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參數(shù)資料
| 型號(hào)： | AM7953X-1DC |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Subscriber Line Interface Circuit |
| 中文描述： | 用戶線接口電路 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 266K |
| 代理商： | AM7953X-1DC |
16
Am7953X Data Sheet
TEST CIRCUITS
I
L2-4
=
–
20 log (V
TX
/ V
AB
)
A. Two- to Four-Wire Insertion Loss
V
AB
R
L
2
R
L
2
A(TIP)
B(RING)
VTX
RSN
AGND
SLIC
V
AB
A(TIP)
B(RING)
VTX
RSN
AGND
SLIC
R
L
I
L4-2
=
–
20 log (V
AB
/ V
RX
)
BRS = 20 log (V
TX
/ V
RX
)
B. Four- to Two-Wire Insertion Loss and Balance Return Signal
R
T
R
T
R
RX
R
RX
V
RX
V
L
V
AB
A(TIP)
B(RING)
VTX
RSN
AGND
SLIC
V
L
S2 Open, S1 Closed:
L-T Long. Bal. = 20 log (V
AB
/ V
L
)
L-4 Long. Bal. = 20 log (V
TX
/ V
L
)
S2 Closed, S1 Open:
4-L Long. Sig. Gen. = 20 log (V
L
/ V
RX
)
C. Longitudinal Balance
R
T
R
RX
V
RX
S2
R
L
2
R
L
2
S1
V
L
C
Note:
Z
D
is the desired impedance (e.g., the
characteristic impedance of the line).
R
L
=
–
20 log (2 V
M
/ V
S
)
V
M
A(TIP)
B(RING)
VTX
RSN
AGND
SLIC
R
T
R
RX
V
S
900
R
R
Z
IN
D. Two-Wire Return Loss Test Circuit
1
ω
C
<< R
L
I
DC
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