_______________General Description

The MAX498/MAX499 are high-speed, quad/triple, sin-

gle-pole/double-throw video switches with on-board

closed-loop buffer amplifiers. The buffer amplifiers fea-

width, 70MHz 0.1dB gain flatness, and 1250V/

µs slew

rate. Fast switching time (3ns) and fast settling time

(12ns for a 4V step) make these devices excellent

choices for a wide variety of video applications. The low

differential gain/phase errors (0.03%/0.06°) and wide

bandwidth make them ideal for both composite-video

and RGB applications. The amplifiers are capable of

delivering ±2.5V into back-terminated 50

Ω or 75Ω

cables, and they deliver ±2V to a 75

Ω load, allowing

multiple cables to be driven from a single output.

For implementation of large switch arrays, a low-power

disable mode places the amplifier outputs in a high-

impedance state. Channel selection and output

enable/disable are controlled by four TTL/CMOS-

compatible logic inputs. Each video input is isolated by

an AC-ground pin, which minimizes channel-to-channel

capacitance and reduces crosstalk to 90dB at 10MHz.

The four-channel MAX498 dissipates 390mW (typical)

from ±5VDC power supplies with all output buffers

enabled. Power consumption is reduced to 130mW with

all buffers disabled. The corresponding dissipation for

the three-channel MAX499 is 300mW enabled and

100mW disabled.

________________________Applications

Video Switching and Routing

Broadcast-Quality Composite-Video Multiplexing

Workstations

Video Editing

Broadcast and High-Definition TV Systems

Multimedia Products

Medical Imaging

____________________________Features

o High Speed:

250MHz Small-Signal -3dB Bandwidth

135MHz Full-Power -3dB Bandwidth

o 70MHz 0.1dB Gain Flatness

o 1250V/µs Slew Rate

o 12ns to 0.1% Settling Time

o 0.03°/0.06% Differential Phase/Gain Error

o 2pF Input Capacitance

o 3ns Channel-Switching Time

o 120mVp-p Channel-Switching Transient

o Three-State Output Allows Large Switch Arrays

o Directly Drives 50

Ω or 75Ω Back-Terminated

Cables

Quad/Triple, SPDT, RGB Switches

with 250MHz Video Buffer Amplifiers

________________________________________________________________

Maxim Integrated Products

1

_________________Pin Configurations

19-1143; Rev 0; 10/96

PART

MAX498CWI

MAX499CWG

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

28 SO

24 SO

______________Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

GND

LE

EN

A0

GND

IN2A

GND

IN1A

TOP VIEW

CS

OUT1

IN1B

IN3A

16

15

14

13

9

10

11

12

OUT2

N.C.

OUT3

N.C.

IN3B

GND

IN2B

GND

SO

MAX499

MAX498 appears at end of data sheet.

EVALUATION

KIT

AVAILABLE