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MC1408-8DR2G Datasheet(PDF) 6 Page - ON Semiconductor

No. de pieza MC1408-8DR2G
Descripción Electrónicos  8?뭕it Multiplying D/A Converter
Download  9 Pages
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC1408-8DR2G Datasheet(HTML) 6 Page - ON Semiconductor

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MC1408−8
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6
Output Voltage Range
The voltage at Pin 4 must always be at least 4.5 V more
positive than the voltage of the negative supply (Pin 3) when
the reference current is 2.0 mA or less, and at least 8 V more
positive than the negative supply when the reference current
is between 2.0 mA and 4.0 mA. This is necessary to avoid
saturation of the output transistors, which would cause
serious degradation of accuracy.
ON Semiconductor’s MC1408−8 does not need a range
control because the design extends the compliance range
down to 4.5 V (or 8.0 V−see above) above the negative
supply voltage without significant degradation of accuracy.
ON Semiconductor’s MC1408−8 can be used in sockets
designed for other manufacturers’ MC1408 without circuit
modification.
Output Current Range
Any time the full−scale current exceeds 2.0 mA, the
negative supply must be at least 8.0 V more negative than
the output voltage. This is due to the increased internal
voltage drops between the negative supply and the outputs
with higher reference currents.
Accuracy
Absolute accuracy is the measure of each output current
level with respect to its intended value, and is dependent
upon relative accuracy, full−scale accuracy and full−scale
current drift. Relative accuracy is the measure of each output
current level as a fraction of the full−scale current after
zero−scale current has been nulled out. The relative
accuracy of the MC1408−8 is essentially constant over the
operating temperature range because of the excellent
temperature tracking of the monolithic resistor ladder. The
reference current may drift with temperature, causing a
change in the absolute accuracy of output current; however,
the MC1408−8 has a very low full−scale current drift over
the operating temperature range.
The MC1408−8 series is guaranteed accurate to within
±1/2 LSB at +25 °C at a full−scale output current of
1.99 mA. The relative accuracy test circuit is shown in
Figure 5. The 12−bit converter is calibrated to a full−scale
output current of 1.99219 mA; then the MC1408−8’s
full−scale current is trimmed to the same value with R14 so
that a zero value appears at the error amplifier output. The
counter is activated and the error band may be displayed on
the oscilloscope, detected by comparators, or stored in a
peak detector.
Two 8−bit D−to−A converters may not be used to
construct a 16−bit accurate D−to−A converter. 16−bit
accuracy implies a total of
±1/2 part in 65,536, or
±0.00076%, which is much more accurate than the ±0.19%
specification of the MC1408−8.
MSB
A1
A2
A3
A4
A5
A6
A7
A8A9A10A11 A12
12-BIT
D-TO-A
CONVERTER
ERROR MAX)
0 TO +10V OUTPUT
ERROR (1V = 1%)
NE530
LSB
5
6
7
8
9
10
11
12
MSB
LSB
MC1408
8-BIT
COUNTER
15 16 3
2
1
4
14
13
+
C
(
±0.02%
VCC
VREF = 2V
VEE
0.1
mF
R14
Figure 5. Relative Accuracy
5k
W
50k
W
1k
W
100
W
950
W


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