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參數資料
| 型號： | L9313 |
| 英文描述： | Line Interface and Line Access Circuit Full-Feature SLIC and Ringing for TR-57 Applications |
| 中文描述： | 線路接口和線路接入電路全功能SLIC和敲響訓練班- 57應用 |
| 文件頁數： | 35/40頁 |
| 文件大小： | 746K |
| 代理商： | L9313 |
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Data Sheet
September 2001
Full-Feature SLIC and Ringing Relay for TR-57 Applications
L9313 Line Interface and Line Access Circuit
Agere Systems Inc.
35
ac Applications
(continued)
First-Generation Codec ac Interface Network: Resistive Termination
Resistor R
GN
is optional. It compensates for any mismatch 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 operation. If used, to cal-
culate R
GN
, the impedance from RCVN to ac ground should equal the impedance from RCVP to ac ground.
12-3580A (F)
Figure 14. 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
L9313
VF
X
IP
18
18
20
20
BREAK
SWITCH
BREAK
SWITCH
V
REF
V
REF
Example 1, Real Termination
The following design equations refer to the circuit in
Figure 14. Use these to synthesize real termination
impedance.
Termination Impedance:
Z
T
=
Receive Gain:
Transmit Gain:
Hybrid Balance:
h
bal
= 20 log
h
bal
= 20 log
To optimize the hybrid balance, the sum of the currents
at the VFX input of the codec op amp should be set to
0. The expression for ZHB becomes:
I
T/R
–
------------
Z
T
76
2
+
R
P
R
GP
1
--------
R
RCV
-----------
+
+
----------------------------------
+
=
g
rcv
V
FR
-----------
=
g
rcv
1
R
T3
-----------
R
GP
-----------
+
+
1
Z
T/R
--------
+
------------------------------------------------------------------
=
g
tx
V
T/R
----------
=
g
tx
X
R
T6
--------
Z
T/R
--------
×
=
R
HB1
--------------
g
tx
–
g
rcv
×
V
FR
--------------
R
HB
k
(
)
×
g
tx
g
rcv
-------------------
=
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