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LM1290 Datasheet

  • LM1290

  • Autosync Horizontal Deflection Processor

  • 9頁(yè)

  • NSC

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LM1290 Autosync Horizontal Deflection Processor
January 1997
LM1290
Autosync Horizontal Deflection Processor
General Description
The LM1290 is a high-performance, low-cost deflection solu-
tion for autosync monitors.
The LM1290 provides full autosync capability, DC controls
and complete freedom from manufacturing trims. Its continu-
ous capture range is from 22 kHz to 110 kHz (1:5). Mode
change frequency ramping, for protection of the horizontal
deflection output transistor, is programmable by using an ex-
ternal capacitor.
Together with the National Semiconductor LM1296 Raster
Geometry Correction System for Multi-Frequency Displays,
excellent performance is offered. The two-chip solution pro-
vides the advantage of good jitter performance, simplified
board layout, and lower system cost.
The LM1290 is packaged in a 14-pin plastic DIP package.
Features
n
Full autosync 鈥?22 kHz to 110 kHz with no component
switching or external adjustments
n
No manufacturing trims needed 鈥?internal VCO
capacitor trimmed on chip
n
Sample-and-hold circuit for fast top-of-screen phase
recovery, even when using composite sync
n
DC-controlled H phase and duty cycle
n
Resistor-programmable minimum VCO frequency
n
Excellent jitter performance
n
X-ray input disables H drive until V
CC
powered down
n
Low V
CC
disables H drive (V
CC
<
8.5V)
n
H 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
DS012917-1
FIGURE 1.
Order Number LM1290N
See NS Package Number N14A
漏 1999 National Semiconductor Corporation
DS012917
www.national.com

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