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TDA4439

TEMIC Semiconductors
Part Number TDA4439
Manufacturer TEMIC Semiconductors
Description Video IF Amplifier for Multistandard TV and VTR
Published Apr 23, 2005
Detailed Description TELEFUNKEN Semiconductors TDA4439 Video IF Amplifier for Multistandard TV and VTR Technology: Bipolar Features D Stand...
Datasheet PDF File TDA4439 PDF File

TDA4439
TDA4439

Overview
TELEFUNKEN Semiconductors TDA4439 Video IF Amplifier for Multistandard TV and VTR Technology: Bipolar 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 pulses required D Expanded video frequency response allows the demodulation of amplitude modulated MAC signals D The direction of the AFC curve is selectable independently from the standard switch Case: DIP18 Figure 1.
Block diagram Rev.
A1: 14.
09.
1995 1 (7) TDA4439 Pin 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...


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