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參數(shù)資料
| 型號： | DAC708 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Microprocessor-Compatible 16-Bit Dightal-To-Analog Converter(微處理器兼容的16位D/A轉(zhuǎn)換器) |
| 中文描述： | 微處理器兼容的16位Dightal到模擬轉(zhuǎn)換器（微處理器兼容的16位的D / A轉(zhuǎn)換器） |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 146K |
| 代理商： | DAC708 |
9
DAC707/708/709
In Figures 7 and 8, lead and contact resistances are repre-
sented by R
through R
. As long as the load resistance R
L
is constant, R
simply introduces a gain error and can be
removed with gain calibration. R
is part of R
L
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
) the effect of R
and R
2
is greatly reduced. R
will cause a gain error but is indepen-
dent of the value of R
and can be eliminated by initial
calibration adjustments. The effect of R
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
μ
A to 20
μ
A over the entire input code
range. R
can be as large as 3
without adversely affecting
the linearity of the D/A converter. The voltage drop across
R
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
and R
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
R
R
F
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
R
F
L
2
4
3
R
R
R
R
1μF+
1μF
+
1μF+
+V
V
±V
Supply
CC
Digital
Common
Analog
Common
Alternate Ground
Sense Connection
System
Ground
DD
V
–V
CC
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
R
F
L
2
3
R
R
R
1μF+
1μF
+
1μF+
+V
V
±V
Supply
CC
Digital
Common
Analog
Common
Alternate Ground
Sense Connection
System
Ground
DD
V
–V
CC
Supply
Sense
Output
Digital
Common
Analog Common
B
R
1
RF
I
OUT
DAC708
4
R
FIGURE 8. DAC708 Bipolar Output Circuit (with External
Op Amp).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC708BH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| DAC709 | 制造商:BB 制造商全稱:BB 功能描述:Microprocessor-Compatible 16-BIT DIGITAL-TO-ANALOG CONVERTERS |
| DAC709BH | 制造商:BB 制造商全稱:BB 功能描述:Microprocessor-Compatible 16-BIT DIGITAL-TO-ANALOG CONVERTERS |
| DAC709KH | 制造商:BB 制造商全稱:BB 功能描述:Microprocessor-Compatible 16-BIT DIGITAL-TO-ANALOG CONVERTERS |
| DAC709KH-2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Microprocessor-Compatible 16-BIT DIGITAL-TO-ANALOG CONVERTERS |
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