LM1295N National Semiconductor, LM1295N Datasheet

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LM1295N

Manufacturer Part Number
LM1295N
Description
DC Controlled Geometry Correction System for Continuous Sync Monitors [Life-time buy]
Manufacturer
National Semiconductor
Datasheet

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LM1295N
Manufacturer:
NS/国半
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20 000
© 1999 National Semiconductor Corporation
LM1295
DC Controlled Geometry Correction System for
Continuous Sync Monitors
General Description
The LM1295 is specifically designed for use in a continuous
sync monitor. The injection-locked vertical oscillator oper-
ates from 50 Hz to 170 Hz, covering all known video moni-
tors. A differential output current is provided in order to pre-
vent ground interaction.
The IC provides two outputs composed of the summation of
DC controlled 1st and 2nd order output terms. The first out-
put corrects for EW pincushion and trapezoid. The second
corrects for parallelogram and bow.
A DC controlled output is provided for vertical dynamic focus
correction.
The IC is packaged in a 24-pin narrow DIP package and op-
erates on a single 12V power supply.
Connection Diagram
DS012324
FIGURE 1. Order Number LM1295N
See NS Package Number N24C
Features
n Vertical scanning frequency 50 Hz–170 Hz
n DC controlled correction term amplitudes
n Up to 125 kHz bandwidth for dynamic input signals
n Minimum external parts count
n Multiple IC connection for convergence applications
n Stable vertical amplitude over temperature
n Compatible with the LM1291 Horizontal PLL in a H/V
n Dynamic vertical deflection correction for second anode
n Both positive and negative going correction signals
flexibility
system
high voltage drop
DS012324-1
www.national.com
April 1999

Related parts for LM1295N

LM1295N Summary of contents

Page 1

... Stable vertical amplitude over temperature n Compatible with the LM1291 Horizontal PLL in a H/V system n Dynamic vertical deflection correction for second anode high voltage drop n Both positive and negative going correction signals DS012324-1 FIGURE 1. Order Number LM1295N See NS Package Number N24C April 1999 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 (DC, pins 10, 11, 12, 13, 15) Input Voltage (AC, Pin 4) Power Dissipation (Note 4) (Above 25˚C Derate Based on and ...

Page 3

... Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T allowable power dissipation at any temperature 150˚C. The typical thermal resistance ( these parts when board mounted follow: LM1295N 70˚C/W. Jmax JA Note 5: Human body model, 100 pF capacitor discharged through a 1 25˚ ...

Page 4

Test Circuit Typical Performance Characteristics Lowest Lock Frequency vs OSC Cap Graph 1 www.national.com FIGURE 2. = 25˚ 4V Height Dyn Height DS012324-12 4 DS012324 ...

Page 5

Typical Performance Characteristics Circuit — Figure 2 H Dyn Width Output (Pin 9) H Dyn Width Output (Pin 9) H Dyn Ctr Output (Pin 14) = 25˚ 100 Hz Height H Dyn Width Output (Pin ...

Page 6

Typical Performance Characteristics Circuit — Figure 2 (Continued) H Dyn Cntr Output (Pin 14) V Dyn Focus Output (Pin 16) −V Drive Output (Pin 23) Circuit Description (See Figure 3 , Block Diagram) The LM1295 has outputs which provide signals ...

Page 7

Circuit Description (Continued) VERTICAL OSCILLATOR The vertical oscillator is an injection-locked ramp generator with automatic level control. The automatic level control maintains the oscillator output ramp height with changes in input frequency. The oscillator requires negative-going TTL level vertical sync ...

Page 8

Pin Descriptions See Figure 4 through Figure 8 for Input and Output schemat- ics. GND (Pin 1): This pin should be connected to the power ground at pin 17. V Height (Pin 2): Vertical Height. A voltage between 0V and ...

Page 9

Pin Descriptions (Continued) perature coefficient corrects for the negative temperature co- efficient of the LM1295. The resistor should be located near the LM1295. The recommended value Rvert (Pin 22): Vertical Resistor. The other end of the ...

Page 10

Typical Application Note: LM1295 is designed to drive a differential input vertical deflection amplifier. The LM1295, however, can also drive a single-ended input vertical deflection amplifier by just using either the +V drive or −V drive pins. www.national.com FIGURE 9. ...

Page 11

... 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 LM1295N NS Package Number N24C 2. A critical component is any component of a life ...

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