What is the resistance tolerance of the digital potentiometers?
The resistor tolerance error is the difference between the nominal resistor value and the real value measured between teh resistor terminals.
Analog offer a wide range of resistor tolerance, ±1%, ±8%, ±15%, ±20% or ±30%. Please see datasheets for more information
If using the pot in the 3-terminal voltage divider mode (without any series resistor), the tolerance is irrelevant because the resistances RWA and RWB are ratiometric. If using the pot in the 2 terminal rheostat mode, you should account for the worst case variation.
Some NVM digipots store the tolerance error in the EEPROM at factory with an accuracy of 0.1%. Thus users can retrieve the resistance tolerance and calibrate the system accordingly.
Retrieving data ...