness and contrast control
Programmable voltage to current conversion
Programmable filters, delays, time constants
Feedback resistor programmable power supply
Sensor calibration
GENERAL DESCRIPTION
The
provide a nonvolatile solution
for 128-/64-/32-position adjustment applications, offering
guaranteed low resistor tolerance errors of ±8% and up to
±6 mA current density in the A, B, and W pins. The low resistor
tolerance, low nominal temperature coefficient and high
bandwidth simplify open-loop applications, as well as tolerance
matching applications.
The new low wiper resistance feature minimizes the wiper
resistance in the extremes of the resistor array to only 45 Ω,
typical.
The wiper settings are controllable through an I
2
C-compatible
digital interface that is also used to readback the wiper register
and EEPROM content. Resistor tolerance is stored within
EEPROM, providing an end-to-end tolerance accuracy of 0.1%.
The
are available in a 2 mm × 2 mm
LFCSP package. The parts are guaranteed to operate over the
extended industrial temperature range of −40°C to +125°C.
Table 1. ±8% Resistance Tolerance Family
Model
Resistance (kΩ)
10, 80
10, 80
5, 10, 80
5, 10, 80
5, 10, 80
10, 80
10, 80
Position
128
128
64
64
64
32
32
Interface
I
2
C
Up/down
I
2
C
Up/down
Push-button
I
2
C
Up/down
Rev. 0
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