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STA529 bảng dữ liệu(PDF) 20 Page - STMicroelectronics

tên linh kiện STA529
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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PLL
STA529
20/57
Doc ID 13095 Rev 3
6
PLL
Figure 5 shows the main components of the PLL.
Figure 5.
PLL block diagram
6.1
Functional description
Phase/frequency detector
The phase/frequency detector (PFD) compares the phase difference between the
corresponding rising edges of INFIN and FBCLK, (clock output from the loop frequency
divider) by generating voltage pulses with widths proportional to the input phase error.
Charge pump and loop filter
This block converts the voltage pulses from the phase/frequency detector to current pulses
which charge the loop filter and generate the control voltage for the voltage-controlled
oscillator. The loop filter is placed external to the PLL on pin FILT.
Voltage controlled oscillator
The voltage controlled oscillator (VCO) is the oscillator inside the PLL. It produces a
frequency (fVCO) proportional to the input control voltage.
Input frequency
Output
frequency
divider
Loop frequency divider
CLKIN
LOCKP
fVCO
IDF
Lock detect
INFIN
FBCLK
Phase
Buffer
Fractional controller
VCO
INFIN
FBCLK
DITHER_DISABLE
FRAC_INPUT
NDIV
PHI
INFOUT
divider
Charge
REFOUT
LF
FILT
VCONT
pump and
loop filter
STRB
STRB_BYPASS
FRAC_CTRL
frequency
divider
(PFD)



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