TDA9817; TDA9818

General description

The TDA9817 is an integrated circuit for single standard vision IF signal processing and FM demodulation.

The TDA9818 is an integrated circuit for multistandard vision IF signal processing, sound AM and FM demodulation.

Features

• 5 V supply voltage
• Applicable for Intermediate Frequencies (IFs) of 38.9, 45.75 and 58.75 MHz
• Gain controlled wide band Video IF (VIF) amplifier (AC-coupled)
• True synchronous demodulation with active carrier regeneration (very linear demodulation, good intermodulation figures, reduced harmonics and excellent pulse response)
• Robustness for over-modulation better than 105pct due to gated phase detector at L/L accent standard and PLL-bandwidth control at negative modulated standards
• Voltage Controlled Oscillator (VCO) frequency switchable between L and L accent (alignment external) picture carrier frequency
• VIF Automatic Gain Control (AGC) detector for gain control, operating as peak sync detector for B/G, peak white detector for L; signal controlled reaction time for L
• Tuner AGC with adjustable TakeOver Point (TOP)
• Automatic Frequency Control (AFC) detector without extra reference circuit
• AC-coupled limiter amplifier for sound intercarrier signal
• Alignment-free FM Phase-Locked Loop (PLL) demodulator with high linearity
• Sound IF (SIF) input for single reference Quasi Split Sound (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 and in intercarrier mode
• AM demodulator without extra reference circuit
• Stabilizer circuit for ripple rejection and to achieve constant output signals
• ElectroStatic Discharge (ESD) protection for all pins.

Block diagrams/pinning

Design support

Application Notes

AN97047_1; DVB-IF downconverter for set top boxes with AGC and VIF/SIF-demodulator: TDA9819 (09-Dec-97)

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