Datasheet

V
+
SD
R
F
+
-
1
R
IN0
IN 0
4
IN 1
R
IN1
2
8
7
3
6
5
V
-
R
T
SEL
V
OUT
R
OUT
R
G
R
T
LMH6570
SNCS104C –APRIL 2005–REVISED MAY 2013 www.ti.com
APPLICATION NOTES
GENERAL INFORMATION
Figure 26. Typical Application
The LMH6570 is a high-speed 2:1 analog multiplexer, optimized for very high speed and low distortion. With
selectable gain and excellent AC performance, the LMH6570 is ideally suited for switching high resolution,
presentation grade video signals. The LMH6570 has no internal ground reference. Single or split supply
configurations are both possible, however, all logic functions are referenced to the mid supply point. The
LMH6570 features very high speed channel switching and disable times. When disabled the LMH6570 output is
high impedance making MUX expansion possible by combining multiple devices. See MULTIPLEXER
EXPANSION. The LMH6570 SEL defaults to logic low (IN0 active). The default state for the SD pin is also logic
low (device enabled). Both pins can be left floating if the default state is desired.
VIDEO PERFORMANCE
The LMH6570 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 26 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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