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參數(shù)資料
| 型號： | FS6209-01 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CAP 0.022UF 25V 10% X7R SMD-0603 TR-7-PA 5K/REEL |
| 中文描述： | 雙鎖相環(huán)壓控時鐘發(fā)生器IC |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 113K |
| 代理商： | FS6209-01 |
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February 1999
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Table 2: Pin Descriptions
Key: AI = Analog Input; AO = Analog Output; DI = Digital Input; DI
U
= Input with Internal Pull-Up; DI
D
= Input with Internal Pull-Down; DIO = Digital Input/Output; DI-3 = Three-Level Digital Input,
DO = Digital Output; P = Power/Ground; # = Active Low pin
PIN
TYPE
NAME
DESCRIPTION
1
AI
XIN
VCXO Feedback
2
P
VDD
Power Supply (+3.3V)
3
AI
XTUNE
VCXO Tune
4
P
VSS
Ground
5
DO
CLKA
Clock Output A
6
DO
CLKB
Clock Output B
7
DO
VSS
Ground
8
AO
XOUT
VCXO Drive
3.0 Functional Block Description
3.1
The on-chip PLLs are a standard frequency- and phase-
locked loop architecture. The PLL multiplies the reference
oscillator to the desired frequency by a ratio of integers.
The frequency multiplication is exact with a zero synthe-
sis error.
Phase-Locked Loop (PLL)
3.2
Voltage-Controlled Crystal
Oscillator (VCXO)
The VCXO provides a tunable, low-jitter frequency refer-
ence for the rest of the FS6209 system components.
Loading capacitance for the crystal is internal to the
FS6209. No external components (other than the reso-
nator itself) are required for operation of the VCXO.
Continuous fine-tuning of the VCXO frequency is accom-
plished by varying the voltage on the XTUNE pin. The
total change (from one extreme to the other) in effective
loading capacitance is t.b.d. nominal.
The oscillator operates the crystal resonator in the paral-
lel-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.
Specifically, the motional capacitance of the crystal (usu-
ally referred to by crystal manufacturers as C
1
), the static
capacitance of the crystal (C
0
), and the load capacitance
(C
L
) of the oscillator determine the warping capability of
the crystal in the oscillator circuit.
A simple formula to obtain the warping capability of a
crystal oscillator is:
×
=
(
+
)
(
) (
×
)
C
C
C
C
C
C
C
×
ppm
f
L
L
L
L
1
0
2
0
6
1
2
1
2
10
+
)
(
×
where C
L1
and C
L2
are the two extremes of the applied
load capacitance.
EXAMPLE: A crystal with the following parameters is
used. With C
1
= 0.02pF, C
0
= 5pF, C
L1
= 10pF, and C
L2
=
22.66pF, the coarse tuning range is
(
(
) (
.
66
22
5
2
×
+
×
)
5
)
ppm
.
.
f
305
10
106
+
10
66
22
02
0
=
×
×
=
.
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