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| 型號： | 844S012BKI-01LF |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | OTHER CLOCK GENERATOR, QCC56 |
| 封裝： | 8 X 8 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-220VLLD-2, VFQFN-56 |
| 文件頁數(shù)： | 8/23頁 |
| 文件大?。?/td> | 847K |
| 代理商： | 844S012BKI-01LF |
ICS844S012BKI-01 REVISION A APRIL 2, 2010
16
2010 Integrated Device Technology, Inc.
ICS844S012I-01 Data Sheet
CRYSTAL-TO-LVDS/LVCMOS FREQUENCY SYNTHESIZER
Schematic Example
Figure 6 shows an example of ICS844S012I-01 application
schematic. In this example, the device is operated at VDD = VDDOB =
VDDOC = VDDO_REF = 3.3V. The 18pF parallel resonant 25MHz
crystal is used. The C1 and C2 = 18pF and are recommended for
frequency accuracy. For different board layouts, the C1 and C2 may
be slightly adjusted for optimizing frequency accuracy. Two examples
of LVDS terminations and one example of an LVCMOS termination
are shown in this schematic. The decoupling capacitors should be
located as close as possible to the power pin.
Figure 6. ICS844S012I-01 Schematic Example
R1
35
QB0
VDD
VDDO
VDD
VDD=3.3V
+
-
Zo = 50 Ohm
R6
100
Zo = 50 Ohm
REF_OE
BYPASS
Alternate
LVDS
Termination
XTAL_OUT
XTAL_IN
REF_SEL
Logic Control Input Examples
Set Logic
Input to
'0'
Set Logic
Input to
'1'
To Logic
Input
pins
To Logic
Input
pins
Zo = 50 Ohm
+
-
R7
50
Note: This device requires a
reset signal at nMR after
power-up to function
properly.
VDDOC=3.3V
VDDOB=3.3V
LVDS Termination
LVCMOS
QA1
nQA1
QA0
R5
43
Ro ~ 7 Ohm
Q1
Driv er_LVCMOS
Zo = 50 Ohm
REF_IN
VDD
Zo = 50
LVCMOS
Zo = 50
R3
30
REF_OUT1
REF_OUT0
VDDO
nMR
RU2
Not Install
RU1
1K
RD2
1K
RD1
Not Install
VDD
VDDO
F_
S
E
LB
1
F_
S
E
LC
2
F_
S
E
LB
0
F_
S
E
LC
1
F_
S
E
LC
0
F_
S
E
LA
0
QA
_OE
F_
S
E
LA
1
C4
0.01u
VDD
C5
10u
R4
10
VDD
SS
C
0
F_
S
E
LB
2
SS
C
1
VDDA
nQA0
VDDO
VDD
(U1, 29)
R8
50
C8
0.1uF
nQA1
QA1
(U1, 28)
(U1, 52)
(U1, 48)
(U1, 7)
(U1, 14)
(U1, 56)
(U1, 42)
(U1, 43)
VDDA
C11
0.1u
C12
0.1u
C16
0.1u
R2
10
C3
0.1u
VDDO_REF
C14
0.1u
C13
0.1u
C10
0.1u
X1
25MHz, CL=18pF
C17
0.1u
C7
0.01u
U1
VDDO_REF
1
REF_OUT0
2
REF_OUT1
3
GND
4
GND
5
REF_IN
6
VDD
7
REF_SEL
8
XTAL_IN
9
XTAL_OUT
10
BYPASS
11
REF_OE
12
nMR
13
VDD
14
GN
D
15
SS
C
1
16
SS
C
0
17
F_
S
E
LB
2
18
F_
S
E
LB
1
19
F_
S
E
LB
0
20
F_
S
E
LC
2
21
F_
S
E
LC
1
22
F_
S
E
LC
0
23
F_
S
E
LA
1
24
GND
35
GND
34
QA0
33
nQA0
32
QA1
31
VD
D
28
GN
D
27
QA
_OE
26
F_
S
E
LA
0
25
V
DDO
B
52
QB
4
51
GN
D
50
V
DDO
B
48
QB
2
47
GN
D
46
QB
1
45
QB
0
44
V
DDO
B
43
VDDA
37
GND
36
QB
5
53
GN
D
54
QB
6
55
QB
3
49
nQA1
30
VDD
29
VDDA
38
VDDOC
42
QC
41
GND
40
QBC_OE
39
V
DDO
B
56
C15
0.1u
C2
18pF
C1
18pF
C9
0.1u
C6
10u
nQA0
QA0
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