FUNCTION

_____________________________________________________________Pin Descriptions

_______________Detailed Description

The MAX4112/MAX4117/MAX4119 are optimized for

MAX4113/MAX4118/MAX4120 are optimized for

closed-loop gains of 8V/V or greater. These low-power,

high-speed, current feedback amplifiers operate from

±5V supplies. They are designed to drive video loads

with low distortion characteristics. The MAX4112/

MAX4117/MAX4119’s differential gain and phase are

0.02% and 0.03°, respectively; the MAX4113/

MAX4118/MAX4120 exhibit gain/phase error specifica-

tions of 0.02% and 0.04°, respectively. These charac-

teristics, plus a wide 0.1dB gain flatness, make the

MAX4112/MAX4113/MAX4117–MAX4120 ideal for use

in broadcast and graphics video systems. The combi-

nation of ultra-high speed and low power makes these

parts suitable for use in general-purpose, high-speed

applications, such as medical imaging, industrial instru-

mentation, and communications systems.

__________Applications Information

Theory of Operation

Since these devices are current-feedback amplifiers,

their open-loop transfer function is expressed as a

transimpedance,

behavior of the open-loop transimpedance is similar to

the open-loop gain of a voltage feedback amplifier.

That is, it has a large DC value and decreases at

approximately 6dB per octave.

Analyzing the follower with gain, as shown in Figure 1,

yields the following transfer function:

≅ 30Ω.

V

V

G x

Z

Z

G x R

R

OUT

IN

OL S

OL S

IN

F

=

+

+

(

)

( )

( )

Single/Dual/Quad, 400MHz, Low-Power,

Current Feedback Amplifiers

_______________________________________________________________________________________

9

+1

+1

MAX4112

MAX4113

MAX4117

MAX4118

MAX4119

MAX4120

Figure 1. Current Feedback Amplifier

PIN

NAME

FUNCTION

MAX4112

MAX4113

SO/µMAX

MAX4117

MAX4118

SO

1, 5, 8

—

N.C.

No Connection. Not internally

connected.

—

1

OUTA

Amplifier A Output

2

—

IN-

Inverting Input

—

2

INA-

Amplifier A Inverting Input

3

—

IN+

Noninverting Input

—

3

INA+

Amplifier A Noninverting Input

4

4

Negative Power Supply.

Connect to -5V.

—

5

INB+

Amplifier B Noninverting Input

6

—

OUT

Amplifier Output

—

6

INB-

Amplifier B Inverting Input

—

7

OUTB

Amplifier B Output

7

8

Positive Power Supply.

Connect to +5V.

PIN

NAME

FUNCTION

1

1

OUTA

Amplifier A Output

2

2

INA-

Amplifier A Inverting Input

3

3

INA+

Amplifier A Noninverting Input

4

4

Positive Power Supply.

Connect to +5V.

5

5

INB+

Amplifier B Noninverting Input

6

6

INB-

Amplifier B Inverting Input

7

7

OUTB

Amplifier B Output

—

8, 9

N.C.

No Connection. Not internally

connected.

8

10

OUTC

Amplifier C Output

9

11

INC-

Amplifier C Inverting Input

10

12

INC+

Amplifier C Noninverting Input

11

13

Negative Power Supply.

Connect to -5V.

12

14

IND+

Amplifier D Noninverting Input

13

15

IND-

Amplifier D Inverting Input

14

16

OUTD

Amplifier D Output

SO

QSOP

MAX4119/MAX4120