el5292 Intersil Corporation, el5292 Datasheet - Page 14

• Manufacturer Part Number: el5292
• Description: Dual 600mhz Current Feedback Amplifier With Enable
• Manufacturer: Intersil Corporation

capable of driving 50Ω 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 5Ω and
50Ω) 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
F
) to reduce the peaking.
L
14
falls below about 25Ω, it is
G
) can then be chosen to
EL5292, EL5292A
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 in Equation 1:
where:
PD
where:
T
PD
JMAX
JMAX
T
θ
n = Number of amplifiers in the package
PD
the package
V
I
V
R
SMAX
MAX
JA
MAX
MAX
S
OUTMAX
L
MAX
= Load resistance
= Supply voltage
= Thermal resistance of the package
) for the application to determine if power supply
=
for each amplifier can be calculated in Equation 2:
= Maximum ambient temperature
=
= Maximum supply current of 1A
T
= Maximum power dissipation of each amplifier in
2 (
MAX
= Maximum output voltage (required)
×
V
+
S
(
×
θ
JA
I
SMAX
×
n
×
)
PD
+
(
MAX
V
S
)
- V
OUTMAX
)
×
V
--------------------------- -
OUTMAX
June 28, 2007
R
L
FN7192.1
(EQ. 1)
(EQ. 2)