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參數(shù)資料
| 型號： | DAC8012AR |
| 英文描述： | 12-Bit Digital-to-Analog Converter |
| 中文描述： | 12位數(shù)字到模擬轉換器 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 211K |
| 代理商： | DAC8012AR |
8
DAC80/80P
CURRENT OUTPUT MODELS
The resistive scaling network and equivalent output circuit
of the current model differ from the voltage model and are
shown in Figures 7 and 8.
Internal scaling resistors (Figure 7) are provided to scale an
external op amp or to configure load resistors for a voltage
output. These connections are described in the following
sections.
If the internal resistors are not used for voltage scaling,
external R
(or R
) resistors should have a TCR of
±
25ppm/
°
C or less to minimize drift. This will typically add
±
50ppm/
°
C plus the TCR of R
L
(or R
F
) to the total drift.
Driving An External Op Amp
The current output model DAC80 will drive the summing
junction of an op amp used as a current-to-voltage converter
to produce an output voltage. See Figure 9.
V
OUT
= I
OUT
x
R
F
where I
is the DAC80 output current and R
is the
feedback resistor. Using the internal feedback resistors of
Range
Digital
Input Codes
Connect
Pin 15 to Pin 17 to
Connect
Connect
Pin 19 to
Connect
Pin 16
to
±
10
±
5
±
2.5V
0 to +10V
0 to +5V
COB or CTC
COB or CTC
COB or CTC
CSB
CSB
19
18
18
18
18
20
20
20
21
21
15
NC
20
NC
20
24
24
24
24
24
TABLE III. Output Voltage Range Connections for Voltage
Models.
6.3k
(1)
Reference Input
To Reference Control Circuit
NOTE: (1) Resistor Tolerances: ±2% max.
19
17
16
3k
(1)
2k
(1)
5k
(1)
20
15
18
FIGURE 7. Internal Scaling Resistors.
FIGURE 8. Current Output Model Equivalent Output Circuit.
To
Reference
Control
Circuit
24 Reference Out
17 Bipolar Offset
21 Common
15 I
OUT
16 Reference Input
R
6.6k
6.3k
I
6.3V
+
–
0 to
2mA
FIGURE 9. External Op-Amp—Using Internal Feedback
Resistors.
19
18
21
15
6.6k
5k
I
0 to
2mA
OPA604
(1)
A
10V Range
20V Range
5k
V
OUT
NOTE: (1) For fast settling.
the current output model DAC80 provides output voltage
ranges the same as the voltage model DAC80. To obtain the
desired output voltage range when connecting an external op
amp, refer to Table IV.
Output
Range
Digital
Input Codes
Connect
A to
Connect
Pin 17 to
Connect
Pin 19 to
Connect
Pin 16 to
±
10V
±
5V
±
2.5V
0 to +10V
0 to +5V
COB or CTC
COB or CTC
COB or CTC
CSB
CSB
19
18
18
18
18
15
15
15
21
21
A
24
24
24
24
24
NC
15
NC
15
TABLE IV. Voltage Range of Current Output.
Output 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
value of
±
1mA for bipolar voltage ranges and
–2mA for unipolar voltage ranges. See Figure 10. Use
protection diodes when a high voltage op amp is used.
The feedback resistor, R
, should have a temperature coef-
ficient as low as possible. Using an external feedback
resistor, overall drift of the circuit increases due to the lack
of temperature tracking between R
and the internal scaling
resistor network. This will typically add 50ppm/
°
C plus R
F
drift to total drift.
FIGURE 10. External Op-Amp—Using External Feedback
Resistors.
24
17
21
15
16
6.6k
6.3k
I
0 to
2mA
+
–
6.3k
R
F
BB3582J
(1)
NOTE: (1) For output voltage swings up to 290V p-p.
V
OUT
相關PDF資料 |
PDF描述 |
|---|---|
| DAC8012BR | 12-Bit Digital-to-Analog Converter |
| DAC8012ER | 12-Bit Digital-to-Analog Converter |
| DAC8012FP | 12-Bit Digital-to-Analog Converter |
| DAC8012FPC | 12-Bit Digital-to-Analog Converter |
| DAC8012FR | 12-Bit Digital-to-Analog Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DAC8012BR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:12-Bit Digital-to-Analog Converter |
| DAC8012ER | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| DAC8012FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:12-Bit Digital-to-Analog Converter |
| DAC8012FPC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| DAC8012FR | 制造商:Analog Devices 功能描述: |
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