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PDF LM1204V Data sheet ( Hoja de datos )
| Número de pieza | LM1204V | |
| Descripción | 150 MHz RGB Video Amplifier System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 1994
LM1204 150 MHz RGB Video Amplifier System
General Description
The LM1204 is a triple 150 MHz video amplifier system
designed specifically for high resolution RGB video display
applications In addition to three matched video amplifiers
the LM1204 contains a DC operated contrast control a DC
operated drive control for each amplifier and a dual clamp-
ing system for both brightness control and video blanking
The LM1204 also contains a back porch clamp pulse gener-
ator which is activated by an externally supplied gH HV
sync signal or by an external composite video signal The
gH HV sync input will have priority over the composite vid-
eo input A single bH HV sync output is provided for the
automatically selected sync input signal The back porch
clamp pulse width is user adjustable from 0 3 ms to 4 ms
The LM1204 video output stage will directly drive most
Hybrid or discrete CRT amplfier input stages without the
need for an external buffer transistor The device has been
designed to operate from a 12V supply with all DC controls
operating over a 0V to 4V range providing for an easy inter-
face to serial digital buss controlled monitors
Features
Y Built-in video blanking function
Y Built-in sync separator for composite video input
Y Includes DC restoration of video signals
Y Back porch clamp pulse width user adjustable
Y DC control of brightness contrast blanking level drive
and cutoff
Y DC controls are 0V to 4V for easy interfacing to a
digitally controlled system
Key Specifications
Y 150 MHz large signal bandwidth (typ)
Y 2 3 ns rise fall times (typ)
Y 0 1 dB contrast tracking (typ)
Y g3 dB drive (D gain) adjustments on R G B channels
(typ)
Applications
Y High resolution CRT monitors
Y Video AGC amplifier
Y Wideband amplifier with gain and DC offset control
Block Diagram and Connection Diagram
Top View
C1995 National Semiconductor Corporation TL H 11238
Ordering Information
Order Number LM1204V
See NS Package Number V44A
TL H 11238 – 1
RRD-B30M115 Printed in U S A
1 page  
Typical Performance Characteristics VCC e 12V TA e 25 C unless otherwise specified
Attenuation vs Contrast
Control Voltage ( f e 12 kHz)
Attenuation vs Drive
Control Voltage ( f e 12 kHz)
Back Porch Clamp Pulse
Width vs Pin 22 Voltage
Minimum External gH
Sync Input Level (VPP)
vs Input Duty Cycle (%)
Contrast vs Frequency
Drive Control vs Frequency
Crosstalk vs Frequency
TL H 11238 – 2
5
5 Page 
3 0 Stability Considerations (Continued)
series with a capacitor connected from the video output pin
to ground (see Test Circuit Figure 1 ) A 110X to 200X
resistor in series with 10 pF is quite adequate for most appli-
cations However if oscillations don’t cease then the value
of the resistor should be decreased or the value of the ca-
pacitor should be increased or a combination of the two
LM1204
Non-Gated High
Frequency Application
By connecting the back porch width adjust pin (pin 22) to
VCC the LM1204 functions as a non-gated amplifier requir-
ing no sync or blanking signals Figure 9 shows a triple high
frequency amplifier with variable gain and DC offset control
In this mode of operation filtered DC feedback must be
provided to pins 28 33 and 38 as shown in Figure 9
FIGURE 2 Block Diagram Showing Timing Circuitry and Green Video Channel
TL H 11238 – 9
FIGURE 3 Composite Video and Timing Signals
11
TL H 11238 – 10
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LM1204V.PDF ] | |
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