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參數(shù)資料
| 型號： | OPA682U |
| 英文描述： | Wideband, Fixed Gain BUFFER AMPLIFIER With Disable |
| 中文描述： | 寬帶，固定增益緩沖放大器具有禁用 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 213K |
| 代理商： | OPA682U |
15
OPA682
Typically, channel switching is performed either on sync or
retrace time in the video signal. The two inputs are approxi-
mately equal at this time. The “make-before-break” disable
characteristic of the OPA682 ensures that there is always
one amplifier controlling the line when using a wired-OR
circuit like that shown in Figure 4. Since both inputs may be
on for a short period during the transition between channels,
the outputs are combined through the output impedance
matching resistors (68.1
in this case). When one channel
is disabled, its feedback network forms part of the output
impedance and slightly attenuates the signal in getting out
onto the cable. The matching resistors have been set to get
a signal gain of +1 at the load while providing > 20dB return
loss at the load.
The video multiplexer connection (Figure 4) also insures
that the maximum differential voltage across the inputs of
the unselected channel do not exceed the rated
±
1.2V
maximum for standard video signal levels. In any case,
V
OUT
must
be <
±
2.6Vp-p in order to not exceed the absolute
maximum differential input voltage (
±
1.2V) on the disabled
part.
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 4), 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.
DELAY-EQUALIZED LOWPASS FILTER
The circuit in Figure 5 realizes a 5th-order Butterworth
lowpass filter with a –3dB bandwidth of 20MHz and group
delay equalization. This filter is based on the KRC active
filter topology using amplifiers with a fixed positive gain
≥
1.
The OPA682 makes a good amplifier for this type of filter.
The first stage is the group delay equalizer, which is based
on a gain of –1. The second stage has a high-Q pole, and uses
a gain of +2 for minimum component sensitivity. The second
stage also produces a real pole. The last stage has a low-Q
pole, and uses a gain of +1 for minimum component sensi-
tivity.
The component values have been pre-distorted to compensate
for the op amps’s parasitic effects. The low-Q pole section
was placed last to minimize noise peaking in the passband,
while maintaining good dynamic range performance.
FIGURE 5. Butterworth LP Filter with Delay Equalization.
OPA682
115
400
49.9
105
226
400
100pF
220pF
56pF
27pF
V
IN
V
OUT
OPA682
400
400
95.3
226
68pF
39pF
OPA682
400
400
(Open)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA682 | Wideband, Fixed Gain BUFFER AMPLIFIER With Disable |
| OPA682N | Wideband, Fixed Gain BUFFER AMPLIFIER With Disable |
| OPA682P | Wideband, Fixed Gain BUFFER AMPLIFIER With Disable |
| OPA686U | Wideband, Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA686N | Wideband, Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA682U/2K5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Buffer/Voltage Follower |
| OPA683 | 制造商:BB 制造商全稱:BB 功能描述:Wideband, Low-Power, Current Feedback Operational Amplifier |
| OPA683ID | 功能描述:高速運(yùn)算放大器 Very Lo-Pwr Current Feedback 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 |
| OPA683IDBVR | 功能描述:高速運(yùn)算放大器 Very Lo-Pwr Current Feedback 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 |
| OPA683IDBVRG4 | 功能描述:高速運(yùn)算放大器 Very Lo-Pwr Current Feedback 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 |
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