NSC LM1296N Datasheet

February 1998

LM1296
Raster Geometry Correction System for Multi-Frequency
Displays

General Description

The LM1296 is a monolithic IC for use in the raster scanning
circuitry of a multi-frequency CRT monitor. The IC provides
an S-corrected sawtooth waveformandavariable DC output
voltage. These two outputs drive the vertical deflection am­plifier. It also provides another waveform for East-West ge­ometry correction which includes pincushion, corner, and
trapezoid controls. The geometry correction is controlled by
DC input voltages from 0V to 4V.

The raster height and the raster vertical position can be con­trolled by two DC voltage input pins that adjust the sawtooth
waveform amplitude and the variable DC output voltage. The
East-West correction of the LM1296 has height tracking and
vertical position tracking capabilities. As the height or posi­tion of the raster is adjusted the geometry correction is main­tained by the chip automatically.

The LM1296 is packaged in a 16-pin plastic DIP package.

Features

n Vertical scanning frequency 50 Hz–165 Hz

n Accepts either polarity of V sync
n DC-controlled correction terms
n Raster vertical position control
n Vertical S-correction (linearity) control
n East-West pincushion control
n East-West trapezoid control
n East-West corner control
n Provides both polarities of correction output
n East-West correction tracks raster vertical position and

height

n Compatible with LM1290 and LM1292 horizontal PLL

Applications

n Vertical deflection of monitors

LM1296 Raster Geometry Correction System for Multi-Frequency Displays

Connection Diagram

DS012894-1

FIGURE 1.

Order Number LM1296N

See NS Package Number N16A

© 1998 National Semiconductor Corporation DS012894 www.national.com

Absolute Maximum Ratings (Notes 3, 1)

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

Supply Voltage (V
Input Voltage (V

Pins 1, 2, 8, 9, 10, 16 0V ≤ V

Power Dissipation (P

Above 25˚C, Derate

Based on θ
Thermal Resistance (θ
Junction Temperature (T

) 15V

CC

)

IN

)

D

and TJ(Note 4) 1.5W

JA

) 81˚C/W

JA

) 150˚C

JMAX

≤ 5V

IN

ESD Susceptibility (Note 5) 2 kV
Storage Temperature −65˚C to +150˚C
Lead Temperature (Soldering 10 sec.) 265˚C

Operating Ratings(Note 2)

Supply Voltage (V
Input Voltage (V

Pins 1, 2, 8, 9, 10, 16 0V ≤ V

Output Current (I

Pins 11, 13, 15 −2 mA ≤ I

Temperature Range (T

) 10.8V ≤ VCC≤ 13.2V

CC

)

IN

)

OUT

) 0˚C to +70˚C

A

OUT

≤ 4V

IN

≤ 2mA

Electrical Characteristics

See Test Circuit (

Figure 2

), V

=

CC

Symbol Parameter Conditions Min Typ Max Units

I

CC

Supply Current Pins 11, 13, 15 Loaded, 2mA 26 32 mA

V SYNC Vertical Sync Input Sensitivity (Pin 7) 1%or 99%Duty Cycle

f
f
f
R
R
R
R
V

V

k

MIN
MAX
FR

IN1
IN2
IN3
IN4
O15

DC15

TEMP

Minimum Lock Frequency C
Maximum Lock Frequency C
Free Run Frequency V
Input Resistance (Pin 1) 25 kΩ
Input Resistance (Pin 2) V
Input Resistance (Pins 8, 9, 10) 50 kΩ
Input Resistance (Pin 16) 50 kΩ
SAWTOOTH OUT (Pin 15) V
Output Amplitude (R

L15

SAWTOOTH OUT (Pin 15) V
Output DC Voltage (R

L15

SAWTOOTH OUT (Pin 15) (Note 9) 1.5
Temperature Stability

k

S

V

RDCV

S-Correction of Sawtooth Output (Pin 15) V

Relative DC Voltage between V
DC OUT (Pin 13) and V
SAWTOOTH OUT (Pin 15)

=

V

V

RDCV

13−VDC15

=

(R

5kΩ)

V

TRAP

L13

Trapezoid Correction V
Output Waveform Amplitude V
(Pin 11, R

V

PIN

Pincushion Correction V

=

5kΩ) Pincushion and Corner

L11

Output Waveform Amplitude V
(Pin 11, R

=

5kΩ) Trapezoid and Corner

L11

12V; V

=

2

4V; V

=

4V; V

16

Rectangular Waveform 1 V
AC-Coupled to Pin 7
Through 0.01 µF Cap.

=

OSC

=

OSC

=

4V or 0V 40 Hz

7

=

1V 12 kΩ

2

=

4V, V

=

5kΩ)V

=

5kΩ)

2

=

4V, V

2

=

V

0V, V

2

=

V

0V, V

2

=

0V to 4V, V

2

=

4V, V

2

=

V

4V, V

2

=

4V −200 mV

1

=

1.5V 200

1

=

4V, V

2

=

4V, V

2

Corrections are Null

=

4V, V

2

=

4V, V

2

Corrections are Null

RDCV

=

0V (Note 6); T

=

25˚C unless otherwise specified

A

(Note 8) (Note 7) (Note 8)

0.15 µF 50 Hz

0.15 µF 165 Hz

=

0V 1.8

16

=

4V 3.1 V

16

=

0V 1

16

=

4V 1.7

16

=

0V to 4V 3.9 V

16

=

4V 0.5

16

=

0V 2

16

=

0V 0.87 V

8

=

4V 0.73

8

=

0V 1.9 V

10

=

4V 1.45

10

%

%

PP

PP

PP

PP

www.national.com 2

Electrical Characteristics (Continued)

See Test Circuit (

Figure 2

), V

=

CC

Symbol Parameter Conditions Min Typ Max Units

V

CNR

Corner Correction V
Output Waveform Amplitude V
(Pin 11, R

V

DC11

E-W OUT Trapezoid, Pincushion, and 4.1 V

=

5kΩ) Trapezoid and Pincushion

L11

Output Offset Voltage Corner Correction Waveforms
(Pin 11, R

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 elevated temperature is P
this device, T

Note 5: Human Body model, 100 pF capacitor discharged through a 1.5 kΩ resistor.
Note 6: Adjust V
Note 7: Typical specifications are specified at T
Note 8: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 9: Amplitude stability versus ambient temperature is defined by |V

at 70˚C and 25˚C respectively.

JMAX

1

=

5kΩ) are Null

L11

=

150˚C. The typical thermal resistance (θ

RDCV

=

0V, where V

until V

12V; V

=

2

4V; V

=

4V; V

16

RDCV

=

4V, V

2

=

4V, V

2

Corrections are Null

=

D

) of the LM1296 is 81˚C/W.

JA

=

V

RDCV

13−VDC15

=

25˚C and represent most likely parametric norm.

A

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

(T

JMAX–TA

.

|/V25x 100%, where V70and V25are the output sawtooth peak-to-peak amplitudes

70−V25

=

0V (Note 6); T

=

25˚C unless otherwise specified

A

(Note 8) (Note 7) (Note 8)

=

0V 1.1 V

9

=

4V 0.8

9

, θJAand the ambient temperature, TA. The maximum

JMAX

Test Circuit

PP

FIGURE 2.

Typical Performance Characteristics

=

T

A

25˚C, f

=

v

60 Hz, V

=

2

4V, V

=

4V, V

16

RDCV

=

0V, V

8,9,10

DS012894-2

=

Set for null correction waveforms, unless otherwise specified

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