SAA2520 Datasheet, PDF (2/36 Pages) NXP Semiconductors – Stereo filter and codec for MPEG layer 1 audio applications

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