SM5844 Просмотр технического описания (PDF) - Nippon Precision Circuits

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SM5844

Asynchronous Sample Rate Converter

Nippon Precision Circuits  

NIPPON PRECISION CIRCUITS LTD.

SM5844AF

Asynchronous Sample Rate Converter

OVERVIEW

The SM5844AF is a digital audio signal,

asynchronous sample rate converter LSI. It reads 16

or 20-bit word length input data, and writes 16, 18,

or 20-bit word length output data. It also features a

built-in digital deemphasis filter and digital

attenuator.

The SM5844AF operates from a 5 V supply, and is

available in 44-pin QFPs.

APPLICATIONS

s Digital audio equipment, sample rate conversion

(audiovisual amplifiers, CD-R, DAT, MD and 8

mm VTRs)

s Commercial recording/editing equipment, sample

rate conversion

s Input data jitter elimination

PINOUT

FEATURES

Functions

s Left/right-channel processing (stereo)

s Input sample rate (fsi) ranges

• 24 to 48 kHz (256fsi mode)

• 27 to 55 kHz (384fsi mode)

s Output sample rate (fso) range

• 20 to 100 kHz

s Sample rate conversion ratio (fso/fsi)

• 0.5 to 2.0 times

s Asynchronous input and output timing (clock

inputs)

s System clock inputs (input and output clocks

independent)

• 256fsi or 384fsi input system clock

• 256fso or 384fso output system clock

s Deemphasis filter

• IIR-type filter

• 44.1, 48 or 32 kHz

s Digital attenuator

• 11-bit data for 1025 levels

• Smooth, incremental attenuation change

• +12 dB gain shift function

s Direct mute function

s Through mode operation

• Input to output direct

s Output data clocks (LRCO, BCKO)

• External input (slave mode)

• Output system clock generated internally

(master mode)

s CMOS-level input/outputs

s 5 V (standard) single supply

s 44-pin QFP

s Molybdenum-gate CMOS process

DI

BCKI

LRCI

ICLK

ICKSL

IFM1

IFM2

VSS

RSTN

TST2N

TST1N

STATE

IISN

OW20N

PACKAGE DIMENSIONS

Unit: mm

44-pin QFP

12.80 +- 0.30

10.00

0.60+- 0.20

0.80

0.35+- 0.10

NIPPON PRECISION CIRCUITS—1

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