參數(shù)資料
型號: XRT83L314IB
廠商: Exar Corporation
文件頁數(shù): 13/84頁
文件大?。?/td> 0K
描述: IC LIU T1/E1/J1 14CH 304TBGA
標(biāo)準(zhǔn)包裝: 27
類型: 線路接口裝置(LIU)
驅(qū)動(dòng)器/接收器數(shù): 14/14
規(guī)程: T1,E1,J1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 304-LBGA
供應(yīng)商設(shè)備封裝: 304-TBGA(31x31)
包裝: 托盤
XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
16
2.1.2
CASE 2: Internal Termination With One External Fixed Resistor for All Modes
Along with the internal termination, a high precision external fixed resistor can be used to optimize the return
loss. This external resistor can be used for all modes of operation ensuring one bill of materials. There are
three resistor values that can be used by setting the RxRES[1:0] bits in the appropriate channel register.
Selecting the value for the external fixed resistor is shown in Table 3.
By default, RxRES[1:0] is set to "None" for no external fixed resistor. If an external fixed resistor is used, the
XRT83L314 uses the parallel combination of the external fixed resistor and the internal termination as the input
impedance. See Figure 5 for a typical connection diagram using the external fixed resistor.
NOTE: Without the external resistor, the XRT83L314 meets all return loss specifications. This mode was created to add
flexibility for optimizing return loss by using a high precision external resistor.
FIGURE 5. TYPICAL CONNECTION DIAGRAM USING ONE EXTERNAL FIXED RESISTOR
TABLE 3: SELECTING THE VALUE OF THE EXTERNAL FIXED RESISTOR
RXRES[1:0]
EXTERNAL FIXED RESISTOR
0h (00)
None
1h (01)
240
2h (10)
210
3h (11)
150
R
TIP
R
RING
XRT83L314 LIU
1:1
Internal Impedance
Line Interface T1/E1/J1
R
R=240
, 210, or 150
Receiver
Input
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