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參數(shù)資料
| 型號： | EL2286C |
| 英文描述： | 250 MHz/3 mA Dual Current Mode Feedback Amplifier(250 MHz/3 mA，雙路電流模式反饋放大器) |
| 中文描述： | 250兆赫/3毫安雙路電流模式反饋放大器（250兆赫/ 3毫安，雙路電流模式反饋放大器） |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 358K |
| 代理商： | EL2286C |
EL2186CEL2286C
250 MHz3 mA Current Mode Feedback Amp wDisable
Applications Information
Contd
ential Gain could only be achieved by running
high idle currents through the output transistors
(to reduce variations in output impedance)
These currents were typically comparable to the
entire 3 mA supply current of each EL2186C
EL2286C amplifier Special circuitry has been in-
corporated in the EL2186CEL2286C to reduce
the variation of output impedance with current
output This results in dG and dP specifications
of 005% and 005 while driving 150
X at a gain
of a2
Video Performance has also been measured with
a 500
X load at a gain of a1 Under these condi-
tions the EL2186CEL2286C have dG and dP
specifications of 001% and 001
respectively
while driving 500
X at AV ea1
Output Drive Capability
In spite of its low 3 mA of supply current the
EL2186C is capable of providing a minimum of
g
80 mA of output current Similarly each am-
plifier of the EL2286C is capable of providing a
minimum of g50 mA These output drive levels
are unprecedented in amplifiers running at these
supply currents With a minimum g80 mA of
output drive the EL2186C is capable of driving
50
X loads to g4V making it an excellent choice
for driving isolation transformers in telecommu-
nications applications Similarly the g50 mA
minimum output drive of each EL2286C amplifi-
er allows swings of g25V into 50
X loads
Driving Cables and Capacitive Loads
When used as a cable driver double termination
is always recommended for reflection-free per-
formance For those applications the back-termi-
nation series resistor will decouple the EL2186C
EL2286C from the cable and allow extensive ca-
pacitive drive However other applications may
have high capacitive loads without a back-termi-
nation resistor
In these applications
a small
series resistor (usually between 5
X and 50X) can
be placed in series with the output to eliminate
most peaking The gain resistor (RG) can then be
chosen to make up for any gain loss which may
be created by this additional resistor at the out-
put In many cases it is also possible to simply
increase the value of the feedback resistor (RF)to
reduce the peaking
Current Limiting
The EL2186CEL2286C have no internal cur-
rent-limiting circuitry If any output is shorted
it is possible to exceed the Absolute Maximum
Ratings for output current or power dissipation
potentially resulting in the destruction of the de-
vice
Power Dissipation
With the high output drive capability of the
EL2186CEL2286C it is possible to exceed the
150 C Absolute Maximum junction temperature
under certain very high load current conditions
Generally speaking when RL falls below about
25
X it is important to calculate the maximum
junction temperature (TJmax) for the application
to determine if power-supply voltages load con-
ditions or package type need to be modified for
the EL2186CEL2286C to remain in the safe op-
erating area These parameters are calculated as
follows
TJMAX e TMAX a (iJA n PDMAX)
1
where
TMAX
e
Maximum Ambient Temperature
iJA
e
Thermal Resistance of the Package
n
e
Number of Amplifiers in the Pack-
age
PDMAX e Maximum Power Dissipation of
Each Amplifier in the Package
PDMAX for each amplifier can be calculated as
follows
PDMAX e (2 VS ISMAX) a
(VS b VOUTMAX) (VOUTMAX RL)
2
where
VS
e
Supply Voltage
ISMAX
e
Maximum Supply Current of
1 Amplifier
VOUTMAX e Max Output Voltage of the
Application
RL
e
Load Resistance
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL2286CN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:250MHz/3mA Current Mode Feedback Amp w/Disable |
| EL2286CS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2286CS-T13 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2286CS-T7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL228-AA-1 | 制造商:SIXNET 制造商全稱:SIXNET 功能描述:Heavy Industrial Ethernet Managed Switch |
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