參數(shù)資料
型號: MC68HC05RC17DW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.097 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 115/128頁
文件大?。?/td> 561K
代理商: MC68HC05RC17DW
MC68HC05RC17 Rev. 2.0
General Release Specification
MOTOROLA
Phase-Locked Loop (PLL) Synthesizer
87
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Release Specification — MC68HC05RC17
Section 10. Phase-Locked Loop (PLL) Synthesizer
10.1 Contents
10.2 Introduction
The phase-locked loop (PLL) consists of a variable bandwidth loop filter,
a voltage controlled oscillator (VCO), a feedback frequency divider, and
a digital phase detector. The PLL requires an external loop filter
capacitor (typically 0.1
F) connected between XFC and V
DDSYN. This
capacitor should be located as close to the chip as possible to minimize
noise. VDDSYN is the supply source for the PLL and should be bypassed
to minimize noise. The VDDSYN bypass cap should be as close as
possible to the chip. VDDSYN should be at the same potential as VDD.
The phase detector compares the frequency and phase of the feedback
frequency (tFB) and the crystal oscillator reference frequency (tREF) and
generates the output, PCOMP, as shown in Figure 10-1. The output
waveform is then integrated and amplified. The resultant dc voltage is
applied to the voltage controlled oscillator. The output of the VCO is
divided by a variable frequency divider of 128, 64, 32, or 16 to provide
the feedback frequency for the phase detector.
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