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PDF LM1203 Data sheet ( Hoja de datos )
| Número de pieza | LM1203 | |
| Descripción | RGB Video Amplifier System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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January 1996
LM1203 RGB Video Amplifier System
General Description
The LM1203 is a wideband video amplifier system intended
for high resolution RGB color monitor applications In addi-
tion to three matched video amplifiers the LM1203 contains
three gated differential input black level clamp comparators
for brightness control and three matched attenuator circuits
for contrast control Each video amplifier contains a gain set
or ‘‘Drive’’ node for setting maximum system gain (Av e 4
to 10) as well as providing trim capability The LM1203 also
contains a voltage reference for the video inputs For high
resolution monochrome monitor applications see the
LM1201 Video Amplifier System datasheet
Block and Connection Diagram
Features
Y Three wideband video amplifiers (70 MHz b3dB)
Y Inherently matched (g0 1 dB or 1 2%) attenuators for
contrast control
Y Three externally gated comparators for brightness con-
trol
Y Provisions for independent gain control (Drive) of each
video amplifier
Y Video input voltage reference
Y Low impedance output driver
C1996 National Semiconductor Corporation TL H 9178
FIGURE 1
Order Number LM1203N
See NS Package Number NA28F
RRD-B30M56 Printed in U S A
TL H 9178 – 1
1 page  
FIGURE 3 LM1203 Typical Application
TL H 9178 – 3
30X resistors are added to the input pins for protection against current surges coming through the 10 mF input capacitors By increasing these resistors to well
over 100X the rise and fall times of the LM1203 can be increased for EMI considerations
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5 Page 
Additional Applications of the LM1203
Figure 9 shows how the LM1203 can be set up as a video
buffer which could be used in low cost video switcher appli-
cations Pin 14 is tied high to turn off the clamp compara-
tors The comparator input pins should be grounded as
shown Sync tip (black level if sync is not included) clamping
is provided by diodes at the amplifier inputs Note that the
clamp cap pins are tied to the Pin 11 2 4V reference This
was done along with the choice of 200X for the drive pin
resistor to establish an optimum DC output voltage The
contrast control (Pin 12) will provide the necessary gain or
attenuation required for channel balancing Changing the
contrast control setting will cause minor DC shifts at the
amplifier output which will not be objectionable as the out-
put is AC coupled to the load The dual NPN PNP emitter
follower will provide a low impedance output drive to the AC
coupled 75X output impedance setting resistor The dual
500 mF capacitors will set the low frequency response to
approximately 4 Hz
FIGURE 9 RGB Video Buffer with Diode Sync Tip Clamps and 75X Cable Driver
TL H 9178 – 9
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LM1203.PDF ] | |
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