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Data Sheet
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 4 mm × 4 mm package option
APPLICATIONS
Portable electronics level adjustment LCD panel brightness and contrast controls Programmable filters, delays, and time constants Programmable power supplies
Quad Channel, 128-/256-Position, I2C/SPI, Nonvolatile Digital Potentiometer
AD5124/AD5144/AD5144A
FUNCTIONAL BLOCK DIAGRAM
VLOGIC
VDD
LRDAC
POWER-ON RESET
RESET DIS
SCLK/SCL SDI/SDA
SYNC/ADDR0 SDO/ADDR1
SERIAL INTERFACE 7/8
AD5124/AD5144
RDAC1
A1
INPUT REGISTER 1
W1
B1
RDAC2
A2
INPUT REGISTER 2
W2
B2
RDAC3 A3
INPUT REGISTER 3
W3
B3
RDAC4
A4
INPUT
REGISTER 4
W4
B4 EEPROM MEMORY
10877-001
GND VSS
WP
Figure 1. AD5124/AD5144 24-Lead LFCSP
GENERAL DESCRIPTION
The AD5124/AD5144/AD5144A 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 the RAW and RWB string resistors, allowing very accurate resistor matching.
The high bandwidth and low total harmonic distortion (THD) ensure optimal performance for ac signals, making these devices suitable for filter design.
The low wiper resistance of only 40 Ω at the ends of the resistor array allow for pin-to-pin connection.
The wiper values can be set through an SPI-/I2C-compatible digital interface that is also used to read back the wiper register and EEPROM contents.
The AD5124/AD5144/AD5144A are available in a compact, 24-lead, 4 mm × 4 mm LFCSP and a 20-lead TSSOP. The parts are guaranteed to operate over the extended industrial temperature range of −40°C to +125°C.
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.
Rev. C
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