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Applications Information

Product Description

The EL5293 is a current-feedback operational amplifier that

offers a wide -3dB bandwidth of 300MHz and a low supply

current of 4mA per amplifier. The EL5293 works with supply

voltages ranging from a single 5V to 10V and they are also

capable of swinging to within 1V of either supply on the

output. Because of their current-feedback topology, the

EL5293 does not have the normal gain-bandwidth product

associated with voltage-feedback operational amplifiers.

Instead, its -3dB bandwidth to remain relatively constant as

closed-loop gain is increased. This combination of high

bandwidth and low power, together with aggressive pricing

make the EL5293 the ideal choice for many low-power/high-

bandwidth applications such as portable, handheld, or

battery-powered equipment.

For varying bandwidth needs, consider the EL5191 with

1GHz on a 9mA supply current or the EL5192 with 600MHz

on a 6mA supply current. Versions include single, dual, and

triple amp packages with 5-pin SOT23, 16-pin QSOP, and 8-

pin or 16-pin SO outlines.

Power Supply Bypassing and Printed Circuit

Board Layout

As with any high frequency device, good printed circuit board

layout is necessary for optimum performance. Low

impedance ground plane construction is essential. Surface

mount components are recommended, but if leaded

components are used, lead lengths should be as short as

possible. The power supply pins must be well bypassed to

reduce the risk of oscillation. The combination of a 4.7µF

tantalum capacitor in parallel with a 0.01µF capacitor has

been shown to work well when placed at each supply pin.

Pin Descriptions

8-PIN SO &

MSOP

10-PIN

MSOP

PIN NAME

FUNCTION

EQUIVALENT CIRCUIT

1

9

OUTA

Output, channel A

Circuit 1

2

10

INA-

Inverting input, channel A

Circuit 2

3

1

INA+

Non-inverting input, channel A

(see circuit 2)

2CEA

Chip enable, channel A

Circuit 3

4

3

VS-

Negative supply

4CEB

Chip enable, channel B

(see circuit 3)

5

5

INB+

Non-inverting input, channel B

(see circuit 2)

6

6

INB-

Inverting input, channel B

(see circuit 2)

7

7

OUTB

Output, channel B

(see circuit 1)

8

8

VS+

Positive supply

OUT

IN-

IN+

CE

EL5293, EL5293A