L9216B/H
Preliminary Data Sheet
September 2001
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.
VBAT1
VBAT2 VCC
CBAT1
CBAT2
CCC
DBAT1
VBAT1
0.1 µF 0.1 µF
0.1 µF
BGND VBAT2 VCC
AGND
ICM
RGDET
ground key
not used
ITR
CRT
RTFLT
RGX
4750 Ω
0.1 µF
RRT
383 kΩ
VTX
CTX
DCOUT
PR
0.1 µF
FUSIBLE OR PTC
50 Ω
AGERE
TXI
CC1
0.1 µF
VBAT1
DX0
DR0
VFXI
VITR
L7591
RCIN
20 MΩ
L9216H
50 Ω
PT
PCM
HIGHWAY
DX1
DR1
FUSIBLE OR PTC
VFROP
VFRON
RCVP
RCVN
VPROG
1/4
T8536/8
VREF
rate of battery
reversal not
ramped
SYNC
AND
CLOCK
FS
SLIC4a
SLIC3a
SLIC2a
SLIC0a
BCLK
B2
B1
CF1
CF1
CF2
FB1 FB2
NSTAT B2 B1 B0
RINGIN
CRING
0.47 µF
0.22 µF
DGND
VDD
CF2
0.1 µF
B0
FROM/TO
CONTROL
NSTAT
VDD
Figure 26. Third-Generation Codec ac Interface Network; Complex Termination
Agere Systems Inc.
41
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