Datasheet

V
+
SD
7
R
F
IN 3
+
-
1
R
IN0
IN 0
5
IN 2
3
IN 1
R
IN3
R
IN2
R
IN1
10
8
12
13
11
9
14
6
V
-
R
T
A0
R
T
A1
V
OUT
R
OUT
R
G
R
T
EN
R
T
2, 4
LMH6574
www.ti.com SNCS103C –NOVEMBER 2004–REVISED SEPTEMBER 2005
APPLICATION NOTES
GENERAL INFORMATION
Figure 28. Typical Application
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 below.
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 28 shows a typical
configuration for driving a 75Ω. Cable. The output buffer is configured for a gain of 2, so using back terminated
loads will give a net gain of 1.
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