參數(shù)資料
型號： 935044170112
廠商： NXP SEMICONDUCTORS
元件分類： PLL合成/DDS/VCOs
英文描述： PHASE LOCKED LOOP, PDIP16
封裝： 0.300 INCH, PLASTIC, SOT-38, DIP-16
文件頁數(shù)： 2/40頁
文件大?。?/td> 240K
代理商： 935044170112
1999 Jan 11
10
Philips Semiconductors
Product specication
PLL with bandgap controlled VCO
74HCT9046A
MBD099
R3'
I P
up
down
C2
VCC
PC2 OUT
VC2 OUT
Fig.8 The current switch charge pump output of PC2.
b.
a.
MBD046 - 1
PC2 OUT
C2
VCC
I P
down
up
Φ = Φ
pulse overlap of
approximately 15 ns
PCIN
a. At every
Φ, even at zero Φ both switches are closed simultaneously for a short period (typically 15 ns).
b. Comparable voltage-controlled switch.
0
MSB306 - 1
20
1/2V
0
V
VDEMOUT(AV)
CC
π
Φ PCIN
2
π
I
x R
P
Φ PCIN = Φ SIGIN Φ COMPIN
20
π
Φ PCIN
2
π
I P
Fig.9 Phase comparator 2.
Two kinds of transfer functions may be regarded:
a. The current transfer:
b. The voltage transfer; this transfer can be observed at PC2OUT by connecting a resistor (R = 10 k) between PC2OUT and 12VCC;
pump current
I
P
2
π
-------
Φ
PCIN
V
DEMOUT
V
PC2OUT
5
4
π
-------
Φ
PCIN
==
b.
a.
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