LT1675| Datasheet

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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/us Low Switching Transient: 50mV Shutdown Supply Current: 100uA Output Short-Circuit Protected Available in Small 16-Pin SSOP Package

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 coupling 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/us 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.

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 amplifiers drive double-terminated 50 or 75 cables and are

TYPICAL APPLICATIO
LT1675 RED 1 75 +2 GREEN 1 75 +1 +1

High Speed RGB MUX
V+ 75 CABLE VOUT RED 75 75 BLUE 1 75 RED 2 75 GREEN 2 75 SELECT RGB1/RGB2 BLUE 2 75 +1 ENABLE
1675 TA01

+1

+2

+1

+2

+1

U

U

U

Clocking Between 2 DC Levels at 100MHz
3V LOGIC INPUT PIN 10 0V 1V RED OUT 0V 1V/DIV

CABLE VOUT GREEN 75

500mV/DIV

75 CABLE VOUT BLUE 75 V

RED INPUT 1 = 0VDC, RED INPUT 2 = 1VDC MEASURED BETWEEN 50 BACK TERMINATION AND 50 LOAD
1675 TA02

16751fb

1

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LT1675 DATASHEET