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参数资料
| 型号： | W671340P |
| 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： | 7/48页 |
| 文件大小： | 1344K |
| 代理商： | W671340P |
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W671300 SERIES
from V1, VSA2 is the voltage resulting from V2 and so on (as shown in the AC signal transmission
model above).
VSA1
3
4
--- V1
(
)
–
=
(EQ. 11)
VSA2
3
4
--- V2
(
)
=
(EQ. 12)
VSA3
3
4
- -- V 3
(
)
=
(EQ. 13)
VSA4
3
4
--- V4
(
)
=
(EQ. 14)
VSA
V2 V1
–
(
)
V4 V3
–
(
)
+
[
]3
4
---
V
V
+
[
]3
4
---
=
(EQ. 15)
Where V is equal to IMRSENSE (RSENSE = 20)
VSA
2
IM
20
×
(
)3
4
---
IM30
=
(EQ. 16)
The voltage at VTX is equal to:
VTX
VIN
RS
RIN
----------
–
VSA
–
RS
8k
--------
VIN
RS
RIN
----------
–
IM30
(
)
–
RS
8k
--------
=
(EQ. 17)
VTR is defined in Figure [4], note polarity assigned to VTR:
VTR
2 VTX
(
)
2 VIN
RS
RIN
----------
IM30
(
)
RS
8k
--------
+
=
(EQ. 18)
Setting VIN equal to zero in the above equation, defining ZO = -VTR/IM and substituting it into the
equation will enable the user to determine the required feedback to match the line impedance at V2W
as shown in the following equation.
ZO
1
133.33
------------------RS
=
(EQ. 19)
7.1.7.1. 2-Wire Impedance Matching
ZO is the source impedance of the device and is defined as:
Publication Release Date: March 2004
- 15 -
Revision 0.5
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