el5292a Intersil Corporation, el5292a Datasheet - Page 14

• Manufacturer Part Number: el5292a
• Description: Dual 600mhz Current Feedback Amplifier With Enable
• Manufacturer: Intersil Corporation

capable of driving 50 loads to both rails, making it an
excellent choice for driving isolation transformers in
telecommunications applications.
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 EL5292 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 5 and
50 ) can be placed in series with the output to eliminate
most peaking. The gain resistor (R
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 (R
Current Limiting
The EL5292 has no internal current-limiting circuitry. If the
output is shorted, it is possible to exceed the Absolute
Maximum Rating for output current or power dissipation,
potentially resulting in the destruction of the device.
Power Dissipation
With the high output drive capability of the EL5292, it is
possible to exceed the 125°C Absolute Maximum junction
temperature under certain very high load current conditions.
Generally speaking when R
important to calculate the maximum junction temperature
(T
voltages, load conditions, or package type need to be
modified for the EL5292 to remain in the safe operating area.
These parameters are calculated as follows:
where:
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notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
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JMAX
T
n = Number of amplifiers in the package
PD
the package
JA
MAX
MAX
= Thermal resistance of the package
) for the application to determine if power supply
= Maximum ambient temperature
F
= Maximum power dissipation of each amplifier in
) to reduce the peaking.
T
JMAX
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Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
=
T
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MAX
L
+
14
falls below about 25 , it is
JA
G
) can then be chosen to
n
PD
MAX
EL5292, EL5292A
PD
where:
PD
V
I
V
R
SMAX
MAX
MAX
S
OUTMAX
L
= Load resistance
= Supply voltage
for each amplifier can be calculated as follows:
=
= Maximum supply current of 1A
2
= Maximum output voltage (required)
V
S
I
SMAX
+
V
S
- V
OUTMAX
V
--------------------------- -
OUTMAX
R
L