Datasheet > TDA5931

TDA5931

更新时间： 2024-11-20 22:49:55

品牌	Logo	应用领域
英飞凌 - INFINEON		放大器
页数	文件大小	规格书
13页	299K
描述
Video IF Amplifier and Demodulator with Full-SCART

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TDA5931 数据手册

Video IF Amplifier and Demodulator

with Full-SCART

TDA 5931-65

Bipolar IC

Features

● Multistandard video IF

● Interference suppression circuitry

● Mean/peak value control

● Area of application: TV set with Full-SCART

P-DIP-18

Type

Ordering Code

Package

TDA 5931-65

Q67000-A5136

P-DIP-18

Functional Description

Video IF for all European standards for positive and negative modulation. The video section

contains a Full-SCART interface. An output for the demodulated video signal (pin 9) allows the

insertion of a sound trap into the signal path to the input or the SCART switch and the SCART output

buffer amplifier (pin 7). The analog setting function (delayed AGC threshold) is controlled via a

potentiometer, all other switch functions are controlled via open-collector transistors.

Circuit Description

The component includes a four-stage, capacitively coupled, symmetrically designed and controlled

amplifier, a limiter with selection, and a mixer for quasi-synchronous demodulation of positive and

negative modulated IF signals. In addition a video output amplifier and noise suppression circuitry

are included. This output is used for generating the AGC voltage. The AGC for both modulation

types has been realized as integral AGC with noise free peak and mean value detector (only for

positive modulation). For SCART applications this output is switched a video source switch with two

inputs (for the demodulator signal or SCART socket) and two outputs (SCART- and TV output). The

demodulator output (pin 9) provides a video signal output level 3 dB higher than the level required

for the operation of the TV set or to drive the SCART connector. Therefore it is possible to insert a

sound trap in between this output and the input of the SCART switch (pin 7). The insertion loss of

the sound trap has to attenuate the signal level at pin 9 by a factor 2/3 or 3 dB (AC and DC) to avoid

distortions in the SCART switch.

The delayed tuner AGC is generated by a threshold amplifier driven by the control voltage. The

amplifier response can be controlled by means of an external potentiometer. (The increase of the

tuner AGC voltage shall create a higher tuner gain = positive control).

Semiconductor Group

06.94

12 3 4 5 6 7...13

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