參數(shù)資料
型號(hào)： OPA681N
英文描述： Wideband, Current Feedback OPERATIONAL AMPLIFIER With Disable
中文描述： 寬帶，電流反饋運(yùn)算放大器，禁用
文件頁(yè)數(shù)： 13/21頁(yè)
文件大?。?/td> 241K
代理商： OPA681N
OPA681
13
FIGURE 4. Two-Channel Video Multiplexer.
The section on Disable Operation shows the turn-on and
turn-off switching glitches using a grounded input for a
single channel is typically less than
±
50mV. Where two
outputs are switched (as shown in Figure 6), the output line
is always under the control of one amplifier or the other due
to the “make-before-break” disable timing. In this case, the
switching glitches for two 0V inputs drop to <20mV.
SINGLE-SUPPLY “IF” AMPLIFIER
The high bandwidth provided by the OPA681 while operat-
ing on a single +5V supply lends itself well to IF amplifier
applications. One of the advantages of using an op amp like
the OPA681 as an IF amplifier is that precise signal gain is
achieved along with much lower 3rd-order intermodulation
versus quiescent power dissipation. In addition, the OPA681
in the SOT23-6 package offers a very small package with a
power shutdown feature for portable applications. One con-
cern with using op amps for an IF amplifier is their relatively
high noise figures. It is sometimes suggested that an opti-
mum source resistance can be used to minimize op amp
noise figure. Adding a resistor to reach this optimum value
may improve noise figure, but will actually decrease the
signal-to-noise ratio. A more effective way to move towards
an optimum source impedance is to bring the signal in
through an input transformer. Figure 5 shows an example
that is particularly useful for the OPA681.
FIGURE 5. Low Noise, Single Supply, IF Amplifier.
R
F
600
V
O
V
I
= 3V/V (9.54dB)
R
G
200
OPA681
+5V
DIS
Power Supply
de-coupling not shown
V
I
V
O
50
Load
50
50
Source
1:2
5k
5k
1μF
0.1μF
Bringing the signal in through a step up transformer to the
inverting input gain resistor has several advantages for the
OPA681. First, the decoupling capacitor on the non-invert-
ing input eliminates the contribution of the non-inverting
input current noise to the output noise. Secondly, the non-
inverting input noise voltage of the op amp is actually
OPA681
2k
82.5
75
Cable
RG-59
82.5
75
402
340
Video 1
+5V
+5V
–5V
OPA681
2k
75
402
340
Video 2
–5V
+5V
V
DIS
DIS
DIS
相關(guān)PDF資料
PDF描述
OPA681P Wideband, Current Feedback OPERATIONAL AMPLIFIER With Disable
OPA681DATASHEET OPA681 Data Sheet - SpeedPlus Wideband. Current Feedback OPERATIONAL AMPLIFIER With Disable
OPA682U Wideband, Fixed Gain BUFFER AMPLIFIER With Disable
OPA682 Wideband, Fixed Gain BUFFER AMPLIFIER With Disable
OPA682N Wideband, Fixed Gain BUFFER AMPLIFIER With Disable
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA681N/250 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:
OPA681N/3K 制造商:Rochester Electronics LLC 功能描述:- Bulk
OPA681P 功能描述:高速運(yùn)算放大器 DIP-8 WB Current-Fd RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA681U 功能描述:高速運(yùn)算放大器 SOIC-8 WB Current-F RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA681U/2K5 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier
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