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LM1296N データシート(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1296N
部品情報  Raster Geometry Correction System for Multi-Frequency Displays
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1296N データシート(HTML) 5 Page - National Semiconductor (TI)

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Block Diagram
Functional Description
The LM1296 outputs a sawtooth and a variable DC voltage
for the vertical deflection amplifier. It also provides the hori-
zontal deflection output circuit with a waveform for Trap-
ezoid, Pincushion and Corner correction.
Referring to
Figure 3, pin 7 (V SYNC) goes to the Sync Po-
larity Correction Block that accepts either positive-going or
negative-going sync signals. The polarity-corrected sync is
sent to the Injection-Locked Oscillator so that the sawtooth
generated is synchronized with the vertical sync. With no
sync signal AC-coupled to pin 7, the oscillator free runs at
typically 40 Hz.
There are three capacitors and one control pin connected to
the Sawtooth Waveform Generation Block. C
OSC is the tim-
ing capacitor for the Injection-Locked Oscillator. C
F is the fil-
ter capacitor for an internal circuit that detects the existence
of vertical sync and prevents the Injection-Locked Oscillator
from locking at twice the vertical sync frequency. C
ALC is for
the automatic level control (ALC) circuit. The ALC circuit
maintains the sawtooth output amplitude, which is set by the
DC voltage at pin 2 (HEIGHT), regardless of the vertical sync
frequency. Since the output sawtooth goes to the geometry
correction circuit as well, the correction waveform generated
tracks the sawtooth amplitude, i.e., the height of the CRT
raster.
The S Correction block shapes the linear sawtooth into an
S-shape sawtooth. Pin 15 (SAWTOOTH OUT) outputs the
buffered S-shape sawtooth. The amount of S correction is
controlled by the DC voltage at pin 16 (S).
Referring to
Figure 4, the extent of S correction is defined by
the following equation.
k
S = (∆A1 + ∆A2)/2A x 100%
The LM1296 is designed to drive an external vertical deflec-
tion amplifier that is operating with positive and negative
power supplies. The LM1296 outputs an S-corrected saw-
tooth with a DC level that is typical 3.85V. Pin 13 (DC OUT)
provides a DC voltage of 3.85V ± 200 mV. By applying a DC
control voltage to pin 1 (POSITION), the output voltage at pin
13 can be varied. This sets the output DC current from the
vertical deflection amplifier, which in turn sets the raster ver-
tical position.
DS012894-9
FIGURE 3.
DS012894-10
FIGURE 4.
5
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