EL2244CSZ-T13 데이터 시트보기 (PDF) - Intersil

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EL2244CSZ-T13

Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp

Intersil 

EL2244, EL2444

Simplified Schematic (Per Amplifier)

Burn-In Circuit (Per Amplifier)

ALL PACKAGES USE THE SAME SCHEMATIC

Applications Information

Product Description

The EL2244 and EL2444 are low-power wideband

monolithic operational amplifiers built on Elantec's

proprietary high-speed complementary bipolar process. The

EL2244 and EL2444 use a classical voltage-feedback

topology which allows them to be used in a variety of

applications where current-feedback amplifiers are not

appropriate because of restrictions placed upon the

feedback element used with the amplifier. The conventional

topology of the EL2244 and EL2444 allows, for example, a

capacitor to be placed in the feedback path, making it an

excellent choice for applications such as active filters,

sample-and-holds, or integrators. Similarly, because of the

ability to use diodes in the feedback network, the EL2244

and EL2444 are an excellent choice for applications such as

fast log amplifiers.

Power Dissipation

With the wide power supply range and large output drive

capability of the EL2244 and EL2444, it is possible to exceed

the 150°C maximum junction temperatures under certain

load and power-supply conditions. It is therefore important to

calculate the maximum junction temperature (TJMAX) for all

applications to determine if power supply voltages, load

conditions, or package type need to be modified for the

EL2244 and EL2444 to remain in the safe operating area.

These parameters are related as follows:

TJMAX = TMAX + (ΘJA × PDMAXTOTAL)

where:

PDMAXTOTAL is the sum of the maximum power dissipation

of each amplifier in the package (PDMAX). PDMAX for each

amplifier can be calculated as follows:

PDMAX

=

2 × VS × ISMAX + (VS

-

VO

UT

MAX

)

×

V-----O----U----T----M-----A----X--

RL

where:

TMAX = Maximum ambient temperature

θJA = Thermal resistance of the package

PDMAX = Maximum power dissipation of each amplifier

VS = Supply voltage

ISMAX = Maximum supply current of each amplifier

VOUTMAX = Maximum output voltage swing of the

application

RL = Load resistance

To serve as a guide for the user, we can calculate maximum

allowable supply voltages for the example of the video

cable-driver below since we know that TJMAX = 150°C,

TMAX = 85°C, ISMAX = 7.6mA per amplifier, and the

package θJAs are shown in Table 1. If we assume (for this

example) that we are driving a back-terminated video cable,

then the maximum average value (over duty-cycle) of

VOUTMAX is 1.4V, and RL = 150Ω, giving the results seen in

Table 1.

PART

DUALS

EL2244CN

EL2244CS

QUADS

EL2444CN

TABLE 1.

PACKAGE ΘJA

MAX PDISS

@TMAX

MAX VS

PDIP8

SO8

100°C/W 0.650W @85°C ±16.6V

160°C/W 0.406W @85°C ±10.5V

PDIP14 81°C/W 0.802W @85°C ±11.5V

EL2444CS

SO14 120°C/W 0.542W @85°C ±7.5V

Single-Supply Operation

The EL2244 and EL2444 have been designed to have a

wide input and output voltage range. This design also makes

the EL2244 and EL2444 an excellent choice for single-

supply operation. Using a single positive supply, the lower

8

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