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PDF LM1201N Data sheet ( Hoja de datos )

Número de pieza LM1201N
Descripción Video Amplifier System
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LM1201N Hoja de datos, Descripción, Manual

January 1995
LM1201 Video Amplifier System
General Description
The LM1201 is a wideband video amplifier system intended
for high resolution monochrome or RGB monitor applica-
tions In addition to the wideband video amplifier the
LM1201 contains a gated differential input black level clamp
comparator for brightness control and an attenuator circuit
for contrast control The LM1201 also contains a voltage
reference for the video input For medium resolution RGB
color monitor applications also see the LM1203 Video Am-
plifier System data sheet
Features
Y Wideband video amplifier (200 MHz b3 dB)
Y Attenuator circuit for contrast control (l40 dB range)
Y Externally gated comparator for brightness control
Y Provisions for external gain set and peaking of video
amplifier
Y Video input voltage reference
Y Low impedance output driver
Typical Applications
Y CRT video amplifiers
Y Video switches
Y High frequency video preamplifiers
Y Wideband gain controls
Y PC monitors
Y Workstations
Y Facsimile machines
Y Printers
Block and Connection Diagram
FIGURE 1
Order Number LM1201M or LM1201N
See NS Package Number M16A or N16E
TL H 10006 – 1
C1996 National Semiconductor Corporation TL H 10006
RRD-B30M56 Printed in U S A

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LM1201N pdf
Circuit Description
Figure 5 is a block diagram of the LM1201 along with the
contrast and brightness controls The contrast control is a
DC operated attenuator which varies the AC gain of the
amplifier without introducing any signal distortions or DC
output shift The brightness control function requires a
‘‘sample and hold’’ circuit (black level clamp) which holds
the DC bias of the video amplifier and CRT cathodes con-
stant during the black level reference portion of the video
waveform The clamp comparator when gated on during
this reference period will charge or discharge the clamp
capacitor until the non-inverting input of the clamp compara-
tor matches that of the inverting input voltage which was set
by the brightness control
Figure 6 is a simplified schematic of the LM1201 video am-
plifier along with the recommended external components
The IC pin numbers are circled with all external components
shown outside of the dashed line The video input is applied
to pin 16 via the 10 mF coupling capacitor DC bias to the
video input is through the 10 kX resistor which is connected
to the 2 6V reference at pin 3 The low frequency roll-off of
the amplifier is set by these two components Transistor Q1
buffers the video signal to the base of Q2 The Q2 collector
current is then directed to the VCC1 supply through Q3 or to
VCC2 through Q4 and the 500X load resistor depending
upon the differential DC voltage at the bases of Q3 and Q4
The Q3 and Q4 differential base voltage is determined by
the contrast control circuit which is described below The
black level DC voltage at the collector of Q4 is maintained
by Q5 and Q6 which are part of the black level clamp circuit
also described below The video signal appearing at the col-
lector of Q4 is then buffered by Q7 and level shifted down
by Z1 and Q8 to the base of Q9 which will then provide
additional system gain
TL H 10006 – 5
FIGURE 5 Block Diagram of LM201 Video Amplifier with Contrast and Black Level Control
5 http www national com

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LM1201N arduino
Applications Information (Continued)
TL H 10006 – 11
FIGURE 11 High Frequency Video Switch with Common Contrast and Brightness Controls
11 http www national com

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