1

LT1675/LT1675-1

250MHz, Triple and Single

RGB Multiplexer with Current Feedback Amplifiers

RED 1

GREEN 1

BLUE 1

RED 2

GREEN 2

BLUE 2

75

Ω

75

Ω

75

Ω

75

Ω

CABLE

CABLE

CABLE

SELECT RGB1/RGB2

1675 TA01

ENABLE

75

Ω

75

Ω

75

Ω

75

Ω

75

Ω

75

Ω

75

Ω

LT1675

75

Ω

+1

+1

+2

+2

+2

+1

+1

+1

+1

High Speed RGB MUX

FEATURES

s

RGB Switching

s

Workstation Graphics

s

Pixel Switching

s

Coaxial Cable Drivers

s

High Speed Signal Processing

The LT

pixel switching and fast workstation graphics.

Included on chip are three SPDT switches and three

current feedback amplifiers. The current feedback ampli-

fiers drive double-terminated 50

Ω or 75Ω cables and are

s

100MHz Pixel Switching

s

– 3dB Bandwidth: 250MHz

s

Small 16-Pin SSOP Package

s

Channel Switching Time: 2.5ns

s

Expandable to Larger Arrays

s

Drives Cables Directly

s

High Slew Rate: 1100V/

µs

s

Low Switching Transient: 50mV

s

Shutdown Supply Current: 0mA

s

Output Short-Circuit Protected

configured for a fixed gain of 2, eliminating six external

gain setting resistors. The SPDT switches are designed to

be break-before-make to minimize unwanted signals cou-

pling to the input.

The LT1675-1 is a single version with two inputs, a single

output and is ideal for a single channel application such as

video sync.

The key to the LT1675 fast switching speed is Linear

Technology’s proprietary high speed bipolar process. This

MUX can toggle between sources in excess of 100MHz,

has a slew rate over 1000V/

µs and has a –3dB bandwidth

of 250MHz. The speed and ease of use of the LT1675 make

it ideal for high performance PCs, workstations and pro-

fessional video monitors. The input-referred switching

virtually undetectable. Power supply requirements are

±4V to ±6V and power dissipation is only 300mW on±5V,

or 100mW for the LT1675-1. The expandable feature uses

the disable pin to reduce the power dissipation to near

0mW in the off parts.

Unlike competitive solutions that are in bulky high pin

count packages, the LT1675 is in a 16-lead narrow body

SSOP. This small footprint, the size of an SO-8, results in

a very clean high performance solution. The LT1675-1 is

available in the tiny MSOP and the SO-8.

MEASURED BETWEEN 50

Ω BACK TERMINATION AND 50Ω LOAD

500mV/DIV

1V/DIV

1675 TA02

0V

RED

OUT

1V

0V

SELECT

LOGIC

PIN 10

3V

Select Pin Switches Inputs at 100MHz

, LTC and LT are registered trademarks of Linear Technology Corporation.