EL2360CS datasheet(13/16 Pages) ELANTEC

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EL2360C

Triple 130 MHz Current Feedback Amplifier

Applications Information

Contd

If we set the two PDMAX equations 1 and 2

equal to each other and solve for VS we can get a

family of curves for various loads and output

voltages according to 3

VS e

RL (TJMAX b TAMAX)

iJA

(VOUT)2

(IS RL) a VOUT

The figures below show total supply voltage VS

vs RL for various output voltage swings for the

PDIP and SOIC packages The curves assume

WORST CASE conditions of TA ea85 C and

IS e 113 mA per amplifier The curves do not

include heat removal or forcing air or the simple

fact that the package will be attached to a circuit

board which can also provide some form of heat

removal Larger temperature and voltage ranges

are possible with heat removal and forcing air

past the part

Supply Voltage vs RL

for Various VOUT (PDIP Package)

2360 – 12

Supply Voltage vs RL

for Various VOUT (SOIC Package)

2360 – 13

Current Limit

The EL2360C has internal current limits that

protect the circuit in the event of an output being

shorted to ground This limit is set at 100 mA

nominally and reduces with the junction temper-

ature At TJ e 150 C the current limits at about

65 mA If any one output is shorted to ground

the power dissipation could be well over 1W and

much greater if all outputs are shorted Heat re-

moval is required in order for the EL2360C to

survive an indefinite short

Driving Cables and Capacitive Loads

When used as a cable driver double termination

is always recommended for reflection-free per-

formance For those applications the back-termi-

nation series resistor will de-couple the EL2360C

from the cable and allow extensive capacitive

drive

However

other applications may have

high capacitive loads without a back-termination

resistor In these applications a small series resis-

tor (usually between 5

X and 50X) can be placed

in series with the output to eliminate most peak-

ing The gain resistor (RG) can then be chosen to

make up for any gain loss which may be created

by this additional resistor at the output In many

cases it is also possible to simply increase the val-

ue of the feedback resistor (RF) to reduce the

peaking

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