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PDF ( 数据手册 , 数据表 ) LM1044

零件编号 LM1044
描述 Analog Video Switch
制造商 National Semiconductor
LOGO National Semiconductor LOGO 


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LM1044 数据手册, 描述, 功能
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June 1992
LM1044 Analog Video Switch
General Description
Primarily intended for but not restricted to the switching of
video signals the LM1044 is a monolithic DC controlled an-
alog switch with buffered outputs allowing the selection of
three 5 MHz bandwidth 6 dB gain channels or two
RGBaSync 30 MHz bandwidth 0 dB gain channels Chan-
nel selection is achieved via latched TTL compatible logic
inputs which may be controlled by microprocessor derived
signals The device is supplied in a 24 pin dual in line plastic
package
Features
Y Wide RGB bandwidth typically 30 MHz
Y High signal to noise ratio typically 60 dB
Y Excellent channel isolation typically b60 dB 5 MHz
Y High RGB output currents typically 4 mA peak
Y RGB channels may be DC restored or clamped
Y Logically compatible with the LM1038 stereo audio
switch IC
Block Diagram
Order Number LM1044N
See NS Package Number N24A
TL H 9252 – 1
C1995 National Semiconductor Corporation TL H 9252
RRD-B30M115 Printed in U S A







LM1044 pdf, 数据表
Application Notes (Continued)
FIGURE 3 LM1044 Application Circuit Showing System Interfacing and LM1038
TL H 9252 – 5
OPERATION WITH SPLIT SUPPLIES
The LM1044 may be operated with split supplies with due
regard to the maximum supply voltage (16V) and output sig-
nal range An example of operation in this way is illustrated
below With g5V and pin 14 held at 0V the RGB outputs
can swing a2V b1 5V and the CV and Sync output can
swing a1 3V b1 3V Similarly with a10V b5V supplies
pin 14 to 0V RGB output swings of a5 5V b1 5V and CV
Sync swings of a4 5V and b1 5V can be obtained This
supply configuration has the advantage that pin 14 can be
grounded and all signals may be DC coupled avoiding the
need for coupling capacitors Offsets introduced are typical-
ly b30 mV for CV and RGB channels and b140 mV for
Sync channels
OTHER APPLICATIONS
The LM1044 can be used in other than the standard CV with
RGB circuit and an example is given below of a dual 6 input
to 1 output multiplexer for video or indeed any kind of sig-
nals up to 2 Vp-p In this particular example the RGB outputs
are cross-coupled into the CV inputs of the other channel to
complete the multiplexing down to 2 outputs The clamp
circuits are disabled to allow direct drive on the inputs Such
circuits are ideal for security cameras and other multiple
video source monitoring systems
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