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參數(shù)資料
| 型號(hào)： | DAC7811IDRCT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 12-Bit, Serial Input, Multiplying Digital-to-Analog Converter |
| 中文描述： | 12位，串行輸入，乘法數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 698K |
| 代理商： | DAC7811IDRCT |
www.ti.com
P
V
OUT
R
FB
C
1
I
OUT1
0
≤
V
OUT
≤
+2.5V
GND
GND
2.5V
V
OUT
V
IN
V
REF
+2.5V Reference
V
DD
V
DD
DAC7811
OPA277
OPA277
I
OUT2
Bipolar Output Section
The DAC7811, as a 2-quadrant multiplying DAC, can be used to generate a unipolar output. The polarity of the
full-scale output I
OUT
is the inverse of the input reference voltage at V
REF
.
Some applications require full 4-quadrant multiplying capabilities or bipolar output swing. As shown in Figure 31,
external op amp U4 is added as a summing amp and has a gain of 2X that widens the output span to 5 V. A
4-quadrant multiplying circuit is implemented by using a 2.5 V offset of the reference voltage to bias U4.
According to the circuit transfer equation given in Equation 2, input data (D) from code 0 to full-scale produces
output voltages of V
OUT
= –2.5 V to V
OUT
= +2.5 V.
V
OUT
D
0.5
2
N
1
V
REF
(2)
I
OUT1
R
FB
C
1
GND
V
DD
V
DD
+2.5V
(+10V)
V
REF
V
OUT
C
2
U4
OPA277
10k
10k
5k
2.5V
≤
V
OUT
≤
+2.5V
(
10V
≤
V
OUT
≤
+10V)
U2
OPA277
DAC7811
I
OUT2
Programmable Current Source Circuit
A DAC7811 can be integrated into the circuit in Figure 32 to implement an improved Howland current pump for
precise voltage to current conversions. Bidirectional current flow and high voltage compliance are two features of
the circuit. With a matched resistor network, the load current of the circuit is shown by Equation 3:
I
L
R2
R3
R3
R1
V
REF
D
(3)
DAC7811
SBAS337–APRIL 2005
APPLICATION INFORMATION (continued)
Figure 30. Positive Voltage Output Circuit
External resistance mismatching is the significant error in Figure 31.
Figure 31. Bipolar Output Circuit
13
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