MAX497CSLASHD datasheet(8/12 Pages) MAXIM

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_______________Detailed Description

The MAX496/MAX497 are quad, high-speed, closed-loop

voltage-feedback video amplifiers with fixed gain settings

of +1 and +2, respectively (Figure 1). These amplifiers

use a unique two-stage voltage-feedback architecture

that combines the benefits of conventional voltage-feed-

back and current-mode-feedback topologies. They

achieve wide bandwidths and high slew rates while main-

taining precision. A resistively loaded first stage provides

low input-referred noise even with low supply currents of

8mA per amplifier. The above features, along with the

ability to drive 50

Ω or 75Ω back-terminated cables to

±2.8V and low differential phase and gain errors, make

these amplifiers ideal for the most demanding component

and composite video applications.

__________Applications Information

The feedback elements of the MAX496/MAX497 are

included internally in the device to set the closed-loop

gain to AV = +1 and AV = +2, respectively. Closing the

loop internally on the chip minimizes problems associ-

ated with the board and package parasitics influencing

the amplifier’s frequency response.

375MHz Quad Closed-Loop

Video Buffers, AV = +1 and +2

_______________________________________________________________________________________

_____________________Pin Description

Channel 2 Output

OUT2

Channel 3 Input

IN3

Positive Power Supply. Connect to +5V.

VCC pins are internally connected.

Connect both pins to +5V externally to

minimize the supply impedance.

VCC

9, 15

Channel 3 Output

OUT3

Negative power supply. Connect to -5V.

VEE pins are internally connected.

Connect both pins to -5V externally to

minimize the supply impedance.

VEE

11, 13

Channel 2 Input

IN2

Channel 0 Input

IN0

Ground. All ground pins are internally

connected. Connect all ground pins

externally to minimize the ground

impedance.

GND

1, 3,

5, 7

FUNCTION

NAME

OUT1

Channel 1 Output

OUT0

Channel 0 Output

Figure 1. Typical Operating Circuit

MAX496*

MAX497*

OUT0

RED

GREEN

BLUE

SYNC

GND

IN0

0.10

µF

0.10

µF

0.10

µF

+5V

-5V

VCC

VEE

*AV = +1 (MAX496)

*AV = +2 (MAX497)

AV = *

IN1

IN2

IN3

Ω

Ω CABLE

Ω

AV = *

OUT1

Ω

OUT2

Ω

OUT3

Ω

0.10

µF

Channel 1 Input

IN1

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