_______________Detailed Description

The MAX4178/MAX4278 are ±5V, wide-bandwidth,

fast-settling, closed-loop buffers featuring high slew

rate, high precision, high output current, low noise, and

low differential gain and phase errors. The MAX4178,

with a -3dB bandwidth of 330MHz, is preset for unity volt-

age gain (0dB). The MAX4278 is preset for a voltage gain

of +2 (6dB) and has a 310MHz -3dB bandwidth.

These devices have a unique input stage that com-

bines the benefits of a current-mode-feedback topolo-

gy (high slew rate and low power) with those of a

traditional voltage-feedback topology. This combination

of architectures results in low input offset voltage and

bias current, and high gain precision and power-supply

rejection.

Under short-circuit conditions, the output current is typ-

ically limited to 150mA. This is low enough that a short

to ground of any duration will not cause permanent

damage to the chip. However, a short to either supply

will create double the allowable power dissipation and

may cause permanent damage if allowed to exist for

longer than approximately 10 seconds. The high out-

put-current capability is an advantage in systems that

transmit a signal to several loads. See

High-

Performance Video Distribution Amplifier in the

Applications Information section.

330MHz, Gain of +1/Gain of +2

Closed-Loop Buffers

_______________________________________________________________________________________

7

-50

OUTPUT VOLTAGE SWING

vs. TEMPERATURE

TEMPERATURE (˚C)

3.0

2.5

3.5

4.0

-25

0

25

50

75

125

100

-50

INPUT VOLTAGE RANGE

vs. TEMPERATURE

TEMPERATURE (˚C)

2.0

3.5

3.0

2.5

1.5

1.0

4.0

4.5

MAX4178

MAX4278

-25

0

25

50

75

125

100

____________________________Typical Operating Characteristics (continued)

_____________________Pin Description

1

5

2

3

4

—

Output

6

Positive Power Supply.

Connect to +5V.

7

Negative Power Supply.

Connect to -5V.

4

Input

3

Ground

2

No Connection

1, 5, 8

PIN

OUT

IN

GND

N.C.

NAME

SOT23

SO/µMAX/DIP

FUNCTION