TDA4439

Features:

· Standard B/G-L suitable, processes negatively and positively modulated IF-signals with equal polarity of
    the output signal
· Ultra white inverter and ultra black limiter for reducing transmission interference
· Internally noise protected gain control, no flyback pulses required
· Expanded video frequency response allows the demodulation of amplitude modulated MAC signals
· High input sensitivity
· 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
· The direction of the AFC curve is selectable independently from the standard switch


Pinout




Specifications

Item	Symbol	Value	Unit
supply voltage                                    Pin 15	VS	10 to 15	V
Supply current                                    Pin 15	IS	75	mA
Open loop voltage                              Pin 5	V5	VS	V
External voltage                                 Pin 4                                                            Pin 14	V4 V14	10 8	V V
Breaking current for VTR operation     Pin 4	I4	0.5	mA
Video output current            max load                                  Pin 14            short circuit max 1 s                 Pin 14	I0	5 50	mA
Power dissipation Tamb 60	Ptot	1.0	W
Junction temperature	Tj	125
Ambient temperature range	Tamb	25 to +70
Storage temperature range	Tstg	25 to +125

Caution: Permanent damage to the chip may result if absolute maximum ratings are exceeded.


Description

The following function units of the TDA4439 are integrated in this circuit combination for video-IF processing:
   Three symmetric, highly stable, gain controlled wideband amplifier, quasi galvanic coupling eliminates feed back
   Video carrier controlled demodulator of high linearity
   Polarity switch over for video and AFC-signal
   Video output amplifier with low-pass characteristics, limiter for ultra black and inverter for ultra
       white  interference
   Disconnectable AFC - generator with push pull current output
   High impedance, interference free controlled voltage facilities, best possible AGC time constant with
      small storage capacitor
   Controlled discharge circuit for fast gain control
   With VTR - operation the video output level is according to the ultra white level in B/G, ultra black level in L