EL2280CS-T13 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL2280CS-T13

250MHz / 3mA Current Mode Feedback Amplifiers

Elantec -> Intersil 

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

output drive of each EL2280C and EL2480C amplifier

allows swings of ±2.5V into 50Ω loads.

Driving Cables and Capacitive Loads

When used as a cable driver, double termination is

always recommended for reflection-free performance.

For those applications, the back-termination series resis-

tor will decouple the EL2180C/EL2280C/EL2480C

from the cable and allow extensive capacitive drive.

However, other applications may have high capacitive

loads without a back-termination resistor. In these appli-

cations, a small series resistor (usually between 5Ω and

50Ω) can be placed in series with the output to eliminate

most peaking. 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 value of the feed-

back resistor (RF) to reduce the peaking.

Current Limiting

The EL2180C/EL2280C/EL2480C have no internal cur-

rent-limiting circuitry. If any output is shorted, it is

possible to exceed the Absolute Maximum Ratings for

output current or power dissipation, potentially resulting

in the destruction of the device.

Power Dissipation

With the high output drive capability of the

EL2180C/EL2280C/EL2480C, it is possible to exceed

the 150°C Absolute Maximum junction temperature

under certain very high load current conditions. Gener-

ally speaking, when RL falls below about 25Ω, it is

important to calculate the maximum junction tempera-

ture (TJMAX) for the application to determine if power-

supply voltages, load conditions, or package type need

to be modified for the EL2180C/EL2280C/EL2480C to

remain in the safe operating area. These parameters are

calculated as follows:

TJMAX = TMAX + (ΘJA × n × PDMAX)

where:

TMAX = Maximum Ambient Temperature

θJA = Thermal Resistance of the Package

n = Number of Amplifiers in the Package

PDMAX = Maximum Power Dissipation of Each

Amplifier in the Package

PDMAX for each amplifier can be calculated as follows:

PDMAX = (2 × VS × ISMAX ) + (VS – VOUTMAX ) × V-----O----U--R--T---L-M-----A----X--

where:

VS = Supply Voltage

ISMAX = Maximum Supply Current of 1 Amplifier

VOUTMAX = Maximum Output Voltage of the

Application

RL = Load Resistance

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