GENERAL DESCRIPTION
The TDA9811 is an integrated circuit for multistandard vision IF signal processing and sound AM, with single reference QSS-IF in TV and VCR sets.

FEATURES
• 5 V supply voltage
• 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, excellent pulse response)
• Robustness for over-modulation better than 105% due to gated phase detector at L/L accent standard
• VCO frequency switchable between L and L accent (alignment external) picture carrier frequency
• Separate video amplifier for sound trap buffering with high video bandwidth
• VIF-AGC detector for gain control, operating as peak sync detector for B/G and peak white detector for L
(optional external AGC); signal 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
• AM demodulator without extra reference circuit
• AM mute (especially for NICAM)
• Stabilizer circuit for ripple rejection and to achieve constant output signals
• ESD protection for all pins.