XRT83L34_05 Datasheet, PDF (40/99 Pages) Exar Corporation – QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

XRT83L34
xr
REV. 1.0.1 QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 7: RECEIVE TERMINATIONS
RXTSEL TERSEL1 TERSEL0 RXRES1 RXRES0
R_ext
0
x
x
x
x
R_ext
1
0
0
0
0
∞
1
0
1
0
0
∞
1
1
0
0
0
∞
1
1
1
0
0
∞
R_int
∞
100Ω
110Ω
75Ω
120Ω
MODE
T1/E1/J1
T1
J1
E1
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)
XR T83L34 LIU
T T IP
3.1Ω
T R IN G
R T IP
3.1Ω
100Ω
R R IN G
1:2.45
1:1
100Ω
100Ω
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