ISL5586 Intersil Corporation, ISL5586 Datasheet - Page 16

• Manufacturer Part Number: ISL5586
• Description: Low Power Ringing SLIC
• Manufacturer: Intersil Corporation

Equations 48 and 60 can be combined to re-write the 4-wire
to 4-wire gain equation.
------------------- -
V
V
TX4W
R X4W
V
=
V
2W
IN
+
-
–
2.8
Z
+
-
L



I
Z
L
----------------------------------------- -
Z
L
O
IL
V
+ 2R
R
TR
R
P2
P1
Z
L
P
R
R
P2
P1
+ Z
RING
TIP
4-16
T
R
L



×
FIGURE 13. SCHEMATIC FOR 2-WIRE TO 4-WIRE GAIN DERIVATION
FIGURE 14. SCHEMATIC FOR 4-WIRE TO 4-WIRE GAIN DERIVATION
Z
------
Z
0
L
20
20
20
20
200K
200K
200K
200K
+
+
+
+
-
-
-
-
4R
4R
4R
4R
4R
4R
4R
4R
(EQ. 61)
1:1
1:1
-
+
-
+
3R
3R
3R
3R
V
V
SA
T
SA
T
A
A
8K
8K
200K
200K
200K
200K
Simplifying the above yields the 4-wire to 4-wire gain.
------------------- -
V
V
TX4W
R X4W
V
V
V
V
RX
ZO
ZO
RX
R
-IN
V
R
-IN
V
C
C
FB
S
S
FB
FB
=
FB
1.4R
1.4R
+
-
+
–
-
2.8
1.4R
1.4R



----------------------------------------- -
Z
R
O
R
+ 2R
R
R
R
R
Z
0
P
-
+
-
+
V
V
R
R
+ Z
RXP
RXM
V
V
L
RXM
RXP



+
-
V
RX4W
V
V
V
V
V
V
TXP
TX4W
TXP
TXM
TX4W
TXM
+
-
+
-
(EQ. 62)