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SM5902 Datenblatt(PDF) 1 Page - Nippon Precision Circuits Inc

Teilenummer SM5902
Bauteilbeschribung  compression and non compression type shock-proof memory controller
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Hersteller  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

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NIPPON PRECISION CIRCUITS INC.
NIPPON PRECISION CIRCUITS-1
SM5902AF
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
⋅ 4 external DRAM configurations selectable
1
× 16M DRAM (4M × 4 bits, refresh cycle =
2048 cycle)
1
× or 2 × 4M DRAM (1M × 4 bits)
1
× 1M DRAM (256k × 4 bits)
⋅ DRAM at 5V operation is usable for Low-volt-
age operation
- 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 5 extension I/O pins
- +2.4 to +5.5 V wide 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 SM5902 is a compression and non compres-
sion type shock-proof memory controller LSI for
compact disc players. The compression level can
be set in 4 levels, and external memory can be
selected from 4 options (1M, 4M, 4M
× 2, 16M).
Digital attenuator, soft mute and related functions
are also incorporated. It operates from a 2.4 to 5.5
V wide supply voltage range.
Features
Ordering Information
SM5902AF
44pin QFP


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