EL2160CS datasheet(13/16 Pages) ELANTEC

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EL2160C

130 MHz Current Feedback Amplifier

Applications Information

Contd

Supply Voltage Range

The EL2160C has been designed to operate with

supply voltages from g2V to g15V Optimum

bandwidth slew rate and video characteristics

are obtained at higher supply voltages However

at g2V supplies the 3 dB bandwidth at AV e

2 is a respectable 70 MHz The following figure

is an oscilloscope plot of the EL2160C at g2V

supplies AV ea2 RF e RG e 560X driving a

load of 150

X showing a clean g600 mV signal at

the output

2060 – 11

If a single supply is desired values from a4V to

30V 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

EL2160C

Settling Characteristics

The EL2160C offers superb settling characteris-

tics to 01% 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 amplifiers The EL2160C

is not slew rate limited therefore any size step up

to g10V gives approximately the same settling

time

As can be seen from the Long Term Settling Er-

ror curve for AV ea1 there is approximately a

0035% residual which tails away to 001% in

about 40

ms This is a thermal settling error

caused by a power dissipation differential (before

and after the voltage step) For AV eb1 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 eb1 001% settling

time is slightly greater than 100 ns

Power Dissipation

The EL2160C amplifier combines both high

speed and large output current drive capability at

a moderate supply current in very small pack-

ages It is possible to exceed the maximum junc-

tion temperature allowed under certain supply

voltage temperature and loading conditions To

ensure that the EL2160C remains within its abso-

lute maximum ratings the following discussion

will help to avoid exceeding the maximum junc-

tion 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 2 VS IS a (VS b VOUT)

VOUT

where IS is the supply current (To be more accu-

rate 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

the

EL2160C

maintains

almost

constant

supply

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