SM5904BF Ver la hoja de datos (PDF) - Nippon Precision Circuits

Número de pieza

componentes Descripción

Fabricante

SM5904BF

compression and non compression type shock-proof memory controller

Nippon Precision Circuits  

NIPPON PRECISION CIRCUITS INC.

SM5904BF

compression and non compression type

shock-proof memory controller

Overview

The SM5904BF 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 2.4 to 3.3 V supply

voltage range.

Features

- 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

- +2.4 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)

Ordering Information

SM5904BF 44pin QFP

NIPPON PRECISION CIRCUITS-1

Share Link: