EL2157CS datasheet(16/20 Pages) ELANTEC

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EL2150CEL2157C

125 MHz Single Supply Clamping Op Amps

Applications Information

Contd

2150 – 66

Figure 8

Multiplexing with the EL2157C

The ENABLE pin on the EL2157C allows for

multiplexing applications Figure 9 shows two

EL2157Cs with their outputs tied together driv-

ing a back terminated 75

X video load A 2 Vp-p

10 MHz sinewave is applied at one input and a

1 Vp-p 5 MHz sinewave to the other Figure 10

shows the CLOCK signal which is applied and

the resulting output waveform at VOUT Switch-

ing is complete in about 50 ns Notice the outputs

are tied directly together Decoupling resistors at

each output are not necessary In fact adding

them approximately doubles the switching time

to 100 nsec

2150 – 67

Figure 9

2150 – 68

Figure 10

Short Circuit Current Limit

The EL2150CEL2157C have internal short cir-

cuit protection circuitry that protect it in the

event of its output being shorted to either supply

rail This limit is set to around 100 mA nominally

and reduces with increasing junction tempera-

ture It is intended to handle temporary shorts If

an output is shorted indefinitely the power dissi-

pation could easily increase such that the part

will be destroyed Maximum reliability is main-

tained if the output current never exceeds

90 mA A heat sink may be required to keep

the junction temperature below absolute maxi-

mum when an output is shorted indefinitely

Power Dissipation

With the high output drive capability of the

EL2150CEL2157C it is possible to exceed the

150 C Absolute Maximum junction temperature

under certain load current conditions Therefore

it is important to calculate the maximum junc-

tion temperature for the application to determine

if power-supply voltages

load conditions

package type need to be modified for the

EL2150CEL2157C to remain in the safe operat-

ing area

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