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参数资料
| 型号： | EL2180C |
| 英文描述： | 250 MHz/3 mA Single Current Mode Feedback Amplifier(250 MHz/3 mA，单路电流模式反馈放大器) |
| 中文描述： | 250兆赫/三毫安单电流模式反馈放大器（250兆赫/ 3毫安，单路电流模式反馈放大器） |
| 文件页数： | 4/16页 |
| 文件大小： | 347K |
| 代理商： | EL2180C |
EL2180CEL2280CEL2480C
250 MHz3 mA Current Mode Feedback Amplifiers
Applications Information
Contd
Video Performance has also been measured with
a 500
X load at a gain of a1 Under these condi-
tions the EL2180CEL2280CEL2480C have dG
and dP specifications of 001% and 001 respec-
tively while driving 500
X at AV ea1
Output Drive Capability
In spite of its low 3 mA of supply current the
EL2180C is capable of providing a minimum of
g
80 mA of output current Similarly each am-
plifier of the EL2280C and the EL2480C is capa-
ble of providing a minimum of g50 mA These
output drive levels are unprecedented in amplifi-
ers running at these supply currents With a min-
imum g80 mA of output drive the EL2180C is
capable of driving 50
X loads to g4V making it
an excellent choice for driving isolation trans-
formers
in
telecommunications
applications
Similarly the g50 mA minimum output drive of
each EL2280C and EL2480C amplifier 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 EL2180C
EL2280CEL2480C from the cable and allow ex-
tensive capacitive drive However other applica-
tions may have high capacitive loads without a
back-termination resistor In these applications a
small series resistor (usually between 5
X and
50
X) 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 output In many cases it is also possible to
simply increase the value of the feedback resistor
(RF) to reduce the peaking
Current Limiting
The EL2180CEL2280CEL2480C have no inter-
nal current-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 destruc-
tion of the device
Power Dissipation
With the high output drive capability of the
EL2180CEL2280CEL2480C
it is possible to
exceed the 150 C Absolute Maximum junction
temperature under certain very high load current
conditions Generally speaking when RL falls be-
low about 25
X it is important to calculate the
maximum junction temperature (TJmax) for the
application to determine if power-supply volt-
ages load conditions or package type need to be
modified for the EL2180CEL2280CEL2480C to
remain in the safe operating area These parame-
ters 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL2180CN | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2180CS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2180CS-T13 | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2180CS-T7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2180CW-T13 | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:250MHz / 3mA Current Mode Feedback Amplifiers |
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