EL2270 View Datasheet(PDF) - Intersil
Part Name
Description
Manufacturer
EL2270 Datasheet PDF : 14 Pages
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EL2170, EL2270, EL2470
Driving Cables and Capacitive Loads
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, the back-termination series resistor will
decouple the EL2170, EL2270, and EL2470 from the cable
and allow extensive capacitive drive. However, other
applications may have high capacitive loads without a back-
termination resistor. In these applications, a small series
resistor (usually between 5Ω and 50Ω) 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 EL2170, EL2270, and EL2470 have no internal 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 destruction of
the device.
Power Dissipation
With the high output drive capability of the EL2170, EL2270,
and EL2470, 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 25Ω, it is important to calculate the maximum junction
Typical Application Circuits
temperature (TJMAX) for the application to determine if
power-supply voltages, load conditions, or package type
need to be modified for the EL2170, EL2270, and EL2470 to
remain in the safe operating area. These parameters are
calculated as follows [1]:
TJMAX = TMAX + (ΘJA × n × PDMAX)
where:
TMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
n = Number of amplifiers in the package
PDMAX = Maximum power dissipation of each amplifier in
the package
PDMAX for each amplifier can be calculated as follows [2]:
PDMAX
=
(2
× VS × ISMAX ) + (VS
-
VO
U
T
M
A
X
)
×
V-----O----U----T----M-----A----X--
RL
where:
VS = Supply voltage
ISMAX = Maximum supply current of 1 amplifier
VOUTMAX = Maximum output voltage of the application
RL = Load resistance
INVERTING 200mA OUTPUT CURRENT
DISTRIBUTION AMPLIFIER
11
FAST-SETTLING PRECISION AMPLIFIER
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