L9214A/G
Low-Cost Ringing SLIC
Preliminary Data Sheet
October 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. Please see the
T8535/6 data sheet for information on coefficient programming.
VBAT1
VBAT2 VCC
CVBAT1
CVBAT2
CCC
RRT1
133 kΩ
CCC1
820 pF
DBAT1
0.1 µF 0.1 µF
BGND
0.1 µF
RCR
2 kΩ
CRT
1 µF
VBAT1
VBAT2 VCC
AGND ICM TRGDET
ITR
ground key
not used
RTFLT
RGX
RRT2
4750 Ω
75 kΩ
VTX
DCOUT
RIPROG
CTX
5.76 kΩ
0.1 µF
IPROG (ILOOP = 25 mA)
IREF
TXI
CC1
0.1 µF
RIREF
28.7 kΩ
VITR
VFXI
DX0
DR0
FUSIBLE RESISTOR
OR PTC
L9214G
PCM
HIGHWAY
PR
PT
DX1
DR1
50 Ω
AGERE
L7591
VBAT1
VFROP
VFRON
RCVP
RCVN
50 Ω
FUSIBLE RESISTOR
OR PTC
SYNC
AND
CLOCK
FS
BCLK
B3
B2
SLIC5a
SLIC4a
CF1
CF2
FB1
FB2
NSTAT B3 B2 B1 B0
CF1
B1
B0
SLIC3a
SLIC2a
CFB1
0.01 µF
CFB2
0.01 µF
0.22 µF
DGND
VDD
CF2
0.1 µF
FROM/TO
CONTROL
NSTAT
SLIC0a
VDD
1/4 T8536
CODEC
12-3534.Z1 (F)
Figure 18. Third-Generation Codec ac Interface Network; Complex Termination (3 REN Configuration)
40
Agere Systems Inc.
AGERE [ AGERE SYSTEMS ]
