5962-0721201QHC
Feedback Resistor Values
The 5962-0721201QXC has been designed and specified
with R
F
= 500Ω for A
V
= +2. This value of feedback resistor
yields extremely flat frequency response with little to no
peaking out to 200MHz. As is the case with all current
feedback amplifiers, wider bandwidth, at the expense of
slight peaking, can be obtained by reducing the value of the
feedback resistor. Inversely, larger values of feedback
resistor will cause rolloff to occur at a lower frequency. See
the curves in the Typical Performance Curves section which
show 3dB bandwidth and peaking vs. frequency for various
feedback resistors and various supply voltages.
Single Supply Operation
If a single supply is desired, values from +5V to +12V can be
used as long as the input common mode range is not
exceeded. When using a single supply, be sure to either 1)
DC bias the inputs at an appropriate common mode voltage
and AC couple the signal, or 2) ensure the driving signal is
within the common mode range of the 5962-0721201QXC.
Driving Cables and Capacitive Loads
The 5962-0721201QXC was designed with driving multiple
coaxial cables in mind. With 450mA of output drive and low
output impedance, driving six, 75Ω double terminated
coaxial cables to ±11V with one 5962-0721201QXC is
practical.
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 5962-0721201QXC from the capacitive cable
and allow extensive capacitive drive.
Other applications may have high capacitive loads without
termination resistors. In these applications, an additional
small value (5Ω to 50Ω) resistor in series with the output will
eliminate most peaking.
The schematic below shows the EL8108 driving 6 double
terminated cables, each of average length of 50 feet.
+5V
Bandwidth vs Temperature
Whereas many amplifier's supply current and consequently
3dB bandwidth drop off at high temperature, the 5962-
0721201QXC was designed to have little supply current
variations with temperature. An immediate benefit from this
is that the 3dB bandwidth does not drop off drastically with
temperature.
Supply Voltage Range
The 5962-0721201QXC has been designed to operate with
supply voltages from ±2.5V to ±6V. Optimum bandwidth,
slew rate, and video characteristics are obtained at higher
supply voltages. However, at ±2.5V supplies, the 3dB
bandwidth at A
V
= +5 is a respectable 200MHz.
-5V
750
750
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
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
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
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9
FN6558.1
November 1, 2007
INTERSIL [ INTERSIL CORPORATION ]
