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参数资料
| 型号： | W671320P |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 模拟传输电路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 14/48页 |
| 文件大小： | 1344K |
| 代理商： | W671320P |
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W671300 SERIES
The diagram illustrates the phase of the input signal across the device when the signal is applied at
the -IN pin through the RIN resistor. The Transmit Amplifier (TA) inverts the signal 180 degrees at the
VTX pin. The feedback around the tip amplifier inverts the signal again on the tip lead. The input
signal will cause AC loop current to flow through the 20 sense resistors in the direction from V1 to V2
and V3 to V4. This results in an inverted signal (referenced from tip) on the VSA and hence the VFB
pin. This out-of-phase signal is the signal used by the feedback path to match the line impedance of
the 2-wire side.
7.1.8.2. 2-Wire to 4-Wire Phase
AUX
TIP
RING
I
M
V
TX
R
P
R
P
-
+
I
M
+
-
R
+
-
R
SENSE
+ -
V
SA
= I
M 30
I
X
I
X
+
-
I
X
+
-
+
-
+
-
20
20
V
2W
+
-
W671300
V
TX
1:1
+
-
C
FB
VFB
-IN
TA
R
S
8k
3R
4R
I
X
SENSE
RECEIVE BLOCK
V
1
V
2
V
3
V
4
I
M +
-
IM
+
-
R
SENSE
AMPLIFIER
FEED
AMPLIFIER
FEED
V
IN
FROM CODEC
R
IN
2-WIRE SIDE
4-WIRE SIDE
INPUT
AMPLIFIER
FIGURE 7: 2-WIRE TO 4-WIRE SIGNAL PHASE ACROSS THE DEVICE
The diagram above illustrates the phase of the input signal across the device when the signal is
applied across tip and ring. When driving the 2-wire side with a source the device looks like a pre-
determined impedance (programmed with resistor RS). The current flows through the 20 sense
resistors in the direction V2 to V1 and V4 to V3. This results in a non-inverted signal (referenced from
tip) on the VSA and hence the VFB pin. This signal is then inverted by the TA amplifier and the signal
appearing on the VTX putput is out of phase with the signal on tip.
7.1.8.3. Summary
4-Wire to 2-Wire (VIN to V2W) is 180° out of phase.
2-Wire to 4-Wire (V2w to VTX) is 180° out of phase.
4-Wire to 4-Wire (VIN to VTX) is 180° out of phase.
Publication Release Date: March 2004
- 21 -
Revision 0.5
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