74HCT9046AN Philips, 74HCT9046AN Datasheet - Page 10

• Manufacturer Part Number: 74HCT9046AN
• Description: PLL with bandgap controlled VCO
• Manufacturer: Philips

Philips Semiconductors
1999 Jan 11
PLL with bandgap controlled VCO
a. At every
b. Comparable voltage-controlled switch.
Two kinds of transfer functions may be regarded:
a. The current transfer:
b. The voltage transfer; this transfer can be observed at PC2
V
DEMOUT
I P
I P
0
2
=
, even at zero
V
PC2OUT
=
pump current
approximately 15 ns
=
pulse overlap of
PCIN
------ -
4
0
a.
5
both switches are closed simultaneously for a short period (typically 15 ns).
PCIN
PCIN
up
down
-------
2
I
P
Fig.8 The current switch charge pump output of PC2.
a.
I P
I P
PCIN
2
PC2 OUT
V CC
V DEMOUT(AV)
MBD046 - 1
Fig.9 Phase comparator 2.
C2
OUT
1/2V
by connecting a resistor (R = 10 k ) between PC2
V
CC
CC
0
2
10
0
b.
down
up
PCIN
MSB306 - 1
V CC
2
OUT
R3'
I
b.
I P
P
PCIN =
x R
and
74HCT9046A
1
2
V
Product specification
CC
SIGIN
C2
;
PC2 OUT
VC2 OUT
MBD099
COMPIN