參數(shù)資料
型號(hào): XRT83VSH38IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA225
封裝: 19 X 19 MM, 1 MM PITCH, PLASTIC, BGA-225
文件頁(yè)數(shù): 22/76頁(yè)
文件大?。?/td> 722K
代理商: XRT83VSH38IB
XRT83VSH38
19
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.7
2.0
MASTER CLOCK GENERATOR
Using external clock sources, the on-chip frequency synthesizer generates the T1 (1.544MHz) or E1
(2.048MHz) master clocks necessary for the transmit pulse shaping and receive clock recovery circuit. There
are two master clock inputs MCLKE1 and MCLKT1. In systems where both T1 and E1 master clocks are
available these clocks can be connected to the respective pins. All channels of a given XRT83VSH38 must be
operated at the same clock rate, either T1, E1 or J1 modes. In systems that have only one master clock
source available (E1 or T1), that clock should be connected to both MCLKE1 and MCLKT1 inputs for proper
operation.
F
IGURE
3. T
WO
I
NPUT
C
LOCK
S
OURCE
F
IGURE
4. O
NE
I
NPUT
C
LOCK
S
OURCE
T
ABLE
2: M
ASTER
C
LOCK
G
ENERATOR
MCLKE1
K
H
Z
MCLKT1
K
H
Z
CLKSEL2
CLKSEL1
CLKSEL0
MCLKRATE
M
ASTER
C
LOCK
K
H
Z
2048
2048
0
0
0
0
2048
2048
2048
0
0
0
1
1544
2048
1544
0
0
0
0
2048
1544
1544
0
0
1
1
1544
1544
1544
0
0
1
0
2048
2048
1544
0
0
1
1
1544
MCLKE1
MCLKT1
MCLKOUT
1.544MHz
or
2.048MHz
2.048MHz
+/-50ppm
1.544MHz
+/-50ppm
Two Input Clock Sources
MCLKE1
MCLKT1
MCLKOUT
1.544MHz
or
2.048MHz
One Input Clock Source
Input Clock Options
1.544kHz
2.048kHz
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