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EL2260C

Dual/Quad 130 MHz Current Feedback Amplifiers

Elantec -> Intersil 

EL2260C EL2460C

Dual Quad 130 MHz Current Feedback Amplifiers

Applications Information Contd

Supply Voltage Range

The EL2260C EL2460C has been designed to op-

erate with supply voltages from g2V to g15V

Optimum bandwidth slew rate and video char-

acteristics are obtained at higher supply voltages

However at g2V supplies the 3 dB bandwidth

at AV e a2 is a respectable 70 MHz The fol-

lowing figure is an oscilloscope plot of the

EL2260C at g2V supplies AV e a2 RF e RG

e 560X driving a load of 150X showing a clean

g600 mV signal at the output

2260 – 13

If a single supply is desired values from a4V to

a30V can be used as long as the input common

mode range is not exceeded When using a single

supply be sure to either 1) DC bias the inputs at

an appropriate common mode voltage and AC

couple the signal or 2) ensure the driving signal

is within the common mode range of the

EL2260C EL2460C

Settling Characteristics

The EL2260C EL2460C offer superb settling

characteristics to 0 1% typically in the 35 ns to

40 ns range There are no aberrations created

from the input stage which often cause longer

settling times in other current feedback amplifi-

ers The EL2260 EL2460 are not slew rate limit-

ed therefore any size step up to g10V gives ap-

proximately the same settling time

As can be seen from the Long Term Settling Er-

ror curve for AV e a1 there is approximately a

0 035% residual which tails away to 0 01% in

about 40 ms This is a thermal settling error

caused by a power dissipation differential (before

and after the voltage step) For AV e b1 due to

the inverting mode configuration this tail does

not appear since the input stage does not experi-

ence the large voltage change as in the non-

inverting mode With AV e b1 0 01% settling

time is slightly greater than 100 ns

Power Dissipation

The EL2260C EL2460C amplifiers combine both

high speed and large output current drive capa-

bility at a moderate supply current in very small

packages It is possible to exceed the maximum

junction temperature allowed under certain sup-

ply voltage temperature and loading conditions

To ensure that the EL2260C EL2460C remain

within their absolute maximum ratings the fol-

lowing discussion will help to avoid exceeding

the maximum junction temperature

The maximum power dissipation allowed in a

package is determined by its thermal resistance

and the amount of temperature rise according to

PDMAX

e

TJMAX b TAMAX

iJA

The maximum power dissipation actually pro-

duced by an IC is the total quiescent supply cur-

rent times the total power supply voltage plus

the power in the IC due to the load or

PDMAX e

 J N

2

VS

IS a (VS b VOUT)

VOUT

RL

where N is the number of amplifiers per package

and IS is the current per amplifier (To be more

accurate the quiescent supply current flowing in

the output driver transistor should be subtracted

from the first term because under loading and

due to the class AB nature of the output stage

the output driver current is now included in the

second term )

In general an amplifier’s AC performance de-

grades at higher operating temperature and lower

supply current Unlike some amplifiers such as

the LT1229 and LT1230 the EL2260C EL2460C

13

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