le79r70 Zarlink Semiconductor, le79r70 Datasheet - Page 16

• Manufacturer Part Number: le79r70
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

TEST CIRCUITS (continued)
R
100 kHz to 30 MHz
L
80% Amplitude
= 600
Modulated
1.5 Vrms
GEN
Ω
HF
V
S
Z
D
E. Loop-Detector Switching
: The desired impedance;
e.g., the characteristic impedance of the line
A(TIP)
B(RING)
50 Ω
V
CC
R
R
Return loss = –20 log (2 V
DET
6.2 kΩ
E1
L
L
Z
1
2
D. Two-Wire Return Loss Test Circuit
D
V
M
Zarlink Semiconductor Inc.
G. RFI Test Circuit
Z
IN
15 pF
16
200 Ω
200 Ω
M
A(TIP)
B(RING)
/ V
S
SLIC
)
C
C
2
1
AGND
RSN
VTX
RF
RF
50 Ω
50 Ω
RG
2
1
F. Ground-Key Switching
R
R
T1
T2
C
33 nF
C
33 nF
AX
B(RING)
A(TIP)
BX
R
RX
C
A
under test
B
T1
SLIC
VTX