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DS1867-050 Datasheet(PDF) 8 Page - Dallas Semiconductor |
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DS1867-050 Datasheet(HTML) 8 Page - Dallas Semiconductor |
8 / 14 page DS1867 8 of 14 102199 FIXED GAIN ATTENUATOR Figure 8 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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