EL2003C datasheet(8/17 Pages) ELANTEC

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EL2003C, EL2033C

100MHz Video Line Driver

The thermal resistance junction to case is 50°C/W for

the plastic DIP. A suitable heat sink will increase the

power dissipation capability significantly beyond that of

the package alone. Several companies make standard

heat sinks for both packages. Aavid and Thermalloy heat

sinks have been used successfully.

Parallel Operation

If more than 100mA output is required or if heat man-

agement is a problem, several EL2003C or EL2033Cs

may be paralleled together. The result is as though each

device was driving only part of the load. For example, if

two units are paralleled then a 50

Ω load looks like 100Ω

to each EL2003C. Parallel operation results in lower

input and output impedances, increased bias current but

no increase in offset voltage. An example showing three

EL2003Cs in parallel and also the addition of a FET

input buffer stage is shown below. By using a dual FET

the circuit complexity is minimal and the performance is

excellent. Take care to minimize the stray capacitance at

the input of the EL2003Cs for maximum slew rate and

bandwidth.

Resistive Loads

The DC gain of the EL2003C and EL2033C is the prod-

uct of the unloaded gain (0.995) and the voltage divider

formed by the device output resistance and the load

resistance.

The high frequency response of the EL2003C and

EL2033C varies with the value of the load resistance as

shown in the characteristic curves. If the 100MHz peak-

ing is undesirable when driving load resistors greater

than 50

Ω, an RC snubber circuit can be used from the

output to ground. The snubber circuit works by present-

ing a high frequency load resistance of less than 50

Ω

while having no loading effect at low frequencies.

FET Input Buffer with High Output Currents

Parallel Operation

IOUT ≥ ±300 mA

ROUT 2Ω

BW 100MHz

SR = 1000V/µs

J1, J2 2N5911 Dual FET

R1, R2 Offset Adjust

0.995

RL ROUT

------------------------------

Small Signal Response

RL = 50Ω, CL = 10pF, VS = ±15V

Top is VIN, Bottom is VOUT

Large Signal Response

RL = 100Ω, CL = 10pF, VS = ±15V

Top is VIN, Bottom is VOUT

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