參數(shù)資料
型號: L9214A
英文描述: CAP CER 220PF 3.15KVDC R3 RAD
中文描述: 低成本振鈴用戶接口
文件頁數(shù): 31/46頁
文件大?。?/td> 790K
代理商: L9214A
Preliminary Data Sheet
October 2001
Low-Cost Ringing SLIC
L9214A/G
Agere Systems Inc.
31
ac Applications
(continued)
Design Examples
(continued)
Example 1, Real Termination
The following design equations refer to the circuit in
Figure 13. Use these to synthesize real termination
impedance.
Termination Impedance:
z
T
=
Receive Gain:
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
--------
+
------------------------------------------------------------------
=
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:
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 13. 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
+
+
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