Digital TV sound demodulator/decoder
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.