AD5122A Datasheet, PDF (1/32 Pages) Analog Devices – The AD5122A/AD5142A are available in a compact, 16-lead, 3 mm × 3 mm LFCSP and a 16-lead TSSOP.

Data Sheet
Dual Channel, 128-/256-Position, I²C,
Nonvolatile Digital Potentiometer
AD5122A/AD5142A
FEATURES
10 kΩ and 100 kΩ resistance options
Resistor tolerance: 8% maximum
Wiper current: ±6 mA
Low temperature coefficient: 35 ppm/°C
Wide bandwidth: 3 MHz
Fast start-up time < 75 μs
Linear gain setting mode
Single- and dual-supply operation
Independent logic supply: 1.8 V to 5.5 V
Wide operating temperature: −40°C to +125°C
3 mm × 3 mm package option
4 kV ESD protection
APPLICATIONS
Portable electronics level adjustment
LCD panel brightness and contrast controls
Programmable filters, delays, and time constants
Programmable power supplies
FUNCTIONAL BLOCK DIAGRAM
V_LOGIC
V_DD
INDEP
POWER-ON
RESET
AD5122A/
AD5142A
RDAC1
A1
RESET
INPUT
REGISTER 1
W1
SCL
B1
SERIAL
RDAC2
SDA
INTERFACE _7/8
A2
INPUT
REGISTER 2
W2
ADDR1
B2
ADDR0
EEPROM
MEMORY
GND V_SS
Figure 1.
GENERAL DESCRIPTION
The AD5122A/AD5142A potentiometers provide a nonvolatile
solution for 128-/256-position adjustment applications, offering
guaranteed low resistor tolerance errors of ±8% and up to ±6 mA
current density in the Ax, Bx, and Wx pins.
The low resistor tolerance and low nominal temperature coefficient
simplify open-loop applications as well as applications requiring
tolerance matching.
The linear gain setting mode allows independent programming
of the resistance between the digital potentiometer terminals,
through RAW and RWB the string resistors, allowing very accurate
resistor matching.
The high bandwidth and low total harmonic distortion (THD)
ensure optimal performance for ac signals, making it suitable
for filter design.
The low wiper resistance of only 40 Ω at the ends of the resistor
array allows for pin-to-pin connection.
The wiper values can be set through an I²C-compatible digital
interface that is also used to read back the wiper register and
EEPROM contents.
The AD5122A/AD5142A are available in a compact, 16-lead,
3 mm × 3 mm LFCSP and a 16-lead TSSOP. The parts are
guaranteed to operate over the extended industrial temperature
range of −40°C to +125°C.
Rev. A
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Table 1. Family Models
Model Channel Position
AD5123¹ Quad
128
AD5124 Quad
128
AD5124 Quad
128
AD5143¹ Quad
256
AD5144 Quad
256
AD5144 Quad
256
AD5144A Quad
256
AD5122 Dual
128
AD5122A Dual
128
AD5142 Dual
256
AD5142A Dual
256
AD5121 Single 128
AD5141 Single 256
Interface
I²C
SPI/I²C
SPI
I²C
SPI/I²C
SPI
I²C
SPI
I²C
SPI
I²C
SPI/I²C
SPI/I²C
Package
LFCSP
LFCSP
TSSOP
LFCSP
LFCSP
TSSOP
TSSOP
LFCSP/TSSOP
LFCSP/TSSOP
LFCSP/TSSOP
LFCSP/TSSOP
LFCSP
LFCSP
1 _{Two potentiometers and two rheostats.}
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