描述 Description

GENERAL DESCRIPTION
The TDA9874A is a single-chip Digital TV Sound Demodulator/Decoder (DTVSD) for analog and digital multi-channel sound systems in TV/VCR sets and satellite receivers.FEATURES
? Sound IF (SIF) input switch
? SIF AGC with 24 dB control range
? Switchable 10 dB SIF input attenuator
? SIF 8-bit Analog-to-Digital Converter (ADC)
? Easy TV standard programming option
? Differential Quadrature Phase Shift Keying (DQPSK) demodulation for different standards, simultaneously with 1-channel FM demodulation
? NICAM decoding (B/G, D/K, I and L standard)
? 2-carrier multi-standard FM demodulation (B/G, D/K and M standard)
? Single carrier high deviation FM mono demodulation mode
? Decoding for three analog multi-channel systems (A2) and satellite sound
? Adaptive de-emphasis for satellite
? Programmable identification (B/G, D/K and M standard) and different identification times
? FM pilot carrier presence detector
? Optional AM demodulation for system L, simultaneously with NICAM
? Monitor selection for FM/AM demodulator outputs and FM and NICAM signals with peak option
? Automatic FM dematrixing option
? Digital crossbar switch
? I2S-bus serial audio output with matrix, level adjustment and mute
? Dual audio Digital-to-Analog Converter (DAC) from digital crossbar switch to analog crossbar switch, bandwidth = 15 kHz
? Automatic Volume Level (AVL) control
? Analog crossbar switch with inputs for mono and stereo
? Output selection of mono, stereo, dual, dual A or dual B
? Additional mono output with automatic select
? 20 kHz bandwidth for analog path
? Standby mode
? Automatic output selection for TV applications.

特性 Features

? Sound IF (SIF) input switch
? SIF AGC with 24 dB control range
? Switchable 10 dB SIF input attenuator
? SIF 8-bit Analog-to-Digital Converter (ADC)
? Easy TV standard programming option
? Differential Quadrature Phase Shift Keying (DQPSK) demodulation for different standards, simultaneously with 1-channel FM demodulation
? NICAM decoding (B/G, D/K, I and L standard)
? 2-carrier multi-standard FM demodulation (B/G, D/K and M standard)
? Single carrier high deviation FM mono demodulation mode
? Decoding for three analog multi-channel systems (A2) and satellite sound
? Adaptive de-emphasis for satellite
? Programmable identification (B/G, D/K and M standard) and different identification times
? FM pilot carrier presence detector
? Optional AM demodulation for system L, simultaneously with NICAM
? Monitor selection for FM/AM demodulator outputs and FM and NICAM signals with peak option
? Automatic FM dematrixing option
? Digital crossbar switch
? I2S-bus serial audio output with matrix, level adjustment and mute
? Dual audio Digital-to-Analog Converter (DAC) from digital crossbar switch to analog crossbar switch, bandwidth = 15 kHz
? Automatic Volume Level (AVL) control
? Analog crossbar switch with inputs for mono and stereo
? Output selection of mono, stereo, dual, dual A or dual B
? Additional mono output with automatic select
? 20 kHz bandwidth for analog path
? Standby mode
? Automatic output selection for TV applications.?