LXT350 — T1/E1 Short Haul Transceiver with Crystal-less Jitter Attenuation
Figure 12. Typical T1/E1 LXT350 Hardware Mode Application
2.048 MHz/
1.544 MHz
TAOS
LLOOP
RLOOP
EC1
MCLK
From
CMOS
Control
Logic
TCLK
TPOS
TNEG
TCLK
TPOS
TNEG
EC2
EC3
MODE
TRSTE
T1/E1
Framer
JASEL
TTIP
RCLK
RCLK
RPOS
RNEG
1:21
Rt1
RPOS
RNEG
LXT350
1
CL
Rt1
TRING
RTIP
LOS
NLOOP
TVCC
2
RL
VCC
RRING
0.1
µ
F
68 µF
1:1
TGND
GND
NOTES:
1. See Table 18 and Table 19 for CL, Rt and Transformer selection.
2. RL = 100 Ω for T1
RL = 120 Ω for E1/120 Ω twisted pair
RL = 75 Ω for E1/75 Ω coax
4.4.2
Host Mode Application
Figure 13 shows a typical application using the LXT350 in Host mode. See Table 18 through Table
19 to select the transformers (T1 and T2), resistors (Rt and RL) and capacitors (CL) needed for this
application.
Note: If the application includes surge protection, such as a varistor or sidactor on the TTIP/TRING lines,
it may also require reducing the value of the capacitor CL, or eliminating it completely. Excessive
capacitance at CL will distort the transmitted signals.
36
Datasheet
ETC [ ETC ]
