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STA326 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
Manufacturer
STA326 Datasheet PDF : 43 Pages
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STA326
7.1 CONFIGURATION REGISTER A (Address 00h)
D7
D6
D5
D4
D3
FDRB
TWAB
TFRB
IR1
IR0
0
1
1
0
0
D2
MCS2
0
D1
MCS1
1
D0
MCS0
1
7.1.1 Master Clock Select
BIT
R/W
RST
0
R/W
1
1
R/W
1
2
R/W
0
NAME
MCS0
MCS1
MCS2
DESCRIPTION
Master Clock Select: Selects the ratio between the input
I2S sample frequency and the input clock.
The STA326 will support sample rates of 32kHz, 44.1kHz, 48Khz, 88.2kHz, and 96kHz. Therefore the
internal clock will be:
32.768Mhz for 32kHz
45.1584Mhz for 44.1khz, 88.2kHz, and 176.4kHz
49.152Mhz for 48kHz, 96kHz, and 192kHz
The external clock frequency provided to the XTI pin must be a multiple of the input sample frequency (fs).
The correlation between the input clock and the input sample rate is determined by the status of the MCSx
bits and the IR (Input Rate) register bits. The MCSx bits determine the PLL factor generating the internal
clock and the IR bit determines the oversampling ratio used internally.
Table 7. IR and MCS Settings for Input Sample Rate and Clock Rate
Input Sample Rate
fs (kHz)
32, 44.1, 48
88.2, 96
176.4, 192
IR
000
00
768fs
01
384fs
1X
384fs
001
512fs
256fs
256fs
MCS(2..0)
010
384fs
192fs
192fs
011
256fs
128fs
128fs
100
128fs
64fs
64fs
101
576fs
x
x
7.1.2 Interpolation Ratio Select
BIT
R/W
RST
4...3
R/W
00
NAME
IR (1...0)
DESCRIPTION
Interpolation Ratio Select: Selects internal interpolation ratio based
on input I2S sample frequency
The STA326 has variable interpolation (re-sampling) settings such that internal processing and DDX out-
put rates remain consistent. The first processing block interpolates by either 2 times or 1 time (pass-
through) or provides a down-sample by a factor of 2.
The IR bits determine the re-sampling ratio of this interpolation.
Table 8. IR bit settings as a function of Input Sample Rate
Input Sample Rate Fs (kHz)
32
44.1
48
88.2
96
176.4
192
IR (1,0)
00
00
00
01
01
10
10
1st Stage Interpolation Ratio
2 times over-sampling
2 times over-sampling
2 times over-sampling
Pass-Through
Pass-Through
Down-sampling by 2
Down-sampling by 2
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