LM1290N National Semiconductor, LM1290N Datasheet

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LM1290N

Manufacturer Part Number
LM1290N
Description
Autosync Horizontal Deflection Processor [Life-time buy]
Manufacturer
National Semiconductor
Datasheet

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LM1290N
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© 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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LM1290N Summary of contents

Page 1

... Low V disables H drive ( output transistor protected against accidental turn on during flyback n Capacitor-programmable frequency ramping protects H output transistor during scanning mode changes DS012917-1 FIGURE 1. Order Number LM1290N See NS Package Number N14A January 1997 powered down CC < 8.5V VCO www.national.com ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Input Voltage ( Pin 1 Pins Pin 10 Pin 12 Output Sink Current, Pin 7 Power Dissipation ( (Above 25˚C, derate based on ...

Page 3

... H Drive Output Enabled Above Threshold: H Drive Output Disabled , JMAX = (T − the number given in the Absolute Maximum Ratings, whichever is lower. For D JMAX the LM1290N is 75˚C/W. JA resistor. = −100 µ µs and T = 3.5 µs where T 1 FBP d 3 Typical Limit Units ...

Page 4

Test Circuit System Block Diagram www.national.com FIGURE 2. FIGURE 3. 4 DS012917-2 DS012917-3 ...

Page 5

Pin Descriptions See Figure 4 through Figure 10 for input and output sche- matics. Pin 1 — resistor from this pin to ground sets the free MIN run frequency of the LM1290. The free run frequency should ...

Page 6

Input/Output Schematics FIGURE 7. FIGURE 8. www.national.com (Continued) DS012917-6 FIGURE 6. DS012917-7 DS012917-8 6 DS012917-9 FIGURE 9. DS012917-10 FIGURE 10. ...

Page 7

Application Hints 1. Phase Control for Geometry Correction: Pin 10 (PHASE) is designed to control static phase (picture horizontal position) as well as dynamic phase for geom- etry correction. Complete control of static and dynamic phase can be achieved by ...

Page 8

Typical Application *Actual value depends on the application and the ambient noise level inside the monitor. www.national.com FIGURE 12. 8 DS012917-12 ...

Page 9

... Italiano National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. Order Number LM1290N NS Package Number N14A 2. A critical component is any component of a life ...

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