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SM5905AF

NIPPON PRECISION CIRCUITS INC.

compression and non compression type

shock-proof memory controller

Overview

The SM5905AF 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 4.5 to 5.5 V supply

voltage range.

Features

- 2-channel processing

- Serial data input

鈰?/div>

2s complement, 16-bit/MSB first, right-justified

format

鈰?/div>

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

6-bit compression mode 1.85 s/Mbit

8-bit compression mode 1.39 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

- +4.5 to + 5.5 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

SM5905AF

44pin QFP

NIPPON PRECISION CIRCUITS-1

型号

版本

描述

厂商

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SM5905AF Datasheet

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