TDA8214 datasheet(7/9 Pages) STMICROELECTRONICS

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Vcc1

To frame amplifier

Frame

sync pulse

INPUT CURRENT

COMPENSATION

Figure 6 : Frame Oscillator

Frame output amplifier

This amplifier is able to drive directly the frame

yoke. Its output is short circuit and overload pro-

tected; it contains also a thermal protection.

The frame blanking is detected by the frame fly-

back generator. When the output voltage of the

frame amplifier exceeds VCC2-2VBE, the pulse is

detected. The line flyback detection is provided by

a comparator which compares the input line flyback

pulse to an internal reference. The burst gate pulse

position is fixed by the external RC network

(Pin 14). It is referenced to the middle of the line

flyback.

This stage will detect the coincidence between the

line sync pulse (if present) and a 2

µs sampling

pulse. This 2

µs pulse is positionned at the center

of line sync pulse when the phase loop is locked.

This sampled detection is stored by an external

capacitor Pin 8.

The identification output level is high when video

signal is present.

Important remark : minimum saw-tooth amplitude

on Pin 13 has to be 2VPP (typ. : 2.5VPP).

Vcc1

Line

Flyback

Input

Frame

Output

YOKE

Vcc1

SSC

Output

Network

400 µ A

Line

Flyback

Detection

Frame

Blanking

Detection

Burst gate

pulse

generator

Figure 7 : Super Sandcastle Generator

TDA8214B

7/9

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