XRT83L30 Datasheet, PDF (31/78 Pages) Exar Corporation – SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT83L30
ONE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
PRELIMINARY
REV. P1.3.0
TABLE 7: RECEIVE TERMINATIONS
RXTSEL TERSEL1 TERSEL0 RXRES1 RXRES0
R_ext
0
x
x
x
x
R_ext
1
0
0
0
0
∞
R_int
∞
100Ω
MODE
T1/E1/J1
T1
1
0
1
0
0
∞
110Ω
J1
1
1
0
0
0
∞
75Ω
E1
1
1
1
0
0
∞
120Ω
E1
1
0
0
0
1
240Ω
172Ω
T1
1
0
1
0
1
240Ω
204Ω
J1
1
1
0
0
1
240Ω
108Ω
E1
1
1
1
0
1
240Ω
240Ω
E1
1
0
0
1
0
210Ω
192Ω
T1
1
0
1
1
0
210Ω
232Ω
J1
1
1
0
1
0
210Ω
116Ω
E1
1
1
1
1
0
210Ω
280Ω
E1
1
0
0
1
1
150Ω
300Ω
T1
1
0
1
1
1
150Ω
412Ω
J1
1
1
0
1
1
150Ω
150Ω
E1
1
1
1
1
1
150Ω
600Ω
E1
Figure 14 is a simplified diagram for T1 (100Ω) in the external receive termination mode. Figure 15 is a
simplified diagram for E1 (75Ω) in the external receive termination mode.
FIGURE 14. SIMPLIFIED DIAGRAM FOR T1 IN THE EXTERNAL TERMINATION MODE (RXTSEL= 0)
XRT83L30 LIU
TTIP
3.1Ω
TRING
RTIP
3.1Ω
100Ω
RRING
1:2 or
1:2.45
1:1
100Ω
100Ω
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