le79555 Zarlink Semiconductor, le79555 Datasheet - Page 17

• Manufacturer Part Number: le79555
• Description: Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

APPLICATION CIRCUITS
Note:
1.
2.
Please consult Legerity representatives for details about the secondary protector.
For CHCLK operation between 190 kHz and 290 kHz, L1 is recommended to be 2 mH. For CHCLK operation between 290 kHz and 600
kHz, L1 is recommended to be 1 mH.
B (RING)
A (TIP)
BAT
RING_SOURCE
0.47 µF
RS
560 pF
RS
R
50 Ω
C
C
FA
CH2
FIL
RINGOUT
U2
RYOUT1
RYOUT2
0.47 µF
R
50 Ω
N/C
FB
Secondary
C
Protector
V1
0.33 µF
R
400 Ω
SR
C
15 nF
R
1.3 kΩ
L
1mH
C
D
MUR120
1
CH1
CH
DA
DB
QB
CHCLK1
2.2 nF
2.2 nF
C
C
BX
AX
220 nF
D
MUR120
C
VBH
HP
R
909 kΩ
R
1.0 M Ω
SR1
SR3
BGND
L
DA
DB
A(TIP)
HPA
HPB
B(RING)
RINGOUT
RYOUT1
RYOUT2
RSVD
QBAT
VBAT
CHS
VREG
Zarlink Semiconductor Inc.
Le79555
R
1.0 MΩ
R
909 kΩ
SR2
SR4
U1
17
C
330 nF
C
330 nF
SR1
SR2
CHCLK
AGND
VCC
RSN
CAS
DET
VTX
RDC
VDC
RD
D2
D1
C3
C2
C1
DB
DA
13 kΩ
35.7 k Ω
R
DC2
R
D
+5 VA
125 kΩ
13 kΩ
R
R
C
330 nF
Clock
220 nF
CHCLK
C
CD1 #1
C7 #1
C6 #1
C5 #1
C4 #1
C3 #1
TX1
DC1
DC
CAS
VDC
124 kΩ
R
15 nF
C
RX
D
100 nF
100 nF
C
C
OUT
IN
ANALOG
GROUND
BATTERY
GROUND
VOUT #1
VIN #1