PBL 3762A/2, /4
Ref
fig
Parameter
Conditions
Min
Typ
Max
Unit
Two-wire return loss, r
|ZTR + ZL|
|ZTR - ZL|
r = 20 • Log
ZTR ≈ ZL = nom. 600 Ω
0.2 kHz ≤ f ≤ 0.5 kHz
0.5 kHz ≤ f ≤ 1.0 kHz
1.0 kHz ≤ f ≤ 3.4 kHz, Note 3
25
27
23
dB
dB
dB
V
V
V
TIPX idle voltage, VTi
3762A/2, active, IL = 0
3762A/4, active, IL = 0
stand-by, IL = 0
- 3
-1.5
0.6
RINGX idle voltage, VRi
3762A/2, active, IL = 0
3762A/4, active, IL = 0
stand-by, IL = 0
- 45
- 46.5
- 48
V
V
V
TIPX-RINGX open loop
metallic voltage, VTR
3762A/2, IL = 0, RSG = 20 kΩ
3762A/4, IL = 0, RSG = 0 Ω, VBat= -52V 43.0
42.0
45.0
V
V
47.0
Four-wire transmit port (VTX)
Overload level, VTXO
5
Load impedance > 20 kΩ,
1% THD, Note 4
3.1
VPeak
Output offset voltage, ∆VTX
0°C ≤ TAmb ≤ 70°C
-40°C ≤ TAmb ≤ 85°C
0.2 kHz ≤ f ≤ 3.4 kHz
-30
-40
30
40
20
mV
mV
Ω
Output impedance, zTX
<5
Four-wire receive port (RSN)
Receive summing node (RSN) dc voltage
Receive summing node (RSN) impedance
Receive summing node (RSN)
current (IRSN) to metallic loop current (IL)
gain, αRSN
I
RSN = 0 mA
0
<10
1000
V
Ω
ratio
0.2 kHz ≤ f ≤ 3.4 kHz
0.3 kHz ≤ f ≤ 3.4 kHz
20
Frequency response
Two-wire to four-wire, g2-4
6
0.3 kHz ≤ f ≤ 3.4 kHz
relative to 0 dBm, 1.0 kHz. ERX = 0 V
0°C ≤ TAmb ≤ 70°C
-0.13
-0.20
0.13
0.20
dB
dB
-40°C ≤ TAmb ≤ 85°C
Figure 4. Metallic to longitudinal and
four-wire to longitudinal balance
C
TIPX
5
VTX
21
R
L
1
V
I
R
<< 150 Ω, RLT = RLR = 300 Ω
ωC
TXO
Ldc
T
PBL 3762A/2
RINGX
6
RSN
19
E
L
RT = 600 kΩ, RRX = 300 kΩ
R
RX
Figure 5. Overload level, VTXO, four-wire
transmit port
C
TIPX
5
VTX
21
R
L
L
1
V
<< RL, RL = 600 Ω
ωC
V
R
I
TX
TR
T
Ldc
PBL 3762A/2
E
RX
RINGX
6
RSN
19
E
RT = 600 kΩ, RRX = 300 kΩ
R
RX
4
ERICSSON [ ERICSSON ]
