EL2160CM-T13 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL2160CM-T13

180MHz Current Feedback Amplifier

Elantec -> Intersil 

EL2160C

180MHz Current Feedback Amplifier

over the entire die junction temperature range of 0°C < T

< 150°C.

Supply Voltage Range

The EL2160C has been designed to operate with supply

voltages from ±2V to ±15V. Optimum bandwidth, slew

rate, and video characteristics are obtained at higher sup-

ply voltages. However, at ±2V supplies, the 3dB

bandwidth at AV = +2 is a respectable 70MHz. The fol-

lowing figure is an oscilloscope plot of the EL2160C at

±2V supplies, AV = +2, RF = RG = 560Ω, driving a load

of 150Ω, showing a clean ±600mV signal at the output.

If a single supply is desired, values from +4V 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 characteristics to

0.1%, typically in the 35ns to 40ns 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, there-

fore any size step up to ±10V gives approximately the

same settling time.

As can be seen from the Long Term Settling Error curve,

for AV = +1, there is approximately a 0.035% residual

which tails away to 0.01% in about 40µs. This is a ther-

mal settling error caused by a power dissipation

differential (before and after the voltage step). For AV =

-1, due to the inverting mode configuration, this tail does

not appear since the input stage does not experience the

large voltage change as in the non-inverting mode. With

AV = -1, 0.01% settling time is slightly greater than

100ns.

Power Dissipation

The EL2160C amplifier combines both high speed and

large output current drive capability at a moderate sup-

ply current in very small packages. It is possible to

exceed the maximum junction temperature allowed

under certain supply voltage, temperature, and loading

conditions. To ensure that the EL2160C remains within

its absolute maximum ratings, the following 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

=

T----J---M-----A----X-----–----T----A----M-----A-----X-

θJA

The maximum power dissipation actually produced by

an IC is the total quiescent supply current times the total

power supply voltage plus the power in the IC due to the

load, or:

PDMAX = 2 × VS + (V S – VOUT ) × V-----RO----LU-----T-

where IS is the supply current. (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 degrades at

higher operating temperature and lower supply current.

Unlike some amplifiers, the EL2160C maintains almost

constant supply current over temperature so that AC per-

formance is not degraded as much over the entire

operating temperature range. Of course, this increase in

performance doesn't come for free. Since the current has

increased, supply voltages must be limited so that maxi-

mum power ratings are not exceeded.

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