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The NL
or NL
200
calculated as follows:
1.
The least-squares method is used to find a line of the best fit that represents the
relationship between the input voltage differential (V
differential (V
2. The deviations of the output voltage differential (V
fit are calculated.
3. The sum of the absolute values of the maximum and minimum deviations
(|dev_max|+|dev_min|) is calculated.
4. The ratio of this sum to the full-scale differential output voltage (V
Figure 2.5 shows the relationship between the input voltage and the output voltage
deviation from the line of the best fit.
V
OH
V
OL
Figure 2.5 Input voltage vs. output voltage deviation from the line of best fit
NL
is calculated as follows:
200
From Figure 2.5, dev_max = 1.3 mV, dev_min = -1 mV, and V
© 2018
Toshiba Electronic Devices & Storage Corporation
parameter represents the linearity of an isolation amplifier. NL
100
-V
).
OUT+
OUT-
Approximate line
y=ax+b
Line of the best fit
& measured
|
%
0.0013
IN+
OUT+
The deviation of the
measured data from the
line of best fit is plotted.
|
|
_
_
0.001
2
100
2.5
7 / 19
RD014-RGUIDE-01
-V
) and the output voltage
IN-
-V
) from the line of the best
OUT-
-V
) is calculated.
OH
OL
|
-V
= 2.5 V, then:
OH
OL
0.046%
is
200
Equivalent to
NL
=0.13%
200
(maximum rated
value)
2018-03-15
Rev. 1
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