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LM1291 Datasheet

  • LM1291

  • National Semiconductor [Video PLL System for Continuous-Syn...

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LM1291 Video PLL System for Continuous-Sync Monitors
June 1995
LM1291
Video PLL System for Continuous-Sync Monitors
General Description
The LM1291 is an integrated horizontal time base solution
specifically designed to operate in continuous-sync video
monitors It automatically synchronizes to any H frequency
from 22 kHz to 125 kHz and provides the drive pulse to the
high power deflection circuit
Available sync processing includes a vertical sync separator
and a composite video sync stripper An internal sync selec-
tion scheme gives highest priority to separate H and V sync
then composite sync and finally sync on video no external
switching between sync sources is necessary The LM1291
provides polarity-normalized H HV and V sync outputs
along with logic flags which show the respective input polar-
ities
The design uses an on-chip FVC (Frequency-to-Voltage
Converter) to set the center frequency of the VCO (Voltage-
Controlled Oscillator) This technique allows autosync oper-
ation over the entire frequency range using just one opti-
mized set of external components
The system includes a second phase detector which com-
pensates for storage time variation in the horizontal output
transistor the picture鈥檚 horizontal position is thus indepen-
dent of temperature and component variance
The LM1291 provides DC control pins for H Drive duty cycle
and flyback phase
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Wide continuous autosync range 22 kHz to 125 kHz
(1 5 7) with no component switching or external adjust-
ments
No manufacturing trims required internal VCO capaci-
tor trimmed on chip
No costly high-precision components needed
Low phase jitter (1 3 ns at 100 kHz)
DC controlled H phase and duty cycle
Video mute pulse for blanking during H frequency
transitions
Input sync prioritization
Clamp pulse position and width control
Continuous clamp pulse output even with no sync input
Resistor-programmable minimum and maximum VCO
frequency
X-ray input disables H drive and mutes video until V
CC
powered down
H drive disabled for V
CC
k
9 5V
Horizontal output transistor protected against accidental
turn-on during flyback
Capacitor-programmable frequency ramping df
VCO
dt
protects H output transistor during scanning mode
changes
Connection Diagram
TL H 12323 鈥?1
FIGURE 1
Order Number LM1291N
See NS Package Number N28B
C
1995 National Semiconductor Corporation
TL H 12323
RRD-B30M115 Printed in U S A

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