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.
