AD5121

Single Channel, 128-/256-Position, I2C/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 LFCSP package 4 kV ESD protection VLOGIC AD5121/AD5141 FUNCTIONAL BLOCK DIAGRAM VDD INDEP POWER-ON RESET AD5121/ AD5141 RESET DIS SCLK/SCL SDI/SDA SYNC/ADDR0 SDO/ADDR1 SERIAL INTERFACE 7/8 RDAC INPUT REGISTER A W B EEPROM MEMORY APPLICATIONS Portable electronics level adjustment LCD panel brightness and contrast controls Programmable filters, delays, and time constants Programmable power supplies GND VSS WP Figure 1. GENERAL DESCRIPTION The AD5121/AD5141 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 A, B, and W 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 string resistors, allowing very accurate resistor matching. The high bandwidth and low total ha...