LUCL9215AAU-D AGERE [Agere Systems], LUCL9215AAU-D Datasheet - Page 45

• Manufacturer Part Number: LUCL9215AAU-D
• Description: Short-Loop Sine Wave Ringing SLIC
• Manufacturer: AGERE [Agere Systems]

September 2001
Agere Systems Inc.
ac Applications
Design Examples
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.
FUSIBLE OR PTC
FUSIBLE OR PTC
V
BAT2
CONTROL
VOLTAGE
50
50
AGERE
L7591
0.1 F
C
383
RT
R
Figure 27. Third-Generation Codec ac Interface Network; Complex Termination
k
RT
CF1
RTFLT
DCOUT
PR
PT
OVH
V
V
PROG
REF
0.22 F
(continued)
(continued)
C
F1
CF2
D
C
0.1 F
BAT1
F2
V
V
BAT1
BAT1
0.1 F
C
BAT1
NSTAT BR B2 B1 B0
CONTROL LATCHES
BGND
FROM/TO T8536
L9215G
0.1 F
C
BAT2
V
V
BAT2
BAT2
V
V
CC
CC
0.1 F
C
CC
AGND
RING
C
0.47 F
IN
RING
PPM
RCVP
RCVN
VITR
Short-Loop Sine Wave Ringing SLIC
VTX
ITR
TXI
IN
C
10 nF
PPM
0.5 Vrms
PPM
R
4750
0.1 F
NSTAT
C
0.1 F
GX
C
20
TX
C1
R
M
BR
B2
B1
B0
CIN
VFXI
VFROP
VFRON
SLIC4a
SLIC3a
SLIC2a
SLIC1a
SLIC0a
T8536/8
1/4
DGND
BCLK
DR0
DR1
DX0
DX1
V
FS
DD
HIGHWAY
CLOCK
SYNC
AND
PCM
V
DD
45