參數(shù)資料
型號(hào)： L9218A
英文描述： CAP CER 330PF 3.15KVDC R3 RAD
中文描述： 低成本線接口
文件頁(yè)數(shù)： 24/30頁(yè)
文件大?。?/td> 378K
代理商： L9218A
24
Agere Systems Inc.
Data Sheet
November 2001
L9218A/G Low-Cost Line Interface
Applications
(continued)
ac Design
(continued)
Example 1: Real Termination (First-Generation Codec)
(continued)
The following design equations refer to the circuit in Figure 16. Use these to synthesize real termination imped-
ance.
Termination Impedance:
Z
T
=
Receive Gain:
g
rcv
=
g
rcv
=
Transmit Gain:
g
tx
=
g
tx
=
x
Hybrid Balance:
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 following expressions assume the test network is the same as the termination impedance:
R
HB
=
h
bal
= 20log
I
T R
–
--------------
Z
T
2R
P
R
GP
1
--------
R
RCV
-----------
+
+
----------------------------------
+
=
V
fr
-------------
R
GP
1
R
T3
---------------
---------------
+
+
1
Z
T/R
------------
+
-------------------------------------------------------------------------------------
V
T R
--------------
X
R
T6
----------
Z
T
----------
V
T R
--------------
×
g
tx
g
rcv
------------------------
R
HB
-----------
g
tx
–
g
rcv
×
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L9222-D 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD INVERTING TRANSISTOR SWITCH
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