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STA529 Arkusz danych(PDF) 19 Page - STMicroelectronics

Numer części STA529
Szczegółowy opis  2 x 100 mW class-D amplifier with analog or digital input 2.0 multichannel digital audio processor with FFX
PDF  58 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA529 Arkusz danych(HTML) 19 Page - STMicroelectronics

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STA529
PLL
19/58
PLL filter
Figure 5 shows the PLL filter scheme. Recommended values are R1 = 12.5 k
Ω,
C1 = 250 pF, and C2 = 82 pF.
Figure 5.
PLL filter scheme
Table 8 on page 13 gives a typical lock time value for the PLL.
5.2
Configuration examples
The STA529 PLL can be configured in two ways:
●
default startup configuration
●
direct PLL programming
The default startup configuration reads the device’s defaults. With this configuration, it is not
necessary to program the PLL dividers directly as some presets are used. In this mode, the
oversampling ratio between pins XTI (or MCLK33) and LRCLKI is fixed to 256.
The direct PLL programming bypasses the automatic presets allowing direct programming
of the PLL dividers.
The output PLL frequency can be determined as following:
Output division factor:
ODF = 2
Relation between input and output clock frequency:
FINFIN = FXTI / IDF
If register bit PLLCFG0.FRAC_CTRL = 1
FVCO = FINFIN * (LDF + FRACT/2
16 + 1/217)
FPHI = FVCO / ODF
When register bit PLLCFG0.DITHER_DISABLE[1] = 1, the 1/217 factor is not in the
multiplication. This is recommended in order to keep register bit
PLLCFG0.DITHER_DISABLE[1] = 0, otherwise there can be spurious signals in the output
clock spectrum.
C2
R1
C1
Vc
Ground



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