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TDA4455 - Multistandard VIF Amplifier and PLL Demodulator

Description

This multistandard video IF processing circuit with PLL picture carrier regeneration gives a high performance of linear video demodulation.

2 and Pins 17

18), it is possible to select between two signal sources.

Features

  • D Suitable for standard B/G, L and D2MAC, processes negative and positive modulated IF-signals with equal polarity of the output signal D Standard L: fast AGC acting on peak white level with average value controlled capacitor discharge and reference hysteresis D Two IF-inputs, for switching between two signal sources (e. g. , two tuners and two SAW-filters) D D2MAC: fast AGC acting on peak level with controlled capacitor discharge D Output for delayed tuner-AGC, take over point adjustable D H.

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Datasheet Details

Part number TDA4455
Manufacturer TEMIC Semiconductors
File Size 158.85 KB
Description Multistandard VIF Amplifier and PLL Demodulator
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Full PDF Text Transcription

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TELEFUNKEN Semiconductors TDA4455 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 picture carrier regeneration gives a high performance of linear video demodulation. With two IF inputs (Pins 1–2 and Pins 17–18), it is possible to select between two signal sources. The input selector switch (Pin 16) works independent from the standard switch (Pin 11). The IF signal is internally fed via a 3-stage controlled wideband amplifier to the video demodulator and 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.
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