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LM1209 Datasheet

  • LM1209

  • National Semiconductor [130 MHz/100 MHz RGB Video Amplifier...

  • NSC

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Applications Information
(Continued)
Figure 5
shows the block diagram of a typical analog RGB
color monitor The RGB monitor is used with CAD CAM
work stations PC鈥檚 arcade games and in a wide range of
other applications that benefit from the use of color display
terminals The RGB color monitor characteristics may differ
in such ways as sweep rates screen size CRT color trio
spacing (dot pitch) or in video amplifier bandwidths but will
still be generally configured as shown in
Figure 5
Separate
horizontal and vertical sync signals may be required or they
may be contained in the green video input signal The video
input signals are usually supplied by coax cable which is
terminated into 75X at the monitor input and internally AC
coupled to the video amplifiers These input signals are ap-
proximately 1V peak to peak in amplitude and at the input of
the high voltage video section approximately 5V peak to
peak At the cathode of the CRT the video signals can be as
high as 60V peak to peak One important requirement of the
three video amplifiers is that they match and track each
other over the contrast and brightness control range The
Figure 5
block labeled 鈥樷€榁IDEO AMPLIFICATION WITH
GAIN AND DC CONTROL鈥欌€?describes the function of the
LM1208 LM1209 which contains the three matched video
amplifiers contrast control and brightness control The
LM1208 LM1209 also provides the capability to blank at the
cathode of the CRT
Functional Description
Figure 6
is a detailed block diagram of the green channel of
the LM1208 LM1209 along with the recommended external
components The IC pin numbers are circled and all external
components are shown outside the dashed line The other
two video channels are identical to the green channel only
the numbers to the pins unique to each channel are differ-
ent The input video is normally terminated into 75X The
termination resistor depends on the impedance of the coax
cable being used 75X being the most common impedance
used in video applications The video signal is AC coupled
through a 10
mF
capacitor to the input pin 6 There is no
standard for the DC level of a video signal therefore the
signal must be AC coupled to the LM1208 LM1209 Internal
to the LM1208 LM1209 is a 2 8V reference giving the input
video an offset voltage of 2 8V This voltage was selected to
give the input video enough DC offset to guarantee that the
lowest voltage of the video signal at pin 6 is far enough
above ground to keep the LM1208 LM1209 in the active
region The 200X resistor at the input is for ESD protection
and for current limiting during any voltage surge that may
occur at the input driving pin 6 above V
CC
The input video
signal is buffered by
b
A1 In this circuit description an in-
verting amplifier is shown with a 鈥樷€?/div>
b
鈥欌€?(minus sign) in front of
the amplifier designation The output of
b
A1 goes to the
contrast and drive attenuator sections
The contrast and drive control sections are virtually identi-
cal Both sections take a 0V to 4V input voltage 4V giving
the maximum gain for either the contrast or the drive This is
a high impedance input allowing for an easy interface to 5V
DACs One may also use 100k potentiometers with no deg-
radation in performance The contrast control section is
common to all three channels It converts the input voltage
at pin 12 to a couple of internal DC voltages that control the
gain of the contrast attenuator Referring to the Attenuation
vs Contrast Voltage under typical performance characteris-
tics note that a 4V control voltage results in no attenuation
of the video signal A 0 25V control voltage results in an
attenuation of 40 dB Again note that these internal control
voltages are common to all three channels To minimize
crosstalk these voltages go to pins 1 and 2 Minimizing
crosstalk is done by adding the RC network shown in the
block diagram
(Figure 6)
TL H 11884 鈥?10
FIGURE 5 Typical RGB Color Monitor Block Diagram
9
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