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| 型號： | L9310 |
| 英文描述： | Line Interface and Line Access Circuit Full-Feature SLIC,Ringing Relay,and Test Access Device |
| 中文描述： | 線路接口和線路接入電路全功能用戶接口，振鈴繼電器，測試接入設(shè)備 |
| 文件頁數(shù)： | 46/60頁 |
| 文件大小： | 1053K |
| 代理商： | L9310 |
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46
Data Sheet
July 2001
Full-Feature SLIC, Ringing Relay, and Test Access Device
L9310 Line Interface and Line Access Circuit
Agere Systems Inc.
First-Generation Codec ac Interface Net-
work: Resistive Termination
The following reference circuit shows the complete
SLIC schematic for interface to the Agere T7504 first-
generation codec for a resistive termination imped-
ance. For this example, the ac interface was designed
for a 600
resistive termination and hybrid balance
with transmit gain and receive gain set to 0 dBm. For
illustration purposes, no PPM injection was assumed in
this example. This implies use of the default overhead
voltage and no components for meter pulse rejection.
Also, this example illustrates the device with a single
battery operation and fixed overhead, current limit, and
loop closure threshold. This is a lower feature applica-
tion example.
Resistor R
GN
is optional. It compensates for any mis-
match of input bias voltage at the RCVN/RCVP inputs.
If it is not used, there may be a slight offset at tip and
ring due to mismatch of input bias voltage at the
RCVN/RCVP inputs. It is very common to simply tie
RCVN directly to ground in this particular mode of oper-
ation. If used, to calculate R
GN
, the impedance from
RCVN to ac ground should equal the impedance from
RCVP to ac ground.
12-3580B (F)
Figure 15. ac Equivalent Circuit
R
P
Z
T
+
–
R
P
V
T/R
I
T/R
V
S
Z
T/R
+
–
RING
A
V
= –1
A
V
= 1
VITR
CURRENT
SENSE
TIP
+
–
R
T3
R
RCV
R
HB1
R
T6
RCVN
RCVP
R
X
VGSX
VF
X
IN
VFR
1/4 T7504 CODEC
R
GP
2.4 V
–0.300 V/mA
A
V
= 4
L9310
VF
X
IP
18
18
20
20
BREAK
SWITCH
BREAK
SWITCH
V
REF
V
REF
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