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STA003T Datasheet(PDF) 18 Page - STMicroelectronics

Part # STA003T
Description  MPEG 2.5 LAYER III AUDIO DECODER
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA003T Datasheet(HTML) 18 Page - STMicroelectronics

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DRA
Address: 0x48
Type: R/W
Software Reset: 0X00
Hardware Reset: 0X00
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
Description
DRA7
DRA6
DRA5
DRA4
DRA3
DRA2
DRA1
DRA0
OUTPUT ATTENUATION
000
0000
0
NO ATTENUATION
000
0000
1
-1dB
000
0001
0
-2dB
:::
::::
:
:
011
0000
0
-96dB
DRA register is used to attenuate the level of
audio output at the Right Channel using the but-
terfly shown in Fig. 11. When the register is set to
255
(0xFF),
the
maximum
attenuation
is
achieved.
A decimal unit correspond to an attenuation step
of 1 dB.
DRB
Address: 0x49
Type: R/W
Software Reset: 0xFF
Hardware Reset: 0xFF
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
Description
DRB7
DRB6
DRB5
DRB4
DRB3
DRB2
DRB1
DRB0
OUTPUT ATTENUATION
000
0000
0
NO ATTENUATION
000
0000
1
-1dB
000
0001
0
-2dB
:::
::::
:
:
011
0000
0
-96dB
DRB register is used to re-direct the Right Chan-
nel on the Left, or to mix both the Channels.
Default value is 0x00, corresponding at the maxi-
mum attenuation in the re-direction channel.
PCMDIVIDER
Address: 0x54
Type: RW
Software Reset: 0x01
Hardware Reset: 0x01
76
543
210
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
PCMDIVIDER is used to set the frequency ratio
between the OCLK (Oversampling Clock for
DACs), and the SCKT (Serial Audio Transmitter
Clock).
The relation is the following:
SCKT_freq
=
OCLK_freq
2
(1 + PCMDIVIDER)
STA003T
18/32



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