ds3104 Maxim Integrated Products, Inc., ds3104 Datasheet - Page 25
ds3104
Manufacturer Part Number
ds3104
Description
Ds3104 Line Card Timing Ic With Synchronous Ethernet Support
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS3104.pdf
(136 pages)
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7.7
Both T0 and T4 are digital PLLs with separate analog PLLs (APLLs) as the output stage. This architecture
combines the benefits of both PLL types. See
Figure 7-1. DPLL Block Diagram
Rev: 012108
________________________________________________________________________________________ DS3104-SE
T0 selected
T4 selected
reference
reference
SYNC2K
DPLL Architecture and Configuration
Frequency
Locking
Loop Filter
Loop Filter
PFD and
PFD and
Frequency
Locking
SYNC2K
T0CR1:T4MT0
T4
T0
T4 DPLL
T0 DPLL
0
1
ICRn:FREQ[3:0]
Feedback
ICRn:FREQ[3:0]
Feedback
Foward
Foward
DFS
DFS
T0
T0
DFS
DFS
T4
T4
Figure
MCR7:DIG1SRC
MCR7:DIG2SRC
T0CR1:T4APT0
T0CR1:LKT4T0
FSCR1:2K8KSRC
T0CR1:LKT4T0
T0CR1:LKT4T0
T0CR1:LKT4T0
OUTPUT DFS
7-1.
T0CR1:T0FREQ[2:0]
T4CR1:T4FREQ[3:0]
T0CR1:T0FT4[2:0]
MCR6:DIG1F[1:0]
MCR6:DIG2F[1:0]
FSYNC
APLL2
DIG12
MCR6:DIG1SS
DIG12
MCR6:DIG2SS
MCR6:DIG2AF
APLL
APLL
2K8K
DFS
DFS
DFS
DFS
DFS
DFS
DFS
T4
T0
T0
2
FSCR2:INDEP
Output
Output
Output
PLL Bypass
APLL2
APLL
APLL
T4
T0
T0
2K8K
DIG1
DIG2
2
Dividers
Dividers
Dividers
Output
Output
Output
APLL
APLL
APLL
FSCR1:8KPOL, 2KPOL
FSCR1:8KINV, 2KINV
OCR4:FSEN, MFSEN
OCRm:OFREQn[3:0]
OCR5:AOFn
OC1, OC2,
OC3, OC4,
OC5, OC6,
OC7
FSYNC,
MFSYNC
25 of 136
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