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LM1292N Datasheet

  • LM1292N

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

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LM1292 Video PLL System for Continuous-Sync Monitors
April 1999
LM1292
Video PLL System for Continuous-Sync Monitors
General Description
The LM1292 is a very low jitter, integrated horizontal time
base solution specifically designed to operate in high perfor-
mance, 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 cir-
cuit.
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 LM1292
provides polarity-normalized H/HV and V sync outputs.
The
LM1292
design
uses
an
on-chip
FVC
(Frequency-to-Voltage Converter) to set the center fre-
quency of the VCO (Voltage-Controlled Oscillator). This
technique allows autosync operation over the entire fre-
quency range using just one optimized set of external com-
ponents.
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 LM1292 provides DC control pins for H Drive duty cycle
and flyback phase.
Features
n
Wide continuous autosync range 鈥?22 kHz鈥?25 kHz
(1:5.7) with no component switching or external
adjustments
n
No manufacturing trims required 鈥?internal VCO
capacitor trimmed on chip
n
No costly high-precision components needed
n
Very low phase jitter (below 800 ps at 125 kHz)
n
DC controlled H phase and duty cycle
n
Video mute pulse for blanking during H frequency
transitions
n
Input sync prioritization
n
Clamp pulse position and width control
n
Continuous clamp pulse output, even with no sync input
n
Resistor-programmable minimum and maximum VCO
frequency
n
X-ray input disables H drive and mutes video until V
CC
powered down
n
H drive disabled for V
CC
<
9.5V
n
Horizontal output transistor protected against accidental
turn-on during flyback
n
Capacitor-programmable frequency ramping, df
vco
/dt,
protects H output transistor during scanning mode
changes
Connection Diagram
DS012844-1
FIGURE 1. Order Number LM1292N
See NS Package Number N28B
漏 1999 National Semiconductor Corporation
DS012844
www.national.com

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