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MAS6283 数据表(PDF) 6 Page - Micro Analog systems

部件名 MAS6283
功能描述  IC FOR 1.5625 MHz ??40.0000 MHz VCXO
PDF  13 Pages
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制造商  MAS [Micro Analog systems]
网页  http://www.mas-oy.com
标志 MAS - Micro Analog systems

MAS6283 数据表(HTML) 6 Page - Micro Analog systems

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DA6283.002
11 November, 2010
6/13
The crystal nominal frequency fNOM_XTAL is calculated, as shown in an equation 4.
Equation 4
∆
+
×
=
6
_
10
1
f
f
f
NOM
XTAL
NOM
Where,
fNOM = Desired nominal frequency of the VCXO module
fNOM_XTAL = Crystal nominal frequency (without MAS IC load capacitance)
Crystal nominal frequency optimization is calculated in an example 2.
Example 2
VCXO module target frequency fNOM is 35 MHz. Crystal characteristics are crystal load CL_XTAL = 12.5 pF and
pulling S = 30 ppm/pF.
MAS6283 CL_IC = 8 pF when VC = 1.65 V.
Calculate load difference ∆CL according to the equation 2.
pF
pF
pF
C
C
C
XTAL
L
IC
L
L
5
.
4
5
.
12
8
_
_
−
=
−
=
−
=
∆
Calculate frequency difference ∆f according to the equation 3.
ppm
pF
ppm
pF
S
C
f
L
135
30
5
.
4
−
=
×
−
=
×
∆
=
∆
Now fNOM = 35 MHz.
According to the equation 4
Hz
f
f
f
NOM
XTAL
NOM
34995275
10
135
1
10
35
10
1
6
6
6
_
=
−
+
×
×
=
∆
+
×
=
The specified crystal has to have a nominal frequency of 34.995275 MHz without load capacitance. This offset is
compensated with 8 pF load capacitance though a crystal CL = 12.5 pF.



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