MAX5130 Maxim Integrated Products, MAX5130 Datasheet - Page 14

• Manufacturer Part Number: MAX5130
• Description: (MAX5130 / MAX5131) Voltage-output DACs
• Manufacturer: Maxim Integrated Products

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Integral nonlinearity (Figure 8a) is the deviation of the
values on an actual transfer function from a straight
line. This straight line can be either a best-straight-line
fit (closest approximation to the actual transfer curve)
or a line drawn between the endpoints of the transfer
function, once offset and gain errors have been nulli-
fied. For a DAC, the deviations are measured at every
single step.
Differential nonlinearity (Figure 8b) is the difference
between an actual step height and the ideal value of
+3V/+5V, 13-Bit, Serial Voltage-Output DACs
with Internal Reference
Figure 8a. Integral Nonlinearity
Figure 8c. Offset Error
14
__________Applications Information
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3
2
1
0
000
7
6
5
4
3
2
1
0
000
ACTUAL
OFFSET
POINT
IDEAL OFFSET
POINT
DIAGRAM
001
ACTUAL
001
DIGITAL INPUT CODE
010
DIGITAL INPUT CODE
AT STEP
001 (1/4 LSB )
Differential Nonlinearity (DNL)
011
OFFSET ERROR
(+1 1/4 LSB)
010
Integral Nonlinearity (INL)
100
AT STEP
011 (1/2 LSB )
IDEAL DIAGRAM
101
011
110
Definitions
111
1LSB. If the magnitude of the DNL is less than 1LSB, the
DAC guarantees no missing codes and is monotonic.
The offset error (Figure 8c) is the difference between
the ideal and the actual offset point. For a DAC, the off-
set point is the step value when the digital input is zero.
This error affects all codes by the same amount and
can usually be compensated for by trimming.
Gain error (Figure 8d) is the difference between the
ideal and the actual full-scale output voltage on the
transfer curve, after nullifying the offset error. This error
alters the slope of the transfer function and corre-
sponds to the same percentage error in each step.
Figure 8b. Differential Nonlinearity
Figure 8d. Gain Error
6
5
4
3
2
1
0
7
6
5
4
0
000
000
IDEAL DIAGRAM
100
001
GAIN ERROR
(-1 1/4 LSB)
DIGITAL INPUT CODE
IDEAL FULL-SCALE OUTPUT
010
DIGITAL INPUT CODE
101
1 LSB
011
DIFFERENTIAL
LINEARITY ERROR (+1/4 LSB)
DIFFERENTIAL LINEARITY
ERROR (-1/4 LSB)
100
110
FULL-SCALE
101
OUTPUT
ACTUAL
1 LSB
111
Offset Error
Gain Error