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| 型號： | LUCL9219GAR-D |
| 英文描述： | Low-Cost Line Interface with Reverse Battery and Dual Current Limit |
| 中文描述： | 低成本線接口，具有反向電池和雙電流限制 |
| 文件頁數(shù)： | 17/30頁 |
| 文件大?。?/td> | 397K |
| 代理商： | LUCL9219GAR-D |
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24
Agere Systems Inc.
Data Sheet
November 2001
with Reverse Battery and Dual Current Limit
L9219A/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:
ZT =
Receive Gain:
grcv =
Transmit Gain:
gtx =
x
Hybrid Balance:
hbal = 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:
RHB =
hbal = 20log
VTR
ITR
–
--------------
ZT
2RP
3168
1
RT3
RGP
---------
RT3
RRCV
------------
++
-----------------------------------
+
=
VTR
Vfr
--------------
7.86
1
RRCV
RT3
---------------
RRCV
RGP
---------------
++
1
ZT
ZT/R
-------------
+
-------------------------------------------------------------------------------------
VGSX
VTR
---------------
RX
RT6
----------
403
ZT
-----------
VGSX
VTR
---------------
RX
gtx
grcv
×
-------------------------
RX
RHB
------------
gtx
–
grcv
×
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