參數(shù)資料
型號: L9214A
廠商: Lineage Power
英文描述: Low-Cost Ringing SLIC(低價格振鈴用戶環(huán)路接口電路)
中文描述: 低成本振鈴用戶接口(低價格振鈴用戶環(huán)路接口電路)
文件頁數(shù): 30/44頁
文件大?。?/td> 964K
代理商: L9214A
Preliminary Data Sheet
October 2000
Low-Cost Ringing SLIC
L9214A/G
30
Lucent Technologies Inc.
ac Applications
(continued)
Design Examples
(continued)
Example 1, Real Termination
The following design equations refer to the circuit in
Figure 12. 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:
I
T/R
----------------------------------
+
------------
z
T
36
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
-------------------
=
12-3569 (F)
Figure 12. 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
L9214
VF
X
IP
18
18
+
+
相關(guān)PDF資料
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