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DS1867

Dual Digital Potentiometer with EEPROM

Dallas Semiconductor -> Maxim Integrated 

FIXED GAIN ATTENUATOR Figure 8

DS1867

ABSOLUTE AND RELATIVE LINEARITY

Absolute linearity is defined as the difference between the actual measured output voltage and the

expected output voltage. Figure 9 presents the test circuit used to measure absolute linearity. Absolute

linearity is given in terms of a minimum increment or expected output when the wiper position is moved

one position. In the case of the test circuit, a minimum increment (MI) would equal 10/512volts. The

equation for absolute linearity is given in equation (1).

Eq: (1) Absolute Linearity

AL = {Vo(actual)- Vo(expected)}/MI

Relative linearity is a measure of error between two adjacent wiper position points and is given in terms

of MI by equation (2).

Eq: (2) Relative Linearity

RL = {Vo(n+1) - Vo(n)}/MI

Figure 10 is a plot of absolute linearity and relative linearity versus wiper position for the DS1867 at

25°C. The specification for absolute linearity of the DS1867 is ±0.75 MI typical. The specification for

relative linearity of the DS1867 is ±0.30 MI typical.

LINEARITY MEASUREMENT CONFIGURATION Figure 9

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