L9215A/G
Short-Loop Sine Wave Ringing SLIC
Data Sheet
September 2001
ac Applications (continued)
Design Examples (continued)
Third-Generation Codec ac Interface Network—Complex Termination
The following reference circuit shows the complete SLIC schematic for interface to the Agere T8536 third-genera-
tion 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
ITR
CRT
RTFLT
RGX
4750 Ω
0.1 µF
RRT
383 kΩ
VTX
DCOUT
PR
CTX
FUSIBLE OR PTC
50 Ω
AGERE
0.1 µF
TXI
CC1
0.1 µF
VBAT2
L7591
VFXI
DX0
DR0
VITR
50 Ω
RCIN
20 MΩ
PT
L9215G
FUSIBLE OR PTC
PCM
HIGHWAY
DX1
DR1
VFROP
VFRON
RCVP
RCVN
OVH
CONTROL
VOLTAGE
VPROG
1/4
T8536/8
SYNC
AND
CLOCK
FS
VREF
SLIC4a
SLIC3a
SLIC2a
SLIC1a
SLIC0a
BCLK
B2
B1
CF1
CF1
CF2
NSTAT BR B2 B1 B0
RINGIN
PPMIN
CPPM
10 nF
CRING
0.47 µF
B0
0.22 µF
DGND
VDD
CF2
0.1 µF
FROM/TO T8536
CONTROL LATCHES
BR
NSTAT
VDD
PPM
0.5 Vrms
Figure 27. Third-Generation Codec ac Interface Network; Complex Termination
Agere Systems Inc.
45
AGERE [ AGERE SYSTEMS ]
