参数资料
型号: XRT83SH38IB
厂商: Exar Corporation
文件页数: 17/78页
文件大小: 0K
描述: IC LIU SH T1/E1/J1 8CH 225BGA
标准包装: 84
类型: 线路接口装置(LIU)
驱动器/接收器数: 8/8
规程: T1,E1,J1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 225-BGA
供应商设备封装: 225-BGA(19x19)
包装: 托盘
XRT83SH38
21
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.7
3.0 RECEIVE PATH LINE INTERFACE
The receive path of the XRT83SH38 LIU consists of 8 independent T1/E1/J1 receivers. The following section
describes the complete receive path from RTIP/RRING inputs to RCLK/RPOS/RNEG outputs. A simplified
block diagram of the receive path is shown in Figure 5.
FIGURE 5. SIMPLIFIED BLOCK DIAGRAM OF THE RECEIVE PATH
3.1
Line Termination (RTIP/RRING)
3.1.1
CASE 1: Internal Termination
The input stage of the receive path accepts standard T1/E1/J1 twisted pair or E1 coaxial cable inputs through
RTIP and RRING. The physical interface is optimized by placing the terminating impedance inside the LIU.
This allows one bill of materials for all modes of operation reducing the number of external components
necessary in system design. The receive termination impedance is selected by programming TERSEL[1:0] to
match the line impedance. Selecting the internal impedance is shown in Table 3.
16
x
0
1
0
2048
16
x
0
1
1544
56
x
1
0
2048
56
x
1
0
1
1544
64
x
1
0
1
0
2048
64
x
1
0
1
1544
128
x
1
0
2048
128
x
1
0
1
1544
256
x
1
0
2048
256
x
1
1544
TABLE 3: SELECTING THE INTERNAL IMPEDANCE
TERSEL[1:0]
RECEIVE TERMINATION
0h (00)
100
1h (01)
110
2h (10)
75
3h (11)
120
TABLE 2: MASTER CLOCK GENERATOR
MCLKE1
K
HZ
MCLKT1
K
HZ
CLKSEL2
CLKSEL1
CLKSEL0
MCLKRATE
MASTER CLOCK
K
HZ
HDB3/B8ZS
Decoder
Rx Jitter
Attenuator
Clock & Data
Recovery
Peak Detector
& Slicer
RTIP
RRING
RCLK
RNEG
RPOS
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