CXD2728Q

CXD2728Q Single-Chip Dolby Pro Logic Surround Decoder Description The CXD2728Q 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 Modified Dolby B-type NR, 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 and decimation filter 4-channel 1-bit DA converter and oversampling filter 32K-bit SRAM for short delay No separation or other variance for digital processing External parts reduced due to the built-in AD/DA converters 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 46.4ms) 7kHz low-pass filter (12dB/Oct) Modified Dolby B-type NR Simple SFC function Virtual Dolby Surround SFC mode Absolute Maximum Ratings (Ta = 25°C, VSS = 0V) Supply voltage VDD VSS – 0.5 to +4.6 V AVDD ∗1 AVss – 0.5 to + 4.6 V Input voltage VID VSS – 0.5 to VDD + 0.5 V ∗2 Vss – 0.5 to 5 to Min (VDD + 4.6, 7.0) V VIA ∗3 AVss – 0.5 to AVD + 0.5 V Output voltage VOD VSS – 0.5 to VDD + 0.5 V ∗4 Vss – 0.5 to Min (VDD + 4.6, 7.0) V VOA ∗3 AVss – 0.5 to AVDD + 0.5 V St...