TDA9885T/V3
I2C总线控制的单和多标准对准无中频锁相环解调器 I2C-bus controlled single and multistandard alignment-free IF-PLL demodulators
General description
The TDA9885 is an alignment-free multistandard PAL and NTSC vision and sound IF signal Phase-Locked Loop PLL demodulator for negative modulation only and FM processing.
The TDA9886 is an alignment-free multistandard PAL, SECAM and NTSC vision and sound IF signal PLL demodulator for positive and negative modulation, including sound AM and FM processing.
Features
■ 5 V supply voltage
■ Gain controlled wideband Vision Intermediate Frequency VIF amplifier, AC-coupled
■ Multistandard true synchronous demodulation with active carrier regeneration: very linear demodulation, good intermodulation figures, reduced harmonics, and excellent pulse response
■ Gated phase detector for L and L-accent standard
■ Fully integrated VIF Voltage-Controlled Oscillator VCO, alignment-free, frequencies switchable for all negative and positive modulated standards via I2C-bus
■ Digital acquisition help, VIF frequencies of 33.4 MHz, 33.9 MHz, 38.0 MHz, 38.9 MHz, 45.75 MHz and 58.75 MHz
■ 4 MHz reference frequency input: signal from PLL tuning system or operating as
crystal oscillator
■ VIF Automatic Gain Control AGC detector for gain control, operating as peak sync detector for negative modulated signals and as a peak white detector for positive modulated signals
■ Precise fully digital Automatic Frequency Control AFC detector with 4-bit digital-to-analog converter, AFC bits readable via I2C-bus
■ TakeOver Point TOP adjustable via I2C-bus or alternatively with potentiometer
■ Fully integrated sound carrier trap for 4.5 MHz, 5.5 MHz, 6.0 MHz and 6.5 MHz, controlled by FM-PLL oscillator
■ Sound IF SIF input for single reference Quasi Split Sound QSS mode, PLL controlled
■ SIF AGC for gain controlled SIF amplifier, single reference QSS mixer able to operate in high performance single reference QSS mode and in intercarrier mode, switchable via I2C-bus
■ AM demodulator without extra reference circuit
■ Alignment-free selective FM-PLL demodulator with high linearity and low noise
