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參數(shù)資料
| 型號(hào)： | 11274-502-XTD |
| 元件分類(lèi)： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 28 MHz, PDSO16 |
| 封裝： | 0.150 INCH, GREEN, SOIC-16 |
| 文件頁(yè)數(shù)： | 40/40頁(yè) |
| 文件大小： | 746K |
| 代理商： | 11274-502-XTD |
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9
AMI Semiconductor - Rev. 2.0, Jun. 05
www.amis.com
FS6131-01/FS6131-01g Programmable Line Lock Clock Generator IC
Data Sheet
Figure 11. The oscillator operates the crystal resonator in the parallel-resonant mode. Crystal warping, or the "pulling" of the crystal oscillation
frequency, is accomplished by altering the effective load capacitance presented to the crystal by the oscillator circuit. The actual amount that
changing the load capacitance alters the oscillator frequency will be dependent on the characteristics of the crystal as well as the oscillator circuit
itself.
The motional capacitance of the crystal (usually referred to by crystal manufacturers as C1), the static capacitance of the crystal (C0) and the load
capacitance (CL) of the oscillator determine the warping capability of the crystal in the oscillator circuit. A simple formula to determine the total
warping capability of a crystal is
()
() (
)
C
ppm
f
L
1
0
2
0
6
1
2
1
2
10
)
(
+
+
-
=
D
where CL1 and CL2 are the two extremes of the applied load capacitance obtained from Table 11.
Example: A crystal with the following parameters is used with the FS6131. The total coarse tuning range is:
C1=0.02pF, C0=5.0pF, CL1=10.0pF, CL2=22.66pF
()
() (
)
ppm
.
f
305
10
5
66
22
5
2
10
66
22
02
0
6
=
+
+
-
=
D
4.4.1 VCXO Tuning
The VCXO may be coarse tuned by a programmable adjustment of the crystal load capacitance via the XCT[3:0] control bits. See Table 11 for the
control code and the associated loading capacitance.
The actual amount of frequency warping caused by the tuning capacitance will depend on the crystal used. The VCXO tuning capacitance includes
an external 6pF load capacitance (12pF from the XIN pin to ground and 12pF from the XOUT pin to ground). The fine tuning capability of the
VCXO can be enabled by setting the XLVTEN bit to a one, or disabled by setting it to a zero.
Figure 11 shows the typical effect of the coarse and fine tuning mechanisms. The total coarse tune range is about 350ppm. The difference in
VCXO frequency in parts per million (ppm) is shown as the fine tuning voltage on the XTUNE pin varies from 0V to 5V. Note that as the crystal
load capacitance is increased the VCXO frequency is pulled somewhat less with each coarse step, and the fine tuning range decreases. The fine
tuning range always overlaps a few coarse tuning ranges, eliminating the possibility of holes in the VCXO response. The different crystal warping
characteristics may change the scaling on the Y-axis, but not the overall characteristic of the curves.
VCXO Range (ppm ) vs. XTUNE Voltage (V)
- 200
-150
-100
-50
0
50
100
150
200
01
234
5
67
89 10 11 12 13 14 15
Coarse Tune Setting XCT[3:0]
VCXO
Range
(ppm)
XTUNE Volt age = 0.0V
XTUNE Volt age = 5.0V
Figure 11: VCXO Coarse and Fine Tuning
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