GENERAL DESCRIPTION
The TDA9819 is an integrated circuit for multistandard vision and sound-IF signal processing with single reference PLL demodulator combined with the signal stages for DVB-IF processing.

FEATURES
• 5 V supply voltage
• Applicable for IF frequencies of 38.9 MHz and 45.75 MHz
• Two switched VIF inputs, gain controlled wide band VIF-amplifier (AC-coupled)
• True synchronous demodulation with active carrier regeneration (very linear demodulation, good intermodulation figures, reduced harmonics and excellent pulse response)
• VCO frequency switchable between TV (M or BG/L) IF-picture carrier and Digital Video Broadcast (DVB) frequency
• Separate video amplifier for sound trap buffering with high video bandwidth
• VIF AGC detector for gain control, operating as peak sync detector for M and B/G and peak white detector for L; controlled reaction time for L
• Tuner AGC with adjustable takeover point (TOP)
• AFC detector without extra reference circuit
• SIF input for single reference QSS mode (PLL controlled); SIF AGC detector for gain controlled SIF amplifier; single reference QSS mixer able to operate in high performance single reference QSS mode
• AC-coupled limiter amplifier for sound intercarrier signal
• Alignment-free FM-PLL demodulator with high linearity
• AM demodulator without extra reference circuit
• Stabilizer circuit for ripple rejection and to achieve constant output signals.

DVB functions
• Gain controlled IF-amplifier
• Mixer for DVB-IF
• VCO for QAM carrier recovery
• External VCO control for DVB
• Internal and external AGC for DVB
• DVB output level adjust via AGC adjust
• High level DVB operational output amplifier.