EL2073CN View Datasheet(PDF) - Elantec -> Intersil

Part Name

Description

Manufacturer

EL2073CN

200MHz Unity-Gain Stable Operational Amplifier

Elantec -> Intersil 

EL2073C

200MHz Unity-Gain Stable Operational Amplifier

the current drive of the EL2073C remains a minimum of

50mA at low temperatures. The EL2073C is current-

limited at the output, allowing it to withstand momen-

tary shorts to ground. However, power dissipation with

the output shorted can be in excess of the power-dissipa-

tion capabilities of the package.

Capacitive Loads

Although the EL2073C has been optimized to drive

resistive loads as low as 50Ω, capacitive loads will

decrease the amplifier's phase margin which may result

in peaking, overshoot, and possible oscillation. For opti-

mum AC performance, capacitive loads should be

reduced as much as possible or isolated via a series out-

put resistor. Coax lines can be driven, as long as they are

terminated with their characteristic impedance. When

properly terminated, the capacitance of coaxial cable

will not add to the capacitive load seen by the amplifier.

Capacitive loads greater than 10pF should be buffered

with a series resistor (Rs) to isolate the load capacitance

from the amplifier output. A curve of recommended Rs

vs Cload has been included for reference. Values of Rs

were chosen to maximize resulting bandwidth without

peaking.

Printed-Circuit Layout

As with any high-frequency device, good PCB layout is

necessary for optimum performance. Ground-plane con-

struction is highly recommended, as is good power

supply bypassing. A 1µF–10µF tantalum capacitor is

recommended in parallel with a 0.01µF ceramic capaci-

tor. All lead lengths should be as short as possible, and

all bypass capacitors should be as close to the device

pins as possible. Parasitic capacitances should be kept to

an absolute minimum at both inputs and at the output.

Resistor values should be kept under 1000Ω to 2000Ω

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 parasitic inductance. Simi-

larly, capacitors should be low-inductance for best

performance. If possible, solder the EL2073C directly to

the PC board without a socket. Even high quality sockets

add parasitic capacitance and inductance which can

potentially degrade performance. Because of the degra-

dation of AC performance due to parasitics, the use of

surface-mount components (resistors, capacitors, etc.) is

also recommended.

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