參數(shù)資料
型號(hào)： STA323WTR
廠商： 意法半導(dǎo)體
英文描述： 2.1 HIGH EFFICIENCY DIGITAL AUDIO SYSTEM
中文描述： 2.1高效率數(shù)字音頻系統(tǒng)
文件頁(yè)數(shù)： 12/41頁(yè)
文件大?。?/td> 749K
代理商： STA323WTR
STA323W
12/41
7.1 CONFIGURATION REGISTER A (Address 00h)
7.1.1 Master Clock Select
The STA323W 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
7.1.2 Interpolation Ratio Select
The STA323W has variable interpolation (re-sampling) settings such that internal processing and DDX
output 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
D7
D6
D5
D4
IR1
0
D3
IR0
0
D2
D1
D0
FDRB
0
TWAB
1
TFRB
1
MCS2
0
MCS1
1
MCS0
1
BIT
0
R/W
R/W
RST
1
NAME
MCS0
DESCRIPTION
Master Clock Select: Selects the ratio between the input
I
2
S sample frequency and the input clock.
1
2
R/W
R/W
1
0
MCS1
MCS2
Input Sample Rate
fs
(kHz)
IR
MCS(2..0)
000
768fs
384fs
384fs
001
512fs
256fs
256fs
010
384fs
192fs
192fs
011
256fs
128fs
128fs
100
128fs
64fs
64fs
101
576fs
x
x
32, 44.1, 48
88.2, 96
176.4, 192
00
01
1X
BIT
4...3
R/W
R/W
RST
00
NAME
IR (1...0)
DESCRIPTION
Interpolation Ratio Select: Selects internal interpolation ratio based
on input I
2
S sample frequency
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
1
st
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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