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STA529 bảng dữ liệu(PDF) 23 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  FFX™ audio codec with analog and digital inputs and 2 x 1.2 W (or 2 x 100 mW HP) class-D amplifier
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STA529 bảng dữ liệu(HTML) 23 Page - STMicroelectronics

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STA529
PLL
Doc ID 13095 Rev 3
23/57
When automatic settings are not used, the PLL must be configured to generate an internal
frequency, fPHI, of N * fs, where fs is the frequency of pin LRCLKI. Values for N are given in
Table 15.
Example 1
fXTI = 13 MHz and fs = 44.1 kHz
IDF should be equal to 3 otherwise LDF becomes less than 8 (FRAC_CTRL must be 1):
LDF = floor(45.1584 / (13 / IDF)) = 10
FRACT = round([(45.1584 / (13 / IDF)) - floor(45.1584 / (13 / IDF))] * 216) = 27602.
where:
floor means rounded down and
round means rounded to nearest integer.
Using the above configuration, the system clock is 45.15841675 MHz, the approximate
static error is 16 Hz (that is, 0.5 ppm).
Example 2
fXTI = 19.2 MHz and fs = 48 kHz
IDF should be equal to 4 otherwise LDF become less than 8 (FRAC_CTRL must be 1):
LDF = floor(49.152 / (19.2 / IDF)) = 10
FRACT = round([(49.152 / (19.2 / IDF)) - floor(49.152 / (19.2 / IDF))] * 216) = 15728.
Using the above configuration, the system clock is 49.151953125 MHz, the approximate
static error is 47 Hz (that is, 1 ppm).
Table 15.
Oversampling table
fs (kHz)
N
fPHI (MHz)
8
4096
32.768
11.025
4096
45.1584
12
4096
49.152
16
2048
32.768
22.05
2048
45.1584
24
2048
49.152
32
1024
32.768
44.1
1024
45.1584
48
1024
49.152
64
512
32.768
88.2
512
45.1584
96
512
49.152
128
256
32.768
176.4
256
45.1584
192
256
49.152



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