參數(shù)資料
型號(hào): 74HC4046AD/T3
廠商: NXP SEMICONDUCTORS
元件分類: PLL合成/DDS/VCOs
英文描述: PLL FREQUENCY SYNTHESIZER, PDSO16
封裝: SOT-109, SOP-16
文件頁數(shù): 20/34頁
文件大小: 442K
代理商: 74HC4046AD/T3
1997 Nov 25
27
Philips Semiconductors
Product specication
Phase-locked-loop with VCO
74HC/HCT4046A
PLL frequency
capture range
PC1, PC2 or PC3
Loop lter component selection
(a)
τ = R3 x C2 (b) amplitude characteristic (c) pole-zero diagram
A small capture range (2fc) is obtained if
Fig. 27 Simple loop lter for PLL without offset; R3
≥ 500 .
(a)
τ1 = R3 x C2; (b) amplitude characteristic (c) pole-zero diagram
τ2 = R4 x C2;
τ3 = (R3 + R4) x C2
Fig.28 Simple loop lter for PLL with offset; R3 + R4
≥ 500 .
PLL locks on
harmonics at
centre frequency
PC1 or PC3
yes
PC2
no
noise rejection at
signal input
PC1
high
PC2 or PC3
low
AC ripple content
when PLL is
locked
PC1
fr =2fi, large ripple content at φDEMOUT =90°
PC2
fr =fi, small ripple content at φDEMOUT =0°
PC3
fr =fi, large ripple content at φDEMOUT = 180°
SUBJECT
PHASE
COMPARATOR
DESIGN CONSIDERATIONS
2f
c
1
π
--- 2
πf
L τ
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