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STA015 Datasheet(PDF) 8 Page - STMicroelectronics

Part # STA015
Description  MPEG 2.5 LAYER III AUDIO DECODER WITH ADPCM CAPABILITY
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA015 Datasheet(HTML) 8 Page - STMicroelectronics

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R
C
C
XTI2DSPCLK
XTI2OCLK
X
S
N
M
PFD
CP
VCO
Switching
Circuit
OCLK
DCLK
Update FRAC
FRAC
XTI
Disable PLL
Figure 5. PLL and Clocks Generation System
2.4 - PCM Output Interface
The decoded audio data are output in serial PCM
format. The interface consists of the following sig-
nals:
SDO
PCM Serial Data Output
SCKT
PCM Serial Clock Output
LRCLK
Left/Right Channel Selection Clock
The output samples precision is selectable from
16 to 24 bits/word, by setting the output precision
with PCMCONF (16, 18, 20 and 24 bits mode)
register. Data can be output either with the most
significant bit first (MS) or least significant bit first
(LS), selected by writing into a flag of the
PCMCONF register.
Figure 8 gives a description of the several
STA015 PCM Output Formats.
The sample rates set decoded by STA015 is de-
scribed in Table 1.
LRCKT
SDO
SDO
PCM_FORMAT = 0
PCM_DIFF = 0
PCM_FORMAT = 1
PCM_DIFF = 1
32 SCLK Cycles
32 SCLK Cycles
32 SCLK Cycles
32 SCLK Cycles
32 SCLK Cycles
M
S
M
S
L
S
L
S
L
S
L
S
M
S
M
S
M
S
L
S
M
S
L
S
L
S
L
S
M
S
M
S
LRCKT
SDO
SDO
PCM_ORD = 1
PCM_PREC is 16 bit mode
PCM_ORD = 0
PCM_PREC is 16 bit mode
16 SCLK Cycles
16 SCLK Cycles
16 SCLK Cycles
16 SCLK Cycles
16 SCLK Cycles
M
S
M
S
L
S
L
S
L
S
L
S
M
S
M
S
M
S
L
S
M
S
L
S
L
S
L
S
M
S
M
S
SDO
PCM_FORMAT = 0
PCM_DIFF = 1
L
S
L
S
M
S
M
S
M
S
L
S
L
S
M
S
SDO
PCM_FORMAT = 1
PCM_DIFF = 1
L
S
L
S
M
S
M
S
M
S
L
S
L
S
M
S
0
0
0
0
0
0
0
0
00
00
0
00
0
MSB
MSB
MSB
MSB
Figure 6. PCM Output Formats
Table 1: MPEG Sampling Rates (KHz)
MPEG 1
MPEG 2
MPEG 2.5
48
24
12
44.1
22.05
11.025
32
16
8
STA015-STA015B-STA015T
8/44


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