LUCL9313AP-D AGERE [Agere Systems], LUCL9313AP-D Datasheet - Page 7

• Manufacturer Part Number: LUCL9313AP-D
• Description: Line Interface and Line Access Circuit Full-Feature SLIC and Ringing for TR-57 Applications
• Manufacturer: AGERE [Agere Systems]

September 2001
Description
The L9313 uses a voltage feed, current sense architec-
ture; thus, the transmit gain is a transconductance. The
L9313 transconductance is set via a single external
resistor, and this device is designed for optimal perfor-
mance with a transconductance set at 300 V/A.
The L9313 offers an option for a single-ended to differ-
ential receive gain of either 8 or 2. These options are
mask programmable at the factory and are selected by
choice of part number.
A receive gain of 8 is more appropriate when choosing
a first-generation type codec where termination imped-
ance, hybrid balance, and overall gains are set by
external analog filters. The higher gain is typically
required for synthesization of complex termination
impedance.
Architecture
Agere Systems Inc.
RRING
TRNG
RSW
(continued)
V
RTS
VTX
TXI
ITR
REF
PR
PT
(1 V/50 mA)
DETECTOR
AAC
–
+
RING TRIP
VITR
SW3
60
SW1
18
SW2
18
AX
+
–
SW4
15
+5V
V
CC
BGND
V
BGND
V
VITR
BAT
BAT
A
RT
A
Full-Feature SLIC and Ringing Relay for TR-57 Applications
REFERENCE
GND
BANDGAP
2.35 V
ITR
ITR
Figure 1. Architecture Diagram
FB
RB
ITR/325
BGND
SCAN
V
CURRENT
BAT
TIP/RING
LCF
COMPARATOR
SWITCHHOOK
SENSE
RFT
RFR
WINDOW
2.35 V
V
REF
CLAMP
SCAN
ILC
IN
LCTH
RGDET
VTX
REF
DETECTOR
RING GND
SCAN
RESET
&
IN
ICM
ILC
PARALLEL DATA INTERFACE
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 L9313.
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.
REF
NSTAT
V
CURRENT LIMITER
INRUSH CONTROL
BGND
BAT2
OUT AR
OUT AT
V
V
/PWR
BAT
BAT
RT
LATCH
BGND
AND
+
–
+
–
CONTROL
CF2
CF2
INTERFACE
B2
V
BAT1
ac
B1
V
BAT
B0
V
BAT1
dc
V
ac
PROG
x1
x1
BGND BGND
+5V
V
DD
FBRB
D
DGND
FB
RCVP
RCVN
FB1
CF1
OVH
CF2
FB2
12-3523f (F)
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