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參數(shù)資料
| 型號(hào)： | EL2020C |
| 英文描述： | 50 MHz Current Feedback Amplifier(50 MHz 電流反饋放大器) |
| 中文描述： | 50 MHz電流反饋放大器（50 MHz的電流反饋放大器） |
| 文件頁(yè)數(shù)： | 5/20頁(yè) |
| 文件大?。?/td> | 409K |
| 代理商： | EL2020C |
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EL2020C
50 MHz Current Feedback Amplifier
Application Information
Contd
Video Distribution Amplifier
The distribution amplifier shown below features
a difference input to reject common mode signals
on the 75
X coax cable input Common mode re-
jection is often necessary to help to eliminate
60 Hz noise found in production environments
Video Distribution Amplifier
with Difference Input
2020 – 15
EL2020 DisableEnable Operation
The EL2020 has an enabledisable control input
at pin 8 The device is enabled and operates nor-
mally when pin 8 is left open or returned to pin 7
VCC When more than 250 mA is pulled from pin
8 the EL2020 is disabled The output becomes a
high impedance the inverting input is no longer
driven to the positive input voltage and the sup-
ply current is halved To make it easy to use this
feature there is an internal resistor to limit the
current to a safe level (E11 mA) if pin 8 is
grounded
To draw current out of pin 8 an ‘‘open collector
output’’ logic gate or a discrete NPN transistor
can be used This logic interface method has the
advantage of level shifting the logic signal from
5V supplies to whatever supply the EL2020 is op-
erating on without any additional components
Using the EL2020 as a Multiplexer
An interesting use of the enable feature is to com-
bine several amplifiers in parallel with their out-
puts common This combination then acts simi-
lar to a MUX in front of an amplifier A typical
circuit is shown
When the EL2020 is disabled the DC output im-
pedance is very high over 10 k
X However there
is also an output capacitance that is non-linear
For signals of less than 5V peak to peak the out-
put capacitance looks like a simple 15 pF capaci-
tor However for larger signals the output capac-
itance becomes much larger and non-linear
The example multiplexer will switch between
amplifiers in 5
ms for signals of less than g2V on
the outputs For full output signals of 20V peak
to peak the selection time becomes 25
ms The
disabled outputs also present a capacitive load
and therefore only three amplifiers can have their
outputs shorted together However an unlimited
number can sum together if a small resistor
(25
X) is inserted in series with each output to
isolate it from the ‘‘bus’’ There will be a small
gain loss due to the resistors of course
Using the EL2020 as a Multiplexer
2020 – 16
13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EL2030 | 120 MHz Current Feedback Amplifier |
| EL2030C | 120 MHz Current Feedback Amplifier |
| EL2030CM | 120 MHz Current Feedback Amplifier |
| EL2030CN | 120 MHz Current Feedback Amplifier |
| EL2033CN | 100MHz Video Line Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL2020CJ/E+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier |
| EL2020CM | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:50MHz Current Feedback Amplifier |
| EL2020CN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:50MHz Current Feedback Amplifier |
| EL2020CN/E+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier |
| EL2020CPL | 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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