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参数资料
| 型号： | OP490E |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 运动控制电子 |
| 英文描述： | Low Voltage Micropower Quad Operational Amplifier |
| 中文描述： | 低电压，微功耗四运算放大器 |
| 文件页数： | 12/16页 |
| 文件大小： | 206K |
| 代理商： | OP490E |
REV. C
OP490
–12–
High Output Amplifier
The amplifier shown in Figure 7 is capable of driving 25 V p-p
into a 1 k
W
load. Design of the amplifier is based on a bridge
configuration. A amplifies the input signal and drives the load
with the help of B. Amplifier C is a unity-gain inverter which
drives the load with help from D. Gain of the high output amplifier
with the component values shown is 10, but can easily be changed
by varying R1 or R2.
Single-Supply Micropower Quad Programmable Gain Amplifier
The combination of quad OP490 and the DAC8408 quad 8-bit
CMOS DAC, creates a quad programmable-gain amplifier with
a quiescent supply drain of only 140
m
A. The digital code present
at the DAC, which is easily set by a microprocessor, determines
the ratio between the fixed DAC feedback resistor and the resis-
tance of the DAC ladder presents to the op amp feedback loop.
Gain of each amplifier is:
V
V
n
OUT
IN
= -
256
+15V
–15V
1/4
OP490E
B
1
R1
1k
V
IN
2
3
11
4
R2
9k
1/4
OP490E
B
7
6
5
R3
50
R4
50
R
L
R8
50
8
1/4
OP490E
C
13
12
9
10
1/4
OP490E
D
R6
5k
R7
50
R5
5k
14
Figure 7. High Output Amplifier
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 output to saturate. The 10 M
W
resistors placed in paral-
lel with the DAC feedback loop eliminates this problem with a
very small reduction in gain accuracy. The 2.5 V reference biases
the amplifiers to the center of the linear region providing maximum
output swing.
相关PDF资料 |
PDF描述 |
|---|---|
| OP490F | Low Voltage Micropower Quad Operational Amplifier |
| op490 | Low Voltage Micropower Quad Operational Amplifier(低电压微功率四运放) |
| op492 | Quad OP AMP(四运算放大器) |
| op292 | Dual OP AMP(双运算放大器) |
| OP492 | DUAL/QUAD SINGLE SUPPLY OPERATIONAL AMPLIFIER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| OP490EY | 制造商:Rochester Electronics LLC 功能描述:MICROPOWER QUAD OP AMP IC - Bulk 制造商:Analog Devices 功能描述: |
| OP490F | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Voltage Micropower Quad Operational Amplifier |
| OP490FY | 制造商:Rochester Electronics LLC 功能描述:MICROPOWER QUAD OP AMP IC - Bulk 制造商:Analog Devices 功能描述: |
| OP490G | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Voltage Micropower Quad Operational Amplifier |
| OP490GBC | 制造商:Analog Devices 功能描述: |
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