参数资料
型号: HCT9046
厂商: NXP Semiconductors N.V.
英文描述: PLL with bandgap controlled VCO
中文描述: 锁相环控制VCO的带隙
文件页数: 10/40页
文件大小: 240K
代理商: HCT9046
1999 Jan 11
10
Philips Semiconductors
Product specification
PLL with bandgap controlled VCO
74HCT9046A
MBD099
R3'
IP
up
down
C2
VCC
PC2OUT
VC2OUT
Fig.8 The current switch charge pump output of PC2.
b.
a.
MBD046 - 1
PC2OUT
C2
VCC
IP
IP
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
2
0
1/2V
0
V
VDEMOUT(AV)
CC
CC
π
Φ
PCIN
2
π
IP
Φ
PCIN=
Φ
SIGIN
Φ
COMPIN
2
0
π
Φ
PCIN
2
π
IP
IP
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 PC2
OUT
by connecting a resistor (R = 10 k
) between PC2
OUT
and
1
2
V
CC
;
5
4
π
pump current
I
P
2
π
-------
Φ
PCIN
V
DEMOUT
V
PC2OUT
------
Φ
PCIN
=
=
b.
a.
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