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LM1204 データシート(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1204
部品情報  150 MHz RGB Video Amplifier System
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1204 データシート(HTML) 9 Page - National Semiconductor (TI)

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Pin Descriptions (Continued)
Back Porch Clamp Width
The LM1204 provides DC restoration or clamping during the back porch interval of the video signal
Adjust (Pin 22)
The width of LM1204’s internally generated back porch clamp signal can be varied by applying a 0V
to4VDC voltage to this pin The back porch clamp signal width can be varied from approximately
03 msto4 0 ms by applying 4V to 05V respectively By connecting the blank gate input pin (pin 24)
to VCC the back porch clamp pulse can be monitored on the bH Sync output pin (pin 26) See
Figures 4 and 5 By connecting pin 22 to VCC the LM1204 functions as a non-gated amplifier
requiring no clamping See Section 4 under application hints for further information
g
H Sync In (Pin 23)
This is the external sync input pin it accepts a negative or positive polarity signal either horizontal
sync or a composite sync (12 VPP minimum amplitude) The LM1204 also provides a negative
polarity (TTL compatible) horizontal sync or composite sync output on pin 26 If the composite video
input (pin 18) is not used then an H Sync signal should be AC coupled to this pin through a 01 mF
capacitor The gH Sync input has priority over the composite video input if both signals are present
Blank Gate In (Pin 24)
This is the blank gate input pin The LM1204 allows video blanking at the preamplifier If blanking is
desired then a TTL compatible negative polarity blanking signal should be applied to this pin During
the blanking interval all three video outputs are level shifted to the blank level set by the voltage at
pin 43 If blanking is not required then pin 24 should be biased at 4V
Connecting pin 24 to VCC will cause pin 26 to output the internally generated back porch clamp
signal The user can observe the change in back porch width as the potential at pin 22 is varied (see
Figures 4 and 5 )
Integrator Cap (Pin 25)
A 01 mF capacitor should be connected from this pin to ground This capacitor allows the LM1204 to
integrate the gH Sync input signal and genreate the proper polarity switch for bH Sync output
b
H Sync Out (Pin 26)
This output pin provides a negative polarity horizontal sync signal for other system uses There is
approximately 100 ns delay between the gH Sync input signal at pin 23 and the bH Sync output
signal at pin 26
Connecting pin 24 to VCC will cause pin 26 to output the internally generated back porch clamp
signal The user can observe the change in back porch clamp pulse width as the potential at pin 22 is
varied (See
Figures 4 and 5 )
G Feedback (Pin 28)
This is the cutoff adjustment input for the green video channel The green video output signal from
pin 30 is fed back to this input through a potentiometer thus allowing the user to individually adjust
the cutoff (black reference) level for each gun The signal level at this pin should be between 05V
and 4V
B Feedback (Pin 33)
This is the cutoff adjustment input for the blue video channel The blue video output signal from pin
35 is fed back to this input through a potentiometer thus allowing the user to individually adjust the
cutoff (black reference) level for each gun The signal level at this pin should be between 05V and
4V
R Feedback (Pin 38)
This is the cutoff adjustment input for the red video channel The red video output signal from pin 40
is fed back to this input through a potentiometer thus allowing the user to individualy adjust the cutoff
(black reference) level for each gun The signal level at this pin should be between 05V and 4V
G Video Output
This is the green channel video output
(Pin 30)
B Video Output
This is the blue channel video output
(Pin 35)
R Video Output
This is the red channel video output
(Pin 40)
G Blank Clamp Cap
A 0022 mFto0 1 mF capacitor should be connected from this pin to ground This capacitor allows
(Pin 32)
blanking for the green video channel
B Blank Clamp Cap
A 0022 mFto0 1 mF capacitor should be connected from this pin to ground This capacitor allows
(Pin 37)
blanking for the blue video channel
R Blank Clamp Cap
A 0022 mFto0 1 mF capacitor should be connected from this pin to ground This capacitor allows
(Pin 42)
blanking for the red video channel
Blank Level Adjust
This pin serves two functions depending on whether the LM1204 is used with blanking or without
(Pin 43)
blanking If blanking is not selected then pin 20 should be biased at 20 VDC and pin 43 assumes the
role of brightness control Varying the potential at pin 43 will simultaneously DC offset the video
output signals of all three channels (See
Figure 4 ) If the LM1204 is used with blanking then during
the blanking interval all three video output signals will be level shifted to the blank level The desired
blank level can be set by adjusting the potential at pin 43 Brightness control is now made possible
by varying the potential at pin 20 Adjusting the brightness control DC offsets the video portion of the
signal relative to the fixed blank level (all channels are affected simultaneously) See
Figure 5
GND (Pins 8 12 16 27
Ground All ground pins must be connected to the ground plane
29 34 39)
9


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