am7945 Advanced Micro Devices, am7945 Datasheet - Page 14

• Manufacturer Part Number: am7945
• Description: Subscriber Line Interface Circuit
• Manufacturer: Advanced Micro Devices

TEST CIRCUITS
14
1
C
R
R
2
2
S1
V
L
L
<< R
V
L
L
4-L Long. Sig. Gen. = 20 log (V
A. Two- to Four-Wire Insertion Loss
L-T Long. Bal. = 20 log (V
L-4 Long. Bal. = 20 log (V
C
L
V
V
AB
S2 Open, S1 Closed
S2 Closed, S1 Open
L
R
R
2
2
I
L2-4
L
L
C. Longitudinal Balance
A(TIP)
B(RING)
V
= 20 log (V
AB
SLIC
A(TIP)
B(RING)
AGND
RSN
VTX
SLIC
TX
AB
TX
/ V
AGND
L
/ V
/ V
RSN
VTX
AB
/ V
L
L
)
)
)
RX
)
R
R
T
RX
Am7945 Data Sheet
S2
R
T
V
R
B. Four- to Two-Wire Insertion Loss and Balance Return Signal
RX
RX
V
AB
V
S
R
Note:
Z
impedance of the line).
R
D
L
L
D. Two-Wire Return Loss Test Circuit
BRS = 20 log (V
is the desired impedance (e.g., the characteristic
I
= –20 log (2 V
L4-2
R
R
Z
V
D
A(TIP)
B(RING)
= 20 log (V
M
Z
IN
SLIC
A(TIP)
B(RING)
M
AGND
RSN
VTX
AB
TX
/ V
/ V
/ V
S
SLIC
)
RX
RX
AGND
)
)
RSN
VTX
R
R
R
T1
T2
R
T
V
RX
RX
R
RX
C
T1