74hct9046a NXP Semiconductors, 74hct9046a Datasheet - Page 25

• Manufacturer Part Number: 74hct9046a
• Description: Pll With Bandgap Controlled Vco
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2003 Oct 30
PLL with band gap controlled VCO
Fig.24 Definition of VCO frequency linearity:
R2 = .
f
linearity
c
(MHz)
10
10
(W)
=
P D
Fig.26 Power dissipation as a function of R1.
f
f
-------------- -
f' c
f c
1
1
2
f 2
1
f 1
+
2
0
f
=
2
V = 0.5 V over the V
f
--------------- -
c
4.5 V
C1 = 1 F
5.5 V
C1 = 1 F
f
–
c
V
5.5 V
C1 = 39 pF
f
CC
min
c
4.5 V
C1 = 39 pF
=
100%
100
V
0.5 V CC
CC
200
range.
V
R1 (k )
max
MBD121
V VCO_IN (V)
MGA937 - 1
300
25
R2 =
Fig.25 Frequency linearity as a function of R1, C1
R1 = .
f VCO
(%)
10
(W)
10
P
Fig.27 Power dissipation as a function of R2.
D
4
0
4
8
1
1
2
and V = 0.5 V.
0
1
and V
C1 = 1 F
4.5 V
5.5 V
C1 =
39 pF
4.5 V
5.5 V
5.5 V
C1 = 39 pF
4.5 V
C1 = 39 pF
V
CC
CC
5.5 V
4.5 V
C1 = 1 F
.
=
100
10
200
74HCT9046A
10
Product specification
2
R2 (k )
R1 (k )
MBD110
MBD114
300
10
3