參數(shù)資料
型號: AD9877
廠商: Analog Devices, Inc.
英文描述: Mixed-Signal Front End Set-Top Box, Cable Modem
中文描述: 混合信號前端機頂盒,電纜調(diào)制解調(diào)器
文件頁數(shù): 15/36頁
文件大?。?/td> 1094K
代理商: AD9877
AD9877
PROGRAMMABLE CLOCK OUTPUT REFCLK
The AD9877 provides a frequency-programmable clock output
REFCLK (Pin 71). OSCIN or MCLK (
f
MCLK
) and the master
clock divider ratio R stored in Register Address 0x01 determine
its frequency.
Rev. B | Page 15 of 36
f
OSCOUT
=
f
MCLK
/
R
or
f
OSCIN
In its default setting (0x00 in Register 0x01), the REFCLK pin
provides a buffered output of
f
OSCIN
.
3
T
3
T
3
D
3
D
3
P
3
P
3
R
3
D
3
D
4
D
4
S
4
C
4
S
4
S
2
DRGND
DRVDD
3
4
(MSB) IF(11)
7
IF(8)
IF(7)
IF(6)
6
IF(9)
5
IF(10)
1
AVDD
8
9
10
IF(5)
IF(4)
12
IF(3)
IF(2)
IF(1)
IF(0)
13
14
15
16
(MSB) RxIQ(3)
RxIQ(2)
RxIQ(1)
RxIQ(0)
RxSYNC
DRGND
DRVDD
17
18
19
20
21
22
23
MCLK
DVDD
DGND
24
25
26
TxSYNC
27
(MSB) TxIQ(5)
TxIQ(4)
TxIQ(3)
TxIQ(2)
28
29
30
11
79
I IN+
I IN–
78
77
AGNDIQ
NC
74
AGNDIQ
AVDDIQ
DRVDD
75
NC
76
80
AGNDIQ
73
72
71
REFCLK
DRGND
69
DGNDSD
SDELTA0
SDELTA1
DVDDSD
CA_EN
CA_DATA
CA_CLK
DVDDOSC
OSCIN
XTAL
DGNDOSC
AGNDPLL
PLLFILT
AVDDPLL
68
67
66
65
64
63
62
61
60
59
58
57
56
55
DVDDPLL
DGNDPLL
AVDDTx
Tx+
Tx–
54
53
52
51
70
4
D
4
D
4
P
4
R
4
F
5
A
N
A
I
I
A
A
R
R
A
A
N
N
A
A
R
R
A
A
Q
Q
1
9
9
9
9
9
9
9
9
9
9
8
8
8
8
8
8
8
8
8
PIN 1
AD9877
TOP VIEW
(Pins Down)
NC = NO CONNECT
0
C3
0.1
μ
F
C6
0.1
μ
F
C1
0.1
μ
F
C4
0.1
μ
F
CP1
10
μ
F
CP2
10
μ
F
C2
0.1
μ
F
C5
0.1
μ
F
C10
20pF
C11
20pF
GUARD TRACE
R1
C12
0.01
μ
F
1.3k
Ω
C13
0.1
μ
F
R
SET
2k
Ω
Figure 16. Basic Connection Diagram
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