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PDF LM1209 Data sheet ( Hoja de datos )
| Número de pieza | LM1209 | |
| Descripción | (LM1208) 130 MHz/100 MHz RGB Video Amplifier System with Blanking | |
| Fabricantes | National | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM1209 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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January 1996
LM1208 LM1209
130 MHz 100 MHz RGB Video Amplifier System
with Blanking
General Description
The LM1208 LM1209 is a very high frequency video amplifi-
er system intended for use in high resolution RGB monitor
applications In addition to the three matched video amplifi-
ers the LM1208 LM1209 contains three gated single end-
ed input black level clamp comparators for brightness con-
trol three matched DC controlled attenuators for contrast
control and three DC controlled drive attenuators providing
independent full range gain control in each channel for wide
range white balance All DC control inputs offer high input
impedance and an operation range from 0V to 4V for easy
interface to bus controlled alignment systems The
LM1208 LM1209 also contains a blanking circuit which
clamps the video output voltage during blanking to within
0 1V above ground This feature provides blanking capabili-
ty at the cathodes of the CRT A spot killer is provided for
CRT phosphor protection during power-down
Features
Y Three wideband video amplifiers 130 MHz
(4 VPP output)
b3 dB
Y Matched (g0 1 dB or 1 2%) attenuators for contrast
control
Y Three externally gated single ended input comparators
for cutoff and brightness control
Y 0V to 4V high input impedance DC contrast control
(l40 dB range)
Y 0V to 4V high input impedance DC full range gain con-
trol (Drive) for each video channel (l40 dB range)
Y Spot killer blanks outputs when VCC k 10 6V
Y Capable of 7 VPP output swing (slight reduction in
bandwidth)
Y Output stage blanking
Y Output stage directly drives most hybrid or discrete
CRT drivers
Applications
Y High resolution RGB CRT monitors
Y Video AGC amplifiers
Y Wideband amplifiers with gain and DC offset controls
Y Interface amplifiers for LCD or CCD systems
Block and Connection Diagram
C1996 National Semiconductor Corporation TL H 11884
FIGURE 1
Order Number LM1208N or LM1209N
See NS Package Number N28B
RRD-B30M66 Printed in U S A
TL H 11884 – 1
1 page  
Typical Performance Characteristics (VCC e 12V TA e 25 C unless otherwise specified) (Continued)
LM1209 Crosstalk vs Frequency
LM1209 Contrast vs Frequency
TL H 11884 – 25
LM1209 Drive vs Frequency
TL H 11884 – 26
TL H 11884 – 27
5 http www national com
5 Page 
Functional Description (Continued)
FIGURE 6 Block Diagram of LM1208 LM1209 Video Amplifier
TL H 11884 – 11
TL H 11884 – 12
FIGURE 7 Timing Diagram
Circuit Description
VIDEO AMPLIFIER INPUT STAGE
Figure 8 is a simplified schematic of one of the three video
amplifiers input stage along with the recommended external
components The IC pin numbers are circled and all external
components are shown outside the dashed line The video
input is applied to pin 6 via a 10 mF coupling capacitor and a
30X resistor The resistor is added to limit the current
through the input pin should an applied voltage surge rise
above VCC or drop below ground The performance of the
LM1208 LM1209 is not degraded by the 30X resistor How-
ever if EMI is a concern this resistor can be increased to
well over 100X where the rise and fall times will start to
become longer DC bias to the input pin is provided by Q5
and its associated input circuitry Z1 is a 5 6V zener that
generates the input bias voltage Q1 is a buffer to the zener
reference voltage with 5 0V generated at its emitter Q3 and
Q4 are connected as diodes Q2 is close to being a diode in
this circuit This configuration will give about 2 0V at the
collector of Q2 R2 and R3 are a voltage divider setting the
base of Q5 to about 3 5V This sets the emitter of Q5 to
about 2 8V the bias voltage of the video input This bias
voltage is necessary to assure that the entire video signal
stays within the active operating region of the LM1208
LM1209 The bias voltage goes through R6 a 20k resistor
to the video input at pin 6 R4 and R6 are of the same value
and R4 is used to compensate for beta variations of the
11 http www national com
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet LM1209.PDF ] | |
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