Preliminary Data Sheet
September 2001
L9216B/H
High-Voltage Ringing SLIC with Ground Start
ac Applications
(continued)
Design Examples
(continued)
Third-Generation Codec ac Interface Network—Complex Termination
The following reference circuit, Figure 26, shows the complete SLIC schematic for interface to the Agere T8536
third-generation codec. All ac parameters are programmed by the T8536. Note this codec differentiates itself in
that no external components are required in the ac interface to provide a dc termination impedance or for stability.
For illustration purposes, 0.5 Vrms PPM injection was assumed in this example and no meter pulse rejection is
used. Also, this example illustrates the device using programmable overhead and current limit. Please see the
T8535/6 data sheet for information on coefficient programming.
V
BAT1
C
BAT1
D
BAT1
C
RT
0.1
µF
R
RT
383
kΩ
FUSIBLE OR PTC
50
Ω
V
BAT1
AGERE
L7591
50
Ω
FUSIBLE OR PTC
PT
PR
RTFLT
0.1
µF
V
BAT2
V
CC
C
BAT2
0.1
µF
C
CC
0.1
µF
AGND
ICM
RGDET
ground key
not used
V
BAT1
BGND
V
BAT2
V
CC
ITR
R
GX
4750
Ω
VTX
C
TX
0.1
µF
TXI
C
C1
0.1
µF
VITR
VFXI
R
CIN
DX0
DR0
VFROP
VFRON
DX1
DR1
PCM
HIGHWAY
DCOUT
L9216H
RCVP
RCVN
V
PROG
20 MΩ
V
REF
CF1
C
F1
0.22
µF
CF2
1/4
T8536/8
rate of battery
reversal not
ramped
FS
NSTAT B2
B1
B0
RING
IN
C
RING
0.47
µF
B2
B1
SLIC4a
SLIC3a
SLIC2a DGND
SLIC0a
V
DD
BCLK
FB1
FB2
SYNC
AND
CLOCK
C
F2
0.1
µF
FROM/TO
CONTROL
B0
NSTAT
V
DD
Figure 26. Third-Generation Codec ac Interface Network; Complex Termination
Agere Systems Inc.
41
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
