EL2244, EL2444

FN7059 Rev 2.00

Page 8 of 11

May 16, 2005

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

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:

where:

amplifier can be calculated as follows:

where:

application

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

allowable supply voltages for the example of the video cable-

shown in Table 1. If we assume (for this example) that we are

driving a back-terminated video cable, then the maximum

150

, giving the results seen in Table 1.

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 input

lower output voltage range is within 300mV of ground. Upper

ALL PACKAGES USE THE SAME SCHEMATIC

TABLE 1.

PART

PACKAGE

MAX PDISS

DUALS

EL2244CN

PDIP8

100°C/W

0.650W @85°C

±16.6V

EL2244CS

SO8

160°C/W

0.406W @85°C

±10.5V

QUADS

EL2444CN

PDIP14

81°C/W

0.802W @85°C

±11.5V

EL2444CS

SO14

120°C/W

0.542W @85°C

±7.5V

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