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TDA4439 Datasheet Video If Amplifier For Multistandard Tv And Vtr

Manufacturer: TEMIC Semiconductors (now Microchip)

Overview: TELEFUNKEN Semiconductors TDA4439 Video IF Amplifier for Multistandard TV and VTR Technology:.

General Description

1 2 3 4 5 6 7 8 95 10840 TELEFUNKEN Semiconductors 16 15 14 13 12 11 10 9 Pin 1, 18 2 3, 17 4 5 6 7 8, 11 9, 10 12 13 14 15 16 Function IF input Standard switch: open B/G ground L Ground IF-AGC storage capacitor AGC (tuner control) Tuner AGC take over Polarity switch: open AFC “DOWN” ground AFC “UP” Demodulator circuit AFC circuit AFC output Average capacitor standard L Video output Supply voltage n.c.

Circuit Description The following function units are integrated in this circuit combination for video-IF processing: – Three symmetric, highly stable, gain controlled wide- – Disconnectable AFC generator with push pull band amplifier, quasi galvanic coupling eliminates current output feed back – High impedance, interference free controlled voltage – Video carrier controlled demodulator of high linearity facilities, best possible AGC time constant with small storage capacitor – Polarity switch over for video and AFC-signal – Controlled discharge circuit for fast gain control – Video output amplifier with low-pass characteristics, limiter for ultra black and inverter for ultra w

Key Features

  • D Standard B/G-L suitable, processes negatively and positively modulated IF-signals with equal polarity of the output signal D High input sensitivity D Fast AGC by controlled discharge of the AGC capacitor Standard L mode: AGC acting on peak white level, capacitor discharge control by averaged video signal Standard B/G: AGC acting on the sync. pulse peak D Ultra white inverter and ultra black limiter for reducing transmission interference D Internally noise protected gain control, no flyback.

TDA4439 Distributor

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