LM1290 National Semiconductor, LM1290 Datasheet
LM1290
Manufacturer Part Number
LM1290
Description
Autosync Horizontal Deflection Processor
Manufacturer
National Semiconductor
Datasheet
1.LM1290.pdf
(9 pages)
Available stocks
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Part Number
Manufacturer
Quantity
Price
Part Number:
LM1290N
Manufacturer:
NS/国半
Quantity:
20 000
© 1999 National Semiconductor Corporation
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.
Connection Diagram
DS012917
See NS Package Number N14A
Order Number LM1290N
FIGURE 1.
Features
n Full autosync — 22 kHz to 110 kHz with no component
n No manufacturing trims needed — internal VCO
n Sample-and-hold circuit for fast top-of-screen phase
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
n Low V
n H output transistor protected against accidental turn on
n Capacitor-programmable frequency ramping, d f
switching or external adjustments
capacitor trimmed on chip
recovery, even when using composite sync
during flyback
protects H output transistor during scanning mode
changes
CC
disables H drive (V
DS012917-1
CC
<
8.5V)
CC
powered down
January 1997
www.national.com
VCO
/ d t ,
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