am79574 Advanced Micro Devices, am79574 Datasheet - Page 14

• Manufacturer Part Number: am79574
• Description: Subscriber Line Interface Circuit
• Manufacturer: Advanced Micro Devices

TEST CIRCUITS
14
1/ C << R
R
V
R
2
2
L
L
L
S1
V
L
A. Two- to Four-Wire Insertion Loss
C
L
4-L Long. Sig. Gen. = 20 log (V
V
I
AB
L2-4
L-T Long. Bal. = 20 log (V
L-4 Long. Bal. = 20 log (V
C. Longitudinal Balance
V
R
R
L
2
= –20 log (V
A(TIP)
B(RING)
2
L
L
S2 Open, S1 Closed:
S2 Closed, S1 Open:
SLIC
A(TIP)
B(RING)
AGND
RSN
VTX
SLIC
TX
AGND
/ V
RSN
VTX
AB
)
AB
TX
L
/ V
/ V
/V
L
RX
L
)
S2
)
R
R
R
)
T
RX
Am79574 Data Sheet
T
V
RX
R
RX
B. Four- to Two-Wire Insertion Loss and Balance Return Signal
V
AB
V
S
Note:
Z
characteristic impedance of the line).
R
D
R
R
L
R
D. Two-Wire Return Loss Test Circuit
is the desired impedance (e.g., the
= –20 log (2 V
L
900
V
I
BRS = 20 log (V
L4-2
M
Z
A(TIP)
B (RING)
IN
= –20 log (V
IDC
SLIC
M
AGND
/ V
RSN
VTX
S
A(TIP)
B(RING)
)
TX
AB
SLIC
AGND
/ V
/ V
RSN
VTX
RX
RX
)
)
R
RX
R
R
T
R
T
V
RX
RX