CF5008A1 View Datasheet(PDF) - Nippon Precision Circuits
Part Name
Description
Manufacturer
CF5008A1 Datasheet PDF : 10 Pages
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CF5008A1
VARICAP (Variable Capacitance Diodes) SELECTION
The CF5008A1 forms a VCXO with addition of an external varicap (variable capacitance diode) device. This
section examines the results using various varicap devices. When the equivalent circuit in figure 1 is used, the
load capacitance CL must be changed by a factor of 4 to 5 (10 to 40pF) to affect a ±100ppm frequency change.
Varicap devices that can change the capacitance by a factor of 5 require a maximum capacitance in the range
approximately 20 to 50pF. Devices matching this criteria are listed in the following table.
L
Ca
R
4.08673mH 7.56439fF 17.7068Ω
Company
HITA C H I
HITA C H I
HITA C H I
HITA C H I
HITA C H I
Panasonic
Panasonic
Panasonic
TOKO
TOKO
Cb
2.05389pF
Frequency:28.633MHz
C L:20pF
Figure 1. Crystal oscillator element equivalent circuit
Product
HVU17
HVU359
HVU362
HVC374B
HVC375B
MA304
MA2S304
MA2ZV05
KV1811E
KV1812
Capacitance 1
50.0 to 85.0pF (VR = 1V)
24.8 to 29.8pF (VR = 1V)
41.6 to 49.9pF (VR = 1V)
21.5 to 24.0pF (VR = 1V)
15.5 to 17.0pF (VR = 1V)
24.8 to 29.8pF (VR = 1V)
24.8 to 29.8pF (VR = 1V)
18.5 to 20.5pF (VR = 1V)
21.5pF typ (VR = 1V)
16.0pF typ (VR = 1V)
Capacitance 2
5.23 to 8.84pF (VR = 4.5V)
6.00 to 8.30pF (VR = 4V)
10.1 to 14.8pF (VR = 4V)
12.5 to 14.5pF (VR = 2V)
4.0pF typ (VR = 4V)
6.00 to 8.30pF (VR = 4V)
6.00 to 8.30pF (VR = 4V)
3.60 to 4.10pF (VR = 4V)
4.00pF typ (VR = 4V)
3.00pF typ (VR = 4V)
NIPPON PRECISION CIRCUITS—7
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