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DAC702SH Datasheet(PDF) 10 Page - Texas Instruments

No. de pieza DAC702SH
Descripción Electrónicos  Monolithic 16-Bit DIGITAL-TO-ANALOG CONVERTERS
Download  11 Pages
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

DAC702SH Datasheet(HTML) 10 Page - Texas Instruments

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10
®
DAC701, 702, 703
APPLICATIONS
DRIVING AN EXTERNAL OP AMP
WITH CURRENT OUTPUT D/AS
DAC702 is current output devices and will drive the sum-
ming junction of an op amp to produce an output voltage as
shown in Figure 9. Use of the internal feedback resistor is
required to obtain specified gain accuracy and low gain drift.
DAC702 can be scaled for any desired voltage range with an
external feedback resistor, but at the expense of increased
drifts of up to
±50ppm/°C. The resistors in the DAC702 ratio
track to
±1ppm/°C but their absolute TCR may be as high as
±50ppm/°C.
An alternative method of scaling the output voltage of the
D/A converter and preserving the low gain drift is shown in
Figure 10.
OUTPUTS LARGER THAN 20V RANGE
For output voltage ranges larger than
±10V, a high voltage
op amp may be employed with an external feedback resistor.
Use I
OUT values of ±1mA for bipolar voltage ranges and
–2mA for unipolar voltage ranges (see Figure 11). Use
protection diodes as shown when a high voltage op amp is
used.
Common
I
OUT
V
OUT
R
F
5k
4k
0 to
2mA
FIGURE 9. External Op Amp Using Internal Feedback
Resistors.
I
OUT
V
OUT
R
F
5k
4k
0 to
2mA
R
1
I
*
R
2 *
Common
R
1
*, R
2 TCR < ±10ppm/°C
FIGURE 10. External Op Amp Using Internal and External
Feedback Resistors to Maintain Low Gain Drift.
FIGURE 11. External Op Amp Using External Feedback
Resistors.
V
OUT
R
F
4k
0 to
2mA
BB3584
R
F


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