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參數(shù)資料
型號: XRT83VL38IB-F
廠商: Exar Corporation
文件頁數(shù): 33/95頁
文件大?。?/td> 0K
描述: IC LIU SH T1/E1/J1 OCTAL 225BGA
標(biāo)準(zhǔn)包裝: 84
類型: 線路接口裝置(LIU)
驅(qū)動器/接收器數(shù): 8/8
規(guī)程: E1
電源電壓: 3.14 V ~ 3.47 V
安裝類型: 表面貼裝
封裝/外殼: 225-BGA
供應(yīng)商設(shè)備封裝: 225-BGA(19x19)
包裝: 托盤
其它名稱: 1016-1481
XRT83VL38IB-F-ND
XRT83VL38
35
REV. 1.0.1
OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TRANSMITTER (CHANNELS 0 - 7)
TRANSMIT TERMINATION MODE
In Hardware mode, TXTSEL (Pin 84) can be tied “High” to select internal termination mode for all transmit
channels or tied “Low” for external termination. Individual channel control can be done only in Host mode. In
Host mode, bit 6 in the appropriate register for a given channel is set “High” to select the internal termination
mode for that specific transmit channel, see Table 24, “Microprocessor Register #1, Bit Description,” on
In internal mode, no external resistors are used. An external capacitor of 0.68
F is used for proper operation of
the internal termination circuitry, see Figure 13.
EXTERNAL TRANSMIT TERMINATION MODE
By default the XRT83VL38 is set for external termination mode at power up or at Hardware reset.
When external transmit termination mode is selected, the internal termination circuitry is disabled. The value of
the external resistors is chosen for a specific application. Figure 14 is a simplified block diagram for T1 (100
)
in the external receive and transmit termination mode. Figure 15 is a simplified block diagram for E1 (75
) in
the external receive termination and internal transmit termination mode.
Table 9 summarizes the transmit terminations.
FIGURE 15. SIMPLIFIED DIAGRAM FOR E1 IN EXTERNAL RECEIVE TERMINATION MODE (RXTSEL= 0)
AND
INTERNAL TRANSMIT TERMINATION MODE (TXTEL= 1)
TABLE 8: TERMINATION SELECT CONTROL
TERSEL1
TERSEL0
TERMINATION
0
100
0
1
110
1
0
75
1
120
TTIP
TRING
RTIP
RRING
75
XRT83VL 38 LIU
75
75
1:2
1:1
0.68uf
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