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參數資料
| 型號： | op490 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Voltage Micropower Quad Operational Amplifier(低電壓微功率四運放) |
| 中文描述： | 低電壓，微功耗四運算放大器（低電壓微功率四運放） |
| 文件頁數： | 11/12頁 |
| 文件大小： | 251K |
| 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 |
|---|---|
| op492 | Quad OP AMP(四運算放大器) |
| op292 | Dual OP AMP(雙運算放大器) |
| OP492 | DUAL/QUAD SINGLE SUPPLY OPERATIONAL AMPLIFIER |
| OP492GBC | DUAL/QUAD SINGLE SUPPLY OPERATIONAL AMPLIFIER |
| OP492GP | DUAL/QUAD SINGLE SUPPLY OPERATIONAL AMPLIFIER |
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: |
| OP490-019S | 制造商:Analog Devices 功能描述: |
| 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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