Datasheet > TDA4454

TDA4454

更新时间： 2024-11-27 22:49:55

品牌	Logo	应用领域
TEMIC		放大器
页数	文件大小	规格书
11页	152K
描述
Multistandard VIF Amplifier and PLL Demodulator

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TDA4454 数据手册

TDA4454

TELEFUNKEN Semiconductors

Multistandard VIF Amplifier and PLL Demodulator

Application

Monolithic integrated circuit for vision IF signal processing in multistandard TV and VTR sets.

Description

This multistandard video IF processing circuit with PLL amplified and fed via an interference limiter to the video

picture carrier regeneration gives a high performance of output (Pin 6).

linear video demodulation.

The standard switch also determines the clamp level of

the video amplifier and the required IF-AGC mode. In the

The IF signal is internally fed via a 3-stage controlled

standard B/G mode the sync peak value is the criterion for

wideband amplifier to the video demodulator and the

a fast charge and discharge. In the standard L mode on the

phase detector. The phase detector compares the phase of

IF signal (0°) with the output signal of the VCO (90°) and

sets the VCO frequency accordingly. A lock detector

other hand, fast AGC action is achieved by charging at

peak white level and discharging by the averaged video

signal (time constant on Pin 7). The response level for dis-

switches the PLL loop filter according to the state of the

charge has a hysteresis. In the D2MAC mode a similar

PLL (locked-PLL slow, unlocked-PLL fast).

function is applied to achieve the AGC, but with different

A second output of the VCO (0°) provides the reference

carrier for the video demodulator. The polarity of the

demodulator can be inverted by the standard switch

(Pin 10), so that negative or positive modulated IF signals

threshold levels.

An overload detector prevents the PLL becoming

unlocked by large IF input signals.

are always available with the same polarity at the demo- To achieve a delayed tuner-AGC action, the current

dulator output. The demodulated video signal is filtered, output (Pin 3) can be adjusted with a resistor at Pin 2.

Features

Suitable for standard B/G, L and D2MAC, processes

negative and positive modulated IF-signals with equal

polarity of the output signal

D2MAC: fast AGC acting on peak level with

controlled capacitor discharge

Output for delayed tuner-AGC, take over point

adjustable

High performance video demodulator with PLL

picture carrier regeneration

High input sensitivity

Extended video bandwidth (12 MHz) for the demo-

dulation of amplitude modulated MAC-signals

Ultra white and ultra black limiting

Supply voltage range 6.8 to 13 V

Low power consumption

ESD protection

Standard B/G: AGC acting on the sync peak pulse

Standard L: fast AGC acting on peak white level with

average value controlled capacitor discharge and

reference hysteresis

Package Options

Case: 16-pin DIL plastic

Rev. A1: 04.05.1995

1 (11)

Preliminary Information

12 3 4 5 6 7...11

中文翻译

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与TDA4454相关器件

型号	品牌	获取价格	描述	数据表
TDA4455	TEMIC	获取价格	Multistandard VIF Amplifier and PLL Demodulator
TDA4462AFLG3	VISHAY	获取价格	Analog Circuit,
TDA4470	TEMIC	获取价格	Multistandard Video-IF and Quasi Parallel Sound Processing
TDA4470BFLG3	VISHAY	获取价格	Analog Circuit,
TDA4470BSD	VISHAY	获取价格	Analog Circuit,
TDA4470DFLG3	VISHAY	获取价格	Analog Circuit,
TDA4470-DFLG3	ATMEL	获取价格	Audio/Video Demodulator, AM/FM, Bipolar, PDSO28, SO-28
TDA4470-DSD	ATMEL	获取价格	Audio/Video Demodulator, AM/FM, Bipolar, PDIP28, SDIP-28
TDA4470-DSD	VISHAY	获取价格	Consumer IC, Bipolar, PDIP28,
TDA4470-M	TEMIC	获取价格	Multistandard Video-IF and Quasi Parallel Sound Processing

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