NSC LM1295N Datasheet

LM1295
DC Controlled Geometry Correction System for
Continuous Sync Monitors

LM1295 DC Controlled Geometry Correction System for Continuous Sync Monitors

April 1999

General Description

The LM1295 is specifically designed for use in a continuous
sync monitor. The injection-locked vertical oscillator oper­ates from 50 Hz to 170 Hz, covering all known video moni­tors. A differential output current is provided in order to pre­vent ground interaction.

The IC provides two outputs composed of the summation of
DC controlled 1st and 2nd order output terms. The first out­put corrects for EW pincushion and trapezoid. The second
corrects for parallelogram and bow.

A DCcontrolled output is provided for vertical dynamic focus
correction.

The IC is packaged in a 24-pin narrow DIP package and op­erates on a single 12V power supply.

Connection Diagram

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

flexibility

n 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

© 1999 National Semiconductor Corporation DS012324 www.national.com

Absolute Maximum Ratings (Notes 1, 3)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage 15V
Input Voltage

(DC, pins 2, 4, 6, 10, 11, 12, 13, 15) 5V
Input Voltage (AC, Pin 4) 5 V
Power Dissipation (Note 4)

(Above 25˚C Derate Based on

and TJ) 1.8W

θ

JA

Thermal Resistance (θ
Junction Temperature (T

) 70˚C/W

JA

) 150˚C

J

ESD Susceptibility (Note 5) 1.8 kV
Storage Temperature −65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.) 265˚C

Operating Ratings (Note 2)

Operating Temperature Range −20˚C to +80˚C

PP

Supply Voltage (V
Input Voltage

(DC, pins 2, 4, 6, 10, 11, 12,

13, 15) 4V

Input Voltage

(AC, pin 4) 4 V

) 10.8V ≤ VCC≤ 13.2V

CC

PP

Electrical Characteristics

See Test Circuit (

Figure 2

); T

A

=

25˚C; V

Symbol Parameter Conditions

I

CC

V
R

F

FR

F

max

Supply Current All Control Inputs=3V

Internal Ref Voltage at Pin 8 8.2 V

REF

Input Resistance Pins 6, 10–13, 15

IN

Free-Run Frequency 45 Hz

Maximum Frequency 170 Hz
Cntlbw Control Inputs Bandwidth Pins 6, 10–13, 15 125 kHz
V

V

V
V

V

V

V

V

V

CR

CR

CP

Vertical Height Temperature

HTS

Stability

Vertical Differential Output Current V Height=4V, V Dyn Height=4V,

DIFF

V Sync High Input Voltage 2.4 V(min)

SYNH

V Sync Low Input Voltage

SYNL

Vertical Output CMRR V

CMRR

Vertical Output PSSR V

PSRR

Vertical Peak Output Voltage R

OP-P

Vertical Ramp Distortion (Note 8) V Height=4V,

RERR

Vertical Parabola Distortion (Note 9) V Height=2.2V, F=100 Hz,

SOERR

First Order (Ramp) Correction,

FO

H Dyn Cntr (Pin 14)

First Order (Ramp) Correction,

FO

H Dyn Width (Pin 19)

Parabola Correction Range,

SO

H Dyn Cntr (Pin 14),

H Dyn Width (Pin 9),

V Dyn Focus (Pin 16)

=

12V.

CC

V Height=4V, V Dyn Height=3V,

=

F=100 Hz, T

0˚C to 70˚C (Note 9)

A

Pin 24 Minus Pin 23

=

1V to 4V, V Height=2V,

O

V Dyn Height=3V

=

10.8V to 13.2V, V Height=2V,

CC

V Dyn Height=3V

=

10k

L

V Dyn Height=3V

V Dyn Height=3V
Pin 12=0V

Pin 12=4V
V Dyn Height=3V, V Height=4V,
Parabola Nulled

Pin 11=0V
Pin 11=4V
V Dyn Height=3V, V Height=4V,
Parabola Nulled

Pins 10, 13, 15=0V
Pins 10, 13, 15=4V
V Dyn Height=3V, V Height=4V,
Ramp Nulled for H Dyn Cntr and H Dyn
Width

Typical

(Note 6)

Limit

(Note 7)

25 35

50 30

1

1 mA(min)

0.8

30 dB

30 dB

65

1

8

2.50

2.25

0.85

0.75

1.2

1.0

Units

mA

(max)

kΩ

(min)

%

V

(max)

V

(min)

%

%

V

V

V

PP

PP

PP

PP

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Electrical Characteristics (Continued)

See Test Circuit (

Figure 2

); T

A

=

25˚C; V

Symbol Parameter Conditions

V

I

O

Output DC Bias Pins 9, 14 and 16; All Control

ODC

Output Current Pins 9, 14 and 16 5.0 mA

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and

test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may de­grade when the device is not operated under the listed test conditions.

Note 3: All voltages are measured wIth respect to GND, unless otherwise specified.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T

allowable power dissipation at any temperature is P

=

T

150˚C. The typical thermal resistance (θ

Jmax

Note 5: Human body model, 100 pF capacitor discharged through a 1.5 kΩ resistor.
Note 6: Typicals are at T
Note 7: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: The deviation from a straight line drawn through measured points at 5%and 95%of the ramp is used to calculate distortion.

Distortion=100 (deviation, volts)/(95%value − 5%value, volts). Deviations are measured at
Note 9: The deviation from a theoretical parabola drawn through the apex of the actual parabola is used to calculate distortion.
Distortion=100 (deviation, volts)/(theoretical parabola, volts) at measuring point. Nine points are measured.
Note 10: The amplitude stability versus temperature is typically 1%or less at 100 Hz when a standard 10k 5

21 and 22 and located close to the package. The negative temperature coefficient of the resistor corrects for the negative temperature coefficient of the LM1295. The
typical amplitude stability of the LM1295 by itself is 2%.

=

=

T

25˚C and represent most likely parametric norm.

A

J

=

12V.

CC

Inputs at 2.2V

=

D

) of these parts when board mounted follow: LM1295N 70˚C/W.

JA

)/θJAor the number given in the Absolute Maximum Ratings, whichever is lower. For this device,

(T

Jmax−TA

Jmax

1

⁄3and2⁄3of the ramp time period.

Typical

(Note 6)

Limit

(Note 7)

4.0 V

, θJAand the ambient temperature, TA. The maximum

1

%

⁄4W carbon film resistor is connected between pins

Units

DC

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Test Circuit

FIGURE 2.

Typical Performance Characteristics

DS012324-2

=

T

25˚C, V

A

Height

=

0V to 4V, V

Dyn Height

=

3V

Lowest Lock Frequency vs OSC Cap

Graph 1

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DS012324-12