LXT350 — T1/E1 Short Haul Transceiver with Crystal-less Jitter Attenuation
Table 18. Transmit Return Loss (2.048 Mbps)
EC3-1
Xfrmr/Rt
R
L
(
Ω
)
C
L
(pF)
0
75
1:2/
9.1
Ω
000
1:2.3/9.1
Ω
120
470
0
120
470
16
13
13
470
0
16
12
Return Loss
(dB)
14
Table 19. Transmit Return Loss (1.544 Mbps)
EC3-1
Xfrmr/Rt
1:2/
9.1
Ω
011
2
1:1.15
1
/
0.0
Ω
100
470
2
R
L
(
Ω
)
C
L
(pF)
0
100
470
0
17
2
Return Loss
(dB)
16
1. A 1:1.15 transmit transformer keeps the total transceiver
power dissipation at a low level, a 0.47
µ
F DC blocking
capacitor must be placed on TTIP or TRING.
2. Refer to
Table 20. Transformer Specifications
Tx/Rx
Frequency
MHz
Turns Ratio
Primary
Inductance
µ
H
(minimum)
600
600
600
600
Leakage
Inductance
µ
H
(max)
0.80
0.80
0.80
1.10
Interwinding
Capacitance
pF
(max)
60
60
60
60
DCR
Ω
(maximum)
0.90 pri
1.70 sec
0.70 pri
1.20 sec
1.0 pri
1.70 sec
1.10 pri
1.10 sec
Dielectric
1
Breakdown
V
(minimum)
1500 V
RMS
1500 V
RMS2
(3000 V
RMS
)
1500 V
RMS2
(3000 V
RMS
)
1500 V
RMS2
(3000 V
RMS
)
1.544
Tx
2.048
1.544/2.048
Rx
1.544/2.048
1:1.15
1:2.3
1:2
1:1
1. Some ETSI applications may require a 2.3 kV dielectric breakdown voltage.
2. Some applications require transformers to guarantee performance in extended temperature range (-40° to +85° C) ETSI
applications require a dielectric breakdown voltage of 3000 V
RMS
.
34
Datasheet
ETC [ ETC ]
