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SM5904CF Datasheet

  • SM5904CF

  • Nippon Precision Circuits Inc [compression and non compress...

  • NPC

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SM5904CF
NIPPON PRECISION CIRCUITS INC.
compression and non compression type
shock-proof memory controller
Overview
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
- 2-channel processing
- Serial data input
鈰?/div>
2s complement, 16-bit/MSB first, right-justified
format
- Wide capture function
(up to 3
脳
speed input rate)
- System clock input
鈰?/div>
384fs (16.9344 MHz)
- Shock-proof memory controller
鈰?/div>
ADPCM compression method
鈰?/div>
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
鈰?/div>
External DRAM configurations usable
2
脳
4M DRAM (1M
脳
4 bits)
Internal and External 4M DRAM
1
脳
4M DRAM (1M
脳
4 bits)
Only Internal 4M DRAM
- Compression mode selectable
- Microcontroller interface
鈰?/div>
Serial command write and status read-out
鈰?/div>
Data residual detector:
15-bit operation, 16-bit output
鈰?/div>
Digital attenuator
8-bit setting
鈰?/div>
Soft attenuator function
Noiseless attenuation-level switching
(256- step switching in 23 ms max.)
鈰?/div>
Soft mute function
Mute ON in 23 ms max.
Direct return after soft mute release
鈰?/div>
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
碌s
or longer (65 system
clock pulses) continuous LOW-level reset
- Digital audio interface (DIT)
- 44-pin QFP package (0.8 mm pin pitch)
Ordering Information
SM5904CF
44pin QFP
NIPPON PRECISION CIRCUITS-1

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