el2344 Intersil Corporation, el2344 Datasheet - Page 10

• Manufacturer Part Number: el2344
• Description: Triple Low-power 60mhz Unity-gain Stable Op Amp
• Manufacturer: Intersil Corporation

Output Drive Capability
The EL2344 has been designed to drive low impedance
loads. It can easily drive 6V
output drive capability makes the EL2344 an ideal choice for
RF, IF and video applications. Furthermore, the current drive
of the EL2344 remains a minimum of 35mA at low
temperatures. The EL2344 is current-limited at the output,
allowing it to withstand shorts to ground. However, power
dissipation with the output shorted can be in excess of the
power-dissipation capabilities of the package.
Capacitive Loads
For ease of use, the EL2344 has been designed to drive any
capacitive load. However, the EL2344 remains stable by
automatically reducing its gain-bandwidth product as
capacitive load increases. Therefore, for maximum
bandwidth, capacitive loads should be reduced as much as
possible or isolated via a series output resistor (Rs).
Similarly, coax lines can be driven, but best AC performance
is obtained when they are terminated with their characteristic
impedance so that the capacitance of the coaxial cable will
not add to the capacitive load seen by the amplifier. Although
stable with all capacitive loads, some peaking still occurs as
load capacitance increases. Series resistors at the output of
the EL2344 can be used to reduce this peaking and further
improve stability.
Printed-Circuit Layout
The EL2344 is well behaved, and easy to apply in most
applications. However, a few simple techniques will help
assure rapid, high quality results. As with any high-frequency
device, good PCB layout is necessary for optimum
performance.
Ground-plane construction is highly recommended, as is
good power supply bypassing. A 0.1µF ceramic capacitor is
recommended for bypassing both supplies. Pin lengths
should be as short as possible, and bypass capacitors
should be as close to the device pins as possible. For good
AC performance, parasitic capacitances should be kept to a
minimum at both inputs and at the output. Resistor values
should be kept under 5k: because of the RC time constants
associated with the parasitic capacitance. Metal-film and
carbon resistors are both acceptable, use of wire-wound
resistors is not recommended because of their parasitic
inductance. Similarly, capacitors should be low-inductance
for best performance.
PP
10
into a 150: load. This high
EL2344
The EL2344 Macromodel
This macromodel has been developed to assist the user in
simulating the EL2344 with surrounding circuitry. It has been
developed for the PSPICE simulator (copywritten by the
Microsim Corporation), and may need to be rearranged for
other simulators. It approximates DC, AC, and transient
response for resistive loads, but does not accurately model
capacitive loading. This model is slightly more complicated
than the models used for low-frequency op-amps, but it is
much more accurate for AC analysis.
The model does not simulate these characteristics
accurately:
noise
settling-time
CMRR
PSRR
non-linearities
temperature effects
manufacturing variations
TABLE 2.