EL5397ACS INTERSIL [Intersil Corporation], EL5397ACS Datasheet - Page 13

• Manufacturer Part Number: EL5397ACS
• Description: Triple 200MHz Fixed Gain Amplifier with Enable
• Manufacturer: INTERSIL [Intersil Corporation]

an AC-coupled, gain of +2, +5V single supply circuit
configuration.
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same
frequency response as DC levels are changed at the output.
This is especially difficult when driving a standard video load
of 150 , because of the change in output current with DC
level. Previously, good differential 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 4mA
supply current of each EL5397A amplifier. Special circuitry
has been incorporated in the EL5397A to reduce the
variation of output impedance with current output. This
results in dG and dP specifications of 0.03% and 0.04°, while
driving 150 at a gain of 2.
Video performance has also been measured with a 500
load at a gain of +1. Under these conditions, the EL5397A
has dG and dP specifications of 0.03% and 0.04°,
respectively.
Output Drive Capability
In spite of its low 4mA of supply current, the EL5397A is
capable of providing a minimum of ±95mA of output current.
With a minimum of ±95mA of output drive.
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 EL5397A from the cable and allow extensive
capacitive drive. However, other applications may have high
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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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0.1µF
V
IN
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
0.1µF
400
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
For information regarding Intersil Corporation and its products, see www.intersil.com
1k
1k
FIGURE 4.
+5
13
+
-
+5
400
V
OUT
EL5397A
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.
Current Limiting
The EL5397A 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 EL5397A, 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 EL5397A to remain in the safe operating
area. These parameters are calculated as follows:
where:
PD
where:
PD
JMAX
T
n = Number of amplifiers in the package
PD
the package
V
I
V
R
SMAX
MAX
JA
MAX
S
OUTMAX
L
MAX
MAX
= Load resistance
= Supply voltage
= Thermal resistance of the package
) for the application to determine if power supply
for each amplifier can be calculated as follows:
= Maximum ambient temperature
=
= Maximum supply current
= Maximum power dissipation of each amplifier in
2
T
= Maximum output voltage (required)
JMAX
V
S
=
I
SMAX
T
MAX
L
+
+
falls below about 25 , it is
V
JA
S
- V
n
OUTMAX
PD
MAX
V
--------------------------- -
OUTMAX
R
L