V

+

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7

IN 3

+

-

1

IN 0

5

IN 2

3

IN 1

10

8

12

13

11

9

14

6

V

-

A0

A1

EN

2, 4

LMH6574

www.ti.com

SNCS103D – NOVEMBER 2004 – REVISED DECEMBER 2014

7 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

7.1 Application Information

The LMH6574 is a high-speed 4:1 analog multiplexer, optimized for very high speed and low distortion. With

selectable gain and excellent AC performance, the LMH6574 is ideally suited for switching high resolution,

presentation grade video signals. The LMH6574 has no internal ground reference. Single or split supply

configurations are both possible. The LMH6574 features very high speed channel switching and disable times.

When disabled the LMH6574 output is high impedance making MUX expansion possible by combining multiple

devices. See Multiplexer Expansion.

7.2 Typical Application

Figure 27. Typical Application

7.2.1 Video Performance

The LMH6574 has been designed to provide excellent performance with production quality video signals in a

wide variety of formats such as HDTV and High Resolution VGA. Best performance will be obtained with back-

terminated loads. The back termination reduces reflections from the transmission line and effectively masks

transmission line and other parasitic capacitances from the amplifier output stage. Figure 27 shows a typical

configuration for driving a 75

Ω. Cable. The output buffer is configured for a gain of 2, so using back terminated

loads will give a net gain of 1.

Copyright © 2004–2014, Texas Instruments Incorporated

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