描述 Description

GENERAL DESCRIPTION
The TDA9814T is an integrated circuit for multistandard vision IF signal processing and sound AM and dual FM demodulation, with single reference QSS-IF in TV and VCR sets.FEATURES
? 5 V supply voltage
? 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
? AC-coupled limiter amplifier for sound intercarrier signal
? Two alignment-free FM-PLL demodulators with high linearity
? 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
? Stabilizer circuit for ripple rejection and to achieve constant output signals
? ESD protection for all pins.

特性 Features

? 5 V supply voltage
? 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
? AC-coupled limiter amplifier for sound intercarrier signal
? Two alignment-free FM-PLL demodulators with high linearity
? 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
? Stabilizer circuit for ripple rejection and to achieve constant output signals
? ESD protection for all pins.
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