SM5901AF

Overview

The SM5901 is a compression and non compression type anti-shock memory controller with built-in 1M DRAM LSI for compact disc players. The compression level can be set in 4 levels, and external 1M DRAM can be connected to expand the memory to 2M bits. Digital attenuator, soft mute and related functions are also incorporated. It operates from a 2.7 to 3.3 V wide supply voltage range.

Features

- 2-channel processing
- Serial data input
• 2s complement, 16-bit/MSB first, rear-packed format
- System clock input
• 384fs (16.9344 MHz)
- Anti-shock 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 0.70 s/Mbit
• External memory can be connected
2×1M DRAM (256K×4 bits)
Internal and external 1M DRAMs
1×1M DRAM (256K×4 bits)
Only internal 1M DRAM
- Compression mode selectable
- Microcontroller interface
• Serial command write and state read-out
• Data residual quantity detector: 15-bit operation, 16-bit output
• Digital attenuator Full-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
- +2.7 to +3.3 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
- 44-pin QFP package (0.8 mm pin pitch)