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参数资料
| 型号： | OP493 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Precision, Micropower Operational Amplifiers(精密的微功率四运放) |
| 中文描述： | 精密，微功耗运算放大器（精密的微功率四运放） |
| 文件页数： | 14/16页 |
| 文件大小： | 273K |
| 代理商： | OP493 |
REV. A
–14–
OP193/OP293/OP493
V
OUT
A
1/4 OP493
A
2
3
R1
100k
11
1
2
V
REF
A
I
OUT1A
I
OUT1B
4
5
6
I
OUT2A/2B
DAC A
1/4
DAC8408
DAC B
1/4
DAC8408
I
OUT1C
DAC C
1/4
DAC8408
I
OUT1D
DAC D
1/4
DAC8408
V
OUT
B
1/4 OP493
B
6
5
R2
100k
7
8
V
REF
B
V
OUT
C
1/4 OP493
C
13
12
R3
100k
14
27
V
REF
C
V
OUT
D
1/4 OP493
D
9
10
R4
100k
8
21
V
REF
D
DAC DATA BUS
PINS 9(LSB)–16(MSB)
24I
OUT2C/2D
23
25
+5V
1
V
DD
AD589
1.23V
+5V
17
18
19
20
A/B
R/W
DS1
DS2
DAC8408ET
DIGITAL
CONTROL
SIGNALS
28
DGND
OP493
4
+5V
3.6k
Figure 35. Micropower Single-Supply Quad Voltage-
Output 8-Bit DAC
A Single-Supply Micropower Quad Programmable-Gain
Amplifier
T he combination of the quad OP493 and the DAC8408 quad
8-bit CMOS DAC creates a quad programmable gain amplifier
with a quiescent supply drain of only 140
μ
A (Figure 36). T he
digital code present at the DAC, which is easily set by a micro-
processor, determines the ratio between the fixed DAC feedback
resistor and the resistance that the DAC feedback ladder pre-
sents to the op amp feedback loop. T he gain of each amplifier is:
V
OUT
V
IN
=
256
n
where
n
equals the decimal equivalent of the 8-bit digital code
present at the DAC.
If the digital code present at the DAC consists of all zeros, the
feedback loop will be open causing the op amp to saturate. T he
10 M
resistors placed in parallel with the DAC feedback loop
eliminates this problem with a very small reduction in gain accu-
racy. T he 2.5 V reference biases the amplifiers to the center of
the linear region providing maximum output swing.
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PDF描述 |
|---|---|
| OP497GS | Precision Picoampere Input Current Quad Operational Amplifier |
| OP497 | Precision Picoampere Input Current Quad Operational Amplifier |
| OP497AY | Precision Picoampere Input Current Quad Operational Amplifier |
| OP497CY | Precision Picoampere Input Current Quad Operational Amplifier |
| OP497FP | Precision Picoampere Input Current Quad Operational Amplifier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| OP4930003SR | 制造商:Analog Devices 功能描述: |
| OP493EP | 制造商:Rochester Electronics LLC 功能描述:MICROPOWER RAIL/RAIL - Bulk |
| OP493ES | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision, Micropower Operational Amplifiers |
| OP493ES-REEL | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision, Micropower Operational Amplifiers |
| OP493FP | 制造商:Rochester Electronics LLC 功能描述:MICROPOWER RAIL/RAIL - Bulk 制造商:Analog Devices 功能描述: |
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