CXD2724AQ-3

CXD2724AQ-3 Single-Chip Dolby Pro Logic Surround Decoder Description The CXD2724AQ-3 is a CMOS LSI developed for Dolby Pro Logic Surround. A SRAM for short delay and AD/DA converters are built in, and all functions necessary for Dolby Pro Logic Surround such as an adaptive matrix, a passive decoder including BNR, auto input balance, a noise sequencer and center channel mode control are contained on a single chip. Further, this LSI also supports Dolby 3 Stereo and Virtual Dolby Surround. Features Dolby Pro Logic Surround decoding with a single chip 2-channel 1-bit AD converter, decimation filter and prefilter operational amplifier 4-channel 1-bit DA converter, oversampling filter and post filter Analog switch for DSP bypass Analog electronic attenuator (+1.5 to –29.5dB) for center/surround channel trim 24K-bit SRAM for short delay No separation or other variance for digital processing External parts reduced by incorporating analog circuits Functions Adaptive matrix Center channel mode control (Normal/Phantom/Wide) Dolby 3 Stereo Auto input balance control (ON/OFF) Noise sequencer Variable delay time (0 to 34.8ms) 7 kHz low-pass filter (12dB/Oct) Modified Dolby B-type NR Simple SFC function Virtual Dolby Surround SFC mode DSP bypass mode (L, R-channel through) Structure Silicon gate CMOS Applications Equipment having Dolby Pro Logic Surround function such as AV amplifiers, receivers and compact music systems 80 pin QFP (Plastic) Absolute...