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DAC1006 Datasheet(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza DAC1006
Descripción Electrónicos  uP Compatible, Double-Buffered D to A Converters
Download  22 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

DAC1006 Datasheet(HTML) 9 Page - National Semiconductor (TI)

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shown in
Figure 4 where the sign of the reference voltage
has been changed to provide a positive output voltage Note
that the output current IOUT1 now flows through the RFB
pin
512 Providing a Bipolar Output Voltage with the
DAC in the Current Switching Mode
The addition of a second op amp to the circuit of
Figure 4
can be used to generate a bipolar output voltage from a
fixed reference voltage
Figure 5 This in effect gives sign
significance to the MSB of the digital input word to allow two
quadrant multiplication of the reference voltage The polarity
of the reference can also be reversed to realize the full four-
quadrant multiplication
The applied digital word is offset binary which includes a
code to output zero volts without the need of a large valued
resistor common to existing bipolar multiplying DAC circuits
Offset binary code can be derived from 2’s complement
data (most common for signed processor arithmetic) by in-
verting the state of the MSB in either software or hardware
After doing this the output then responds in accordance to
the following expression
VOeVREFc
D
512
where VREF can be positive or negative and D is the signed
decimal equivalent of the 2’s complement processor data
(b512sDsa511 or 1000000000sDs0111111111) If the
applied digital input is interpreted as the decimal equivalent
of a true binary word VOUT can be found by
VOeVREF
Db512
512
J
0sDs1023
With this configuration only the offset voltage of amplifier 1
need be nulled to preserve linearity of the DAC The offset
voltage error of the second op amp has no effect on lineari-
ty It presents a constant output voltage error and should be
nulled only if absolute accuracy is needed Another advan-
tage of this configuration is that the values of the external
resistors required do not have to match the value of the
internal DAC resistors they need only to match and temper-
ature track each other
A thin film 4 resistor network available from Beckman Instru-
ments Inc (part no 694-3-R10K-D) is ideally suited for this
application Two of the four available 10 kX resistor can be
paralleled to form R in
Figure 5 and the other two can be
used separately as the resistors labeled 2R
Operation is summarized in the table below
Applied
2’s Comp
2’s Comp
Applied
True Binary
VOUT
(Decimal)
(Binary)
Digital Input
(Decimal)
a
VREF
b
VREF
a
511
0111111111
1111111111
1023
VREFb1 LSB
b
lVREFla1 LSB
a
256
0100000000
1100000000
768
VREF 2
b
lVREFl 2
0
0000000000
1000000000
512
0
0
b
1
1111111111
0111111111
511
b
1 LSB
a
1 LSB
b
256
1100000000
0100000000
256
b
VREF 2
a
lVREFl 2
b
512
1000000000
0000000000
0
b
VREF
a
lVREFl
with 1 LSBel
VREF
l
512
FIGURE 4 Providing a Unipolar Output Voltage
TLH5688 – 11
FIGURE 5 Providing a Bipolar Output Voltage with the DAC in the Current Switching Mode
9


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