74hct4046a NXP Semiconductors, 74hct4046a Datasheet - Page 21

• Manufacturer Part Number: 74hct4046a
• Description: Phase-locked-loop With Vco
• Manufacturer: NXP Semiconductors

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To obtain optimum temperature stability, C1 must be as small as possible but larger than 100 pF.
Fig.18 Frequency stability of the VCO as a function of ambient temperature with supply voltage as a parameter.
5
0
5
50
In (b), the frequency stability for R1 = R2 = 10 k at 5 V is also given (curve A). This curve is set by the total VCO bias current, and is
not simply the addition of the two 10 k stability curves. C1 = 100 pF; V
0
with offset
without offset (R2 = ): (a) R1 = 3 k ; (b) R1 = 10 k ; (c) R1 = 300 k .
(a)
50
V
CC
=
(R1 = ): (a) R2 = 3 k ; (b) R2 = 10 k ; (c) R2 = 300 k .
6 V
100
5 V
T amb (
3 V
4.5 V
3 V
MSB710
5 V
6 V
o
C)
150
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5
0
5
50
0
(b)
5 V
6 V
50
3 V
VCO IN
100
T
amb
V
CC
= 0.5 V
MSB711
3 V
5 V
6 V
( C)
A
=
o
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CC
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5
0
5
50
0
(c)
50
6 V
V
5 V
CC
3 V
=
100
T
amb
MSB712
5 V
6 V
3 V
( C)
o
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