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LT1675CS8-1

250MHz, Triple and Single RGB Multiplexer with Amplifiers

Linear Technology 

LT1675/LT1675-1

250MHz, Triple and Single

RGB Multiplexer with Amplifiers

FEATURES

■ 100MHz Pixel Switching

■ – 3dB Bandwidth: 250MHz

■ Channel Switching Time: 2.5ns

■ Expandable to Larger Arrays

■ Drives Cables Directly

■ High Slew Rate: 1100V/µs

■ Low Switching Transient: 50mV

■ Shutdown Supply Current: 100µA

■ Output Short-Circuit Protected

■ Available in Small 16-Pin SSOP Package

U

APPLICATIO S

■ RGB Switching

■ Workstation Graphics

■ Pixel Switching

■ Coaxial Cable Drivers

■ High Speed Signal Processing

DESCRIPTIO

The LT®1675 is a high speed RGB multiplexer designed

for 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 50Ω or 75Ω cables and are

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. 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.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

High Speed RGB MUX

RED 1

+1

75Ω

GREEN 1

+1

75Ω

BLUE 1

+1

75Ω

RED 2

+1

75Ω

GREEN 2

+1

75Ω

BLUE 2

+1

75Ω

LT1675

V+

75Ω CABLE

+2

VOUT RED

75Ω

75Ω CABLE

+2

VOUT GREEN

75Ω

75Ω CABLE

+2

VOUT BLUE

75Ω

V–

SELECT RGB1/RGB2

ENABLE

1675 TA01

Clocking Between 2 DC Levels at 100MHz

3V

LOGIC

INPUT

PIN 10

0V

1V

RED

OUT

0V

1V/DIV

500mV/DIV

RED INPUT 1 = 0VDC, RED INPUT 2 = 1VDC

MEASURED BETWEEN 50Ω BACK TERMINATION AND 50Ω LOAD

1675 TA02

16751fb

1

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