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參數(shù)資料
| 型號(hào)： | EL2090C |
| 元件分類： | 視頻放大器 |
| 英文描述： | 100 MHz DC-Restored Video Amplifier(100 MHz直流恢復(fù)型視頻放大器) |
| 中文描述： | 100兆赫的DC -恢復(fù)視頻放大器（100兆赫直流恢復(fù)型視頻放大器） |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 260K |
| 代理商： | EL2090C |
EL2090C
100 MHz DC-Restored Video Amplifier
Typical Performance Curves
Contd
Maximum Power Dissipation
vs Ambient Temperature
14-Pin PDIP and 16-Pin SOL
2090 – 10
Applications Information
The EL2090C is a general purpose component
and thus the video amplifier and sample-and-
hold pins are uncommitted Therefore much of
the ultimate performance as a DC-restored video
amplifier will be set by external component val-
ues and parasitics Some application considera-
tions will be offered here
The DC feedback from the sample-and-hold can
be applied to either positive or negative inputs of
the video amplifier (with appropriate phasing of
the sample-and-hold amplifier inputs) We will
consider feedback to the inverting video input
During a sample mode (the HOLD input at a log-
ic low) the sample-and-hold acts as a simple null-
ing op-amp
Ideally the DC feedback resistor Raz is a high
value so as not to couple a large amount of the
AC signal on the video input back to the sample-
and-hold amplifier output The sample-and-hold
output is a low impedance at high frequencies
but variations of the DC operating point will
change the output impedance somewhat
No
more than a few ohms output impedance change
will occur but this can cause gain variations in
the
001%
realm
This
DC-dependent
gain
change is in fact a differential gain effect Some
small differential phase error will also be added
The best approach is to maximize the DC feed-
back resistor value so as to isolate the sample-
and-hold from the video path as much as possi-
ble Values of 1 k
X or above for Raz will cause
little to no video degradation
This suggests that the largest applicable power
supply voltages be used so that the output swing
of the sample-and-hold can still correct for the
variations of DC offset in the video input with
large values of Raz The typical application cir-
cuit shown will allow correction of g1V inputs
with good isolation of the sample-and-hold out-
put Good isolation is defined as no video degra-
dation due to the insertion of the sample-and-
hold loop Lower supply voltages will require a
smaller value of DC feedback resistor to retain
correction of the full input DC variation The
EL2090 differential phase performance is opti-
mum at g9V supplies and differential gain only
marginally improves above this voltage Since all
video characteristics mildly degrade with increas-
ing die temperature the g9V levels are some-
what better than
g
15V supplies
However
g
15V supplies are quite usable
Ultimate video performance especially in HDTV
applications can also be optimized by setting the
black-level reference such that the signal span at
the video amplifier’s output is set to its optimum
range For instance setting the span to g1V of
output is preferable to a span of 0V to a2V The
curves of differential gain and phase versus input
DC offset will serve as guides
The DC feedback resistor may be split so that a
bypass capacitor is added to reduce the initially
small sample-and-hold transients to even smaller
levels The corruption can be reduced to as low as
1 mV peak seen at the video amplifier output
The size of the capacitor should not be so large as
to de-stabilize the sample-and-hold feedback
loop nor so small as to reduce the video amplifi-
er’s gain flatness A resistor or some other video
isolation network should be inserted between the
video amplifier output and the sample-and-hold
input to prevent excessive video from bleeding
through the autozero section as well as prevent-
ing spurious DC correction due to video signals
confusing the sample-and-hold during autozero
events Figure 1 shows convenient component
values A full 358 MHz trap is not necessary for
suppressing NTSC chroma burst interaction with
the sample-and-hold input the simple R-C net-
work suggested in Figure 1 suffices
7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL2090CM | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:100MHz DC-Restored Video Amplifier |
| EL2090CN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:100MHz DC-Restored Video Amplifier |
| EL2099 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Video Distribution Amplifier |
| EL2099C | 制造商:ELANTEC 制造商全稱:ELANTEC 功能描述:Video Distribution Amplifier |
| EL2099CT | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Video Distribution Amplifier |
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