AD5122

Dual Channel, 128-/256-Position, SPI, Nonvolatile Digital Potentiometer 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 3 mm × 3 mm package option 4 kV ESD protection VLOGIC VDD AD5122/AD5142 FUNCTIONAL BLOCK DIAGRAM INDEP POWER-ON RESET AD5122/ AD5142 RDAC1 A1 W1 B1 RESET SCLK SDI SYNC SDO SERIAL INTERFACE INPUT REGISTER 1 RDAC2 7/8 INPUT REGISTER 2 EEPROM MEMORY A2 W2 B2 APPLICATIONS Portable electronics level adjustment LCD panel brightness and contrast controls Programmable filters, delays, and time constants Programmable power supplies GND VSS Figure 1. GENERAL DESCRIPTION The AD5122/AD5142 potentiometers provides 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 ...