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DAC1007LCN 数据表(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 DAC1007LCN
功能描述  uP Compatible, Double-Buffered D to A Converters
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

DAC1007LCN 数据表(HTML) 10 Page - National Semiconductor (TI)

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52 Analog Operation in the Voltage Switching Mode
Some useful application circuits result if the R-2R ladder is
operated in the voltage switching mode There are two very
important things to remember when using the DAC in the
voltage mode The reference voltage (aV) must always be
positive since there are parasitic diodes to ground on the
IOUT1 pin which would turn on if the reference voltage went
negative To maintain a degradation of linearity less than
g
0005% keep aV s 3VDC and VCC at least 10V more
positive than aV
Figures 6 and 7 show these errors for the
voltage switching mode This operation appears unusual
since a reference voltage (aV) is applied to the IOUT1 pin
and the voltage output is the VREF pin This basic idea is
shown in
Figure 8
This VOUT range can be scaled by use of a non-inverting
gain stage as shown in
Figure 9
Notice that this is unipolar operation since all voltages are
positive A bipolar output voltage can be obtained by using a
single op amp as shown in
Figure 10 For a digital input
code of all zeros the output voltage from the VREF pin is
zero volts The external op amp now has a single input of
a
V and is operating with a gain of b1 to this input The
output of the op amp therefore will be at bV for a digital
input of all zeros As the digital code increases the output
voltage at the VREF pin increases
Notice that the gain of the op amp to voltages which are
applied to the (a) input is a2 and the gain to voltages
which are applied to the input resistor R is b1 The output
voltage of the op amp depends on both of these inputs and
is given by
VOUTe(aV) (b1)aVREF(a2)
FIGURE 6
FIGURE 7
DIGITAL INPUT CODE
FIGURE 8 Voltage Mode Switching
TLH5688 – 12
FIGURE 9 Amplifying the Voltage Mode Output (Single Supply Operation)
10


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