Insertion Loss and Four-to-Four-Wire Balance Return Signal
(See Figure 5 and Figure 6.)
Description
Gain accuracy, 4- to 2-wire
Gain accuracy, 2- to 4-wire
4- to 4- wire
Gain accuracy, 4- to 2-wire
Gain accuracy, 2- to 4-wire
4- to 4-wire
Gain accuracy over frequency
Gain tracking
Gain tracking
OHT state, on hook
Group delay
300 to 3400 Hz
relative to 1 kHz
+3 to –55 dBm
relative to 0 dBm
0 to –37 dBm
+3 to 0 dBm
0 dBm, 1kHz
0° to +70° C
–40° to +85° C
0° to +70° C
–40° to +85° C
0° to +70° C
–40° to +85° C
–0.10
–0.15
–0.10
–0.15
–0.10
–0.15
–0.35
3
+0.10
+0.15
+0.10
+0.15
+0.10
+0.15
+0.35
µs
3
1, 4, 6
3, 4
dB
OHT state, on hook
OHT state, on hook
–0.35
–6.37
0
–6.02
+0.35
–5.77
3
Test Conditions (See Note 1)
0 dBm, 1 kHz
0 dBm, 1 kHz
Min
–0.20
–6.22
Typ
0
–6.02
Max
+0.20
–5.82
Unit
Note
Line Characteristics
Description
I
L
, Loop-current accuracy, Active
state
I
L
, Long Loops, Active state
Test Conditions (See Note 1)
I
L
in constant-current region
R
LDC
= 600
Ω,
RSGL = open
R
LDC
= 1250
Ω,
RSGL = short,
Bat2 =
−35
V
Active, A and B to ground
OHT, A and B to ground
R
L
= 0
R
L
= 0
B to ground
A to
−48
V = 7 kΩ,
B to ground = 100
Ω
OHT state, RSGH = short, RSGL =
open
I
L
= Resistive feed region
−7.5
42.8
−60
26
−5
+60
V
Min
0.915 I
L
20
20
61
43
100
200
µA
mA
4
8
10
I
L
1.2I
L
mA
18
16
27
27
39
4
72
4
Typ
I
L
21.7
mA
Max
1.085I
L
Unit
Note
I
L
LIM
I
L
, Loop current, Open Circuit state
I
A
, Pin A leakage, Tip Open state
I
B
, Pin B current, Tip Open state
VA, Standby, ground-start signaling
V
AB
, Open Circuit voltage
V
B
, Open Circuit, Standby state
I
L
, Accuracy, Standby state
54
-
I
L
=
----------------------
,
Vbat
<
–
62
R
L
+ 400
I
L
= constant-current region
T
A
= 25
°
C
T
A
= –40° to +85° C
0.8I
L
Power Supply Rejection Ratio, Active Normal State
(V
RIPPLE
= 100 mVrms)
Description
V
CC
V
NEG
V
BAT1
V
BAT2
Test Conditions (See Note 1)
50 to 3400 Hz
50 to 3400 Hz
50 to 3400 Hz
50 to 3400 Hz
Min
33
30
30
30
Typ
50
40
50
50
dB
5
Max
Unit
Note
8
Le79R101 Data Sheet
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