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參數資料
型號: OP490
廠商: Analog Devices, Inc.
元件分類: 運動控制電子
英文描述: Low Voltage Micropower Quad Operational Amplifier
中文描述: 低電壓,微功耗四運算放大器
文件頁數: 11/12頁
文件大?。?/td> 241K
代理商: OP490
OP490
REV. B
–11–
Figure 4. High Output Amplifier
HIGH OUT PUT AMPLIFIE R
T he amplifier shown in Figure 4 is capable of driving 25 V p-p
into a 1 k
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 am-
plifier with the component values shown is 10, but can easily be
changed by varying R1 or R2.
SINGLE -SUPPLY MICROPOWE R QUAD
PROGRAMMABLE GAIN AMPLIFIE R
T he 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
μ
A. T he digital code
present at the DAC, which is easily set by a microprocessor, de-
termines the ratio between the fixed DAC feedback resistor and
the resistance of the DAC ladder presents to the op amp feed-
back loop. 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 con-
sists of all zeros, the feedback loop will be open causing the op
amp output 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 accuracy. T he 2.5 V reference biases the
amplifiers to the center of the linear region providing maximum
output swing.
相關PDF資料
PDF描述
OP490G Low Voltage Micropower Quad Operational Amplifier
OP490E Low Voltage Micropower Quad Operational Amplifier
OP490F Low Voltage Micropower Quad Operational Amplifier
op490 Low Voltage Micropower Quad Operational Amplifier(低電壓微功率四運放)
op492 Quad OP AMP(四運算放大器)
相關代理商/技術參數
參數描述
OP4900046S 制造商:Rochester Electronics LLC 功能描述:- Bulk
OP490019S 制造商:Analog Devices 功能描述:
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OP490ATC/883 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Voltage Micropower Quad Operational Amplifier
OP490AY 制造商:Rochester Electronics LLC 功能描述:
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