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DAC708 数据表(PDF) 9 Page - Texas Instruments

部件名 DAC708
功能描述  Microprocessor-Compatible 16-BIT DIGITAL-TO-ANALOG CONVERTERS
Download  13 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

DAC708 数据表(HTML) 9 Page - Texas Instruments

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9
®
DAC707/708/709
In Figures 7 and 8, lead and contact resistances are repre-
sented by R
1 through R5. As long as the load resistance RL
is constant, R
2 simply introduces a gain error and can be
removed with gain calibration. R
3 is part of RL if the output
voltage is sensed at ANALOG COMMON.
Figures 8 and 9 show two methods of connecting the current
output model with an external precision output op amp. By
sensing the output voltage at the load resistor (connecting R
F
to the output of the amplifier at R
L) the effect of R1 and R2
is greatly reduced. R
1 will cause a gain error but is indepen-
dent of the value of R
L and can be eliminated by initial
calibration adjustments. The effect of R
2 is negligible be-
cause it is inside the feedback loop of the output op amp and
is therefore greatly reduced by the loop gain.
In many applications it is impractical to sense the output
voltage at ANALOG COMMON. Sensing the output volt-
age at the system ground point is permissible because these
converters have separate analog and digital common lines
and the analog return current is a near-constant 2mA and
varies by only 10
µA to 20µA over the entire input code
range. R
4
can be as large as 3
Ω without adversely affecting
the linearity of the D/A converter. The voltage drop across
R
4
is constant and appears as a zero error that can be nulled
with the zero calibration adjustment.
Another approach senses the output at the load as shown in
Figure 9. In this circuit the output voltage is sensed at the
load common and not at the D/A converter common as in the
previous circuits. The value of R
6 and R7 must be adjusted
for maximum common-mode rejection across R
L. The effect
of R
4 is negligible as explained previously.
The D/A converter and the wiring to its connectors should be
located to provide optimum isolation from sources of RFI
and EMI. The key to elimination of RF radiation or pickup
is small loop area. Signal leads and their return conductors
should be kept close together such that they present a small
flux-capture cross section for any external field.
FIGURE 9. Alternate Connection for Ground Sensing at the
Load (Current Output Models).
5
6
7
DAC
RF
R
1
R
2
3
R
R
R
R
R
Sense
Output
To System Ground
L
R
DAC708
4k
2k
10k
2mA
+1%
0 to
2mA
Micro-
Processor
Interface
RF
L
2
CC
DD
4
3
R
R
R
R
1µF
+
1µF
+
1µF
+
+V
V
±V
CC
Digital
Common
Analog
Common
Alternate Ground
Sense Connection
System
Ground
DD
V
–VCC
Supply
Supply
Sense
Output
Digital
Common
Analog Common
DAC707/709
FIGURE 7. DAC707/709 Bipolar Output Circuit (Voltage
Out).
1
R
2.45k
10k
Micro-
Processor
Interface
RF
L
2
CC
DD
3
R
R
R
1µF
+
1µF
+
1µF
+
+V
V
±V
CC
Digital
Common
Analog
Common
Alternate Ground
Sense Connection
System
Ground
DD
V
–VCC
Supply
Supply
Sense
Output
Digital
Common
Analog Common
B
R
1
RF
IOUT
DAC708
4
R
FIGURE 8. DAC708 Bipolar Output Circuit (with External
Op Amp).


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