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參數(shù)資料
| 型號： | L9312 |
| 英文描述： | Line Interface and Line Access Circuit Forward Battery SLIC and Ringing Relay for TR-57 Applications |
| 中文描述： | 線路接口和線路接入電路轉(zhuǎn)發(fā)電池SLIC和振鈴繼電器的訓練班- 57應用 |
| 文件頁數(shù)： | 7/40頁 |
| 文件大?。?/td> | 709K |
| 代理商： | L9312 |
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Data Sheet
July 2001
Forward Battery SLIC and Ringing Relay for TR-57 Applications
L9312 Line Interface and Line Access Circuit
Agere Systems Inc.
7
Description
(continued)
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.
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.
Architecture
12-3523e (F)
Figure 1. Architecture Diagram
–
AAC
+
+
–
AX
2.35 V
BANDGAP
REFERENCE
RFT
TIP/RING
CURRENT
SENSE
BGND
ITR/325
RFR
V
BAT
BGND
V
BAT
ITR
ITR
RING TRIP
DETECTOR
SCAN
DETECTOR
SCAN
CLAMP
SCAN
V
BAT
BGND
RT
ILC
ac
INTERFACE
SWITCHHOOK
WINDOW
COMPARATOR
IN
REF
CF2
CURRENT LIMITER
AND
INRUSH CONTROL
CF2
REF
PARALLEL DATA INTERFACE
V
REF
TXI
ITR
TRNG
PT
PR
RTS
RSW
RRING
VTX
V
CC
A
GND
V
BAT2
/PWR
V
BAT
V
BAT1
V
BAT1
BGND
BGND
RCVP
RCVN
CF2
dc
ac
DGND
V
DD
V
PROG
B0
B1
B2
LATCH
RESET
LCTH
LCF
VITR
CONTROL
RT
ILC
FB
RB
VTX
IN
+5V
D
(1 V/50 mA)
SW3
60
SW1
18
SW2
18
+5V
A
V
BAT
V
BAT
BGND
BGND
+
–
OUT AT
+
–
OUT AR
NSTAT
2.35 V
V
REF
SW4
15
ac
CF1
OVH
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