SAA2520 查看數據表（PDF） - Philips Electronics

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SAA2520

Stereo filter and codec for MPEG layer 1 audio applications

Philips Electronics 

Philips Semiconductors

Stereo filter and codec for MPEG layer 1

audio applications

Preliminary specification

SAA2520

FEATURES

• Stereo filtering and codec functions in a single chip

• MPEG coded interface

• Filtered data interface

• Baseband audio data interface

• LT interface to microcontroller

• Clock generator

• Low operating voltage capability.

GENERAL DESCRIPTION

The SAA2520 performs the sub-band filtering and audio

frame codec functions to provide efficient audio

compression/decompression for MPEG (11172-3) Layer1

applications. It is capable of functioning as a stand-alone

decoder but requires the addition of an adaptive masking

threshold processor (SAA2521) in order to function as a

highly efficient encoder.

ORDERING INFORMATION

EXTENDED TYPE

NUMBER

SAA2520GP(1)

PINS

44

Note

1. SOT205-1; 1996 August 26.

PIN POSITION

QFP

PACKAGE

MATERIAL

plastic

CODE

SOT205AG

CLK24 X22OUT X24OUT

handbook, full pagewidth CLK22

X22IN

X24IN

V DD

38 39 40 41 42 43

28,44

1

FS256

7

SBDIR

11

SBEF

CLOCK GENERATOR

STEREO

SUB-BAND

FILTER

PROCESSOR

SAA2520

CODEC

SUB-BAND

SERIAL

INTERFACE

8

SBDA

9

SBCL

10

SBWS

12

SBMCLK

2

MUTEDAC

3

DEEMDAC

4

ATTDAC

SWS

SCL

SDA

20

19

BASEBAND

SERIAL

21 INTERFACE

FILTERED

DATA

INTERFACE

MICROPROCESSOR

INTERFACE & CONTROL

5,37

VSS

18 17 16 15 14 13 36 35 34 33 32 22 29 6

FDAF

FRESET SYNCDAI LTCNT0 LTCLK PWRDWN URDA

FDAC

FSYNC

FDIR

LTCNT1

LTENA LTDATA RESET

MLB125

August 1993

Fig.1 Block diagram.

2

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