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SM5904CF Datasheet(PDF) 1 Page - Nippon Precision Circuits Inc |
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SM5904CF Datasheet(HTML) 1 Page - Nippon Precision Circuits Inc |
1 / 35 page NIPPON PRECISION CIRCUITS INC. NIPPON PRECISION CIRCUITS-1 SM5904CF compression and non compression type shock-proof memory controller Overview - 2-channel processing - Serial data input ⋅ 2s complement, 16-bit/MSB first, right-justified format - Wide capture function (up to 3 × speed input rate) - System clock input ⋅ 384fs (16.9344 MHz) - Shock-proof memory controller ⋅ ADPCM compression method ⋅ 4-level compression mode selectable 4-bit compression mode 2.78 s/Mbit 5-bit compression mode 2.22 s/Mbit 6-bit compression mode 1.85 s/Mbit Full-bit non compression mode 0.74 s/Mbit ⋅ External DRAM configurations usable 2 × 4M DRAM (1M × 4 bits) Internal and External 4M DRAM 1 × 4M DRAM (1M × 4 bits) Only Internal 4M DRAM - Compression mode selectable - Microcontroller interface ⋅ Serial command write and status read-out ⋅ Data residual detector: 15-bit operation, 16-bit output ⋅ Digital attenuator 8-bit setting ⋅ Soft attenuator function Noiseless attenuation-level switching (256- step switching in 23 ms max.) ⋅ Soft mute function Mute ON in 23 ms max. Direct return after soft mute release ⋅ Forced mute - Extension I/O Microcontroller interface for external control using 4 extension I/O pins - +2.5 to + 3.3 V operating voltage range - Schmitt inputs All input pins (including I/O pins) except CLK (system clock) - Reset signal noise elimination Approximately 3.8 µs or longer (65 system clock pulses) continuous LOW-level reset - Digital audio interface (DIT) - 44-pin QFP package (0.8 mm pin pitch) The SM5904CF is a compression and non com- pression type shock-proof memory controller LSI for compact disc players. The compression level can be set in 4 levels, and external 4M DRAM can be connected to expand the memory to 4M bits. Digital attenuator, soft mute and related functions are also incorporated. It operates from a 2.5 to 3.3 V supply voltage range. Features Ordering Information SM5904CF 44pin QFP |
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