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參數(shù)資料
| 型號(hào)： | L9215G |
| 廠商： | Lineage Power |
| 英文描述： | Short-Loop Sine Wave Ringing SLIC(短環(huán)路正弦波振鈴用戶接口（SLIC）) |
| 中文描述： | 短回路正弦波振鈴用戶接口（短環(huán)路正弦波振鈴用戶接口電路（SLIC）） |
| 文件頁數(shù)： | 34/46頁 |
| 文件大?。?/td> | 1165K |
| 代理商： | L9215G |
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Advance Data Sheet
October 2000
Short-Loop Sine Wave Ringing SLIC
L9215A/G
34
Lucent Technologies Inc.
ac Applications
(continued)
Design Examples
(continued)
First-Generation Codec ac Interface Network—
Resistive Termination
(continued)
This is a lower feature application example and uses
single battery operation, fixed overhead, current limit,
and loop closure threshold.
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 RGN, the impedance from
RCVN to ac ground should equal the impedance from
RCVP to ac ground.
Example 1, Real Termination
The following design equations refer to the circuit in
Figure 22. Use these to synthesize real termination
impedance.
Termination Impedance:
z
T
=
Receive Gain:
Transmit Gain:
Hybrid Balance:
h
bal
= 20log
h
bal
= 20log
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 the following:
T/R
–
------------
z
T
50
2
+
R
P
R
GP
1
--------
R
RCV
-----------
+
+
----------------------------------
+
=
g
rcv
V
FR
-----------
=
g
rcv
1
R
T1
-----------
R
GP
-----------
+
+
1
Z
T/R
--------
+
------------------------------------------------------------------
=
g
tx
V
T/R
----------
=
g
tx
X
R
T2
--------
Z
T/R
--------
×
=
R
HB
-----------
g
tx
–
g
rcv
×
V
FR
--------------
R
HB
k
(
)
×
g
tx
g
rcv
-------------------
=
12-2554.V (F)
Figure 22. 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
T1
R
RCV
R
HB1
R
T2
RCVN
RCVP
R
X
VGSX
VF
X
IN
V
FR
1/4 T7504 CODEC
R
GP
+2.4 V
–0.300 V/mA
A
V
= 4
L9215
VF
X
IP
18
18
+
–
+
–
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| L9218A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
| L9219A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and Dual Current Limit |
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