TEA2130 查看數據表（PDF） - STMicroelectronics

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TEA2130

TV AND SATELLITE DECODER SCANNING PROCESSOR

STMicroelectronics 

TEA2130

BLOCK DIAGRAM

18

17

16

15

19

LINE SYNCHRO

VCO

FRAME

SEPARATOR

500kHz

SEPARATOR

LS

2µs

20

NOISE

MEASURMENT

1 VCC /2

Mute

VREF

Φ1

500kHz

2

AUTO VCR

SWITCH

FRAME

LOGIC

3

Burst

ϕ1

ϕ2 Mute

DIGITAL MUT

2µs

Mute

LINE LOGIC

50/60Hz

Ident 60Hz

FRAME SAWTOOTH

GENERATOR

RAZ

14

Φ2

Burst

SUPER SAND

CASTLE GENERATOR

13

12

Inhibition

PHASE CONTROL

LINE

11

LINE

LINE OUTPUT

MONOST

OUTPUT

1.3V

Mute

VOLTAGE

REFERENCE

10

1.3V

9

FRAME SECURITY

50/60Hz &

RAZ LINE SAWTOOTH

8

DETECTION

MUT OUTPUT

GENERATOR

4

5

6

7

GND

VC C

GENERAL DESCRIPTION

Introduction

This integrated circuit uses high density I2L bipolar

technology and combines analog signal process-

ing with digital processing.

Timing signals are obtained from a voltage-control-

led oscillator (VCO) operating at 500kHz by means

of a cheap ceramic resonator. This avoid the fre-

quency adjustment normally required with line and

frame oscillators.

A chain of dividers and appropriate logic circuitry

produces very accurate defined sampling pulses

and the necessary timing signals.

Internal Functions

- Horizontal scanning processor

- Frame scanning processor

- B class frame output stage using an external

power amplifier with flyback generator

- Line and frame synchronization separation

- Dual phase-locked loop horizontal scanning

- High performance frame and line synchronization

with interlacing control.

- Supersandcastle generator with reduced burst

gate pulse for 60Hz

- Automatic 50Hz / 60Hz standard identification

- Frame saw-tooth generator

- Digital video identification circuit

- Very steady free running mode of the line and

frame oscillator when no video is detected. This

allows on screen display without phase Jitter in

research mode of the tuner

- Automatic VCR mode recognition for time con-

stant switching

- Frame safety input

WORKING DESCRIPTION

Synchronization Separator

Line synchronization separator is clamped to black

level of input video signal with synchronization

pulse bottom level measurement.

The synchronization pulses are divided centrally

between the black level and the synchronization

pulse bottom level, to improve performance on

video signal in noise conditions.

2/8

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