LUCL9312AP-D AGERE [Agere Systems], LUCL9312AP-D Datasheet - Page 7

• Manufacturer Part Number: LUCL9312AP-D
• Description: Line Interface and Line Access Circuit Forward Battery SLIC and Ringing Relay for TR-57 Applications
• Manufacturer: AGERE [Agere Systems]

July 2001
Description
A receive gain of 2 is more appropriate when choosing
a third-generation type codec. Third-generation codecs
will synthesize termination impedance, set hybrid bal-
ance, and set overall gains. To accomplish these func-
tions, third-generation codecs typically have both
analog and digital gain filters. For optimal signal-to-
noise performance, it is best to operate the codec at a
higher gain level. If the SLIC then provides a high gain,
the SLIC output may be saturated causing clipping dis-
tortion of the signal at tip and ring. To avoid this situa-
tion, with a higher-gain SLIC, external resistor dividers
are used. These external components are not neces-
sary with the lower gain offered by the L9312.
Architecture
Agere Systems Inc.
RRING
TRNG
RSW
V
RTS
VTX
TXI
ITR
REF
PR
PT
(1 V/50 mA)
(continued)
DETECTOR
AAC
–
+
RING TRIP
SW3
60
SW1
18
SW2
18
AX
+
–
SW4
15
+5V
V
CC
BGND
V
BGND
V
VITR
BAT
BAT
A
RT
Forward Battery SLIC and Ringing Relay for TR-57 Applications
A
REFERENCE
GND
BANDGAP
2.35 V
ITR
ITR
FB
RB
ITR/325
BGND
SCAN
V
CURRENT
BAT
TIP/RING
Figure 1. Architecture Diagram
COMPARATOR
LCF
SWITCHHOOK
SENSE
RFR
RFT
WINDOW
2.35 V
V
CLAMP
REF
SCAN
ILC
IN
LCTH
VTX
REF
DETECTOR
SCAN
RESET
IN
ILC
V
BAT2
The RCVP/RCVN SLIC inputs are floating inputs. If
there is not feedback from RCVP/RCVN to VITR,
RCVP/RCVN may be directly coupled to the codec out-
put. If there is feedback, RCVP/RCVN must be ac-cou-
pled to the codec output.
This device is packaged in a 44-pin PLCC surface-
mount package.
PARALLEL DATA INTERFACE
REF
NSTAT
/PWR
CURRENT LIMITER
INRUSH CONTROL
BGND
OUT AR
OUT AT
V
V
BAT
BAT
RT
LATCH
BGND
AND
+
–
+
–
CONTROL
CF2
CF2
V
BAT1
INTERFACE
B2
V
BAT
ac
B1
V
BAT1
B0
V
ac
ac
dc
PROG
BGND
+5V
V
DD
D
DGND
BGND
RCVP
RCVN
CF2
CF1
OVH
12-3523e (F)
7