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L3234 数据表(PDF) 21 Page - STMicroelectronics

部件名 L3234
功能描述  HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS
PDF  26 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L3234 数据表(HTML) 21 Page - STMicroelectronics

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APPENDIX A
L3235 TEST CIRCUITS
Referring to the test circuit reported in fig 17 you
can find the proper configuration for the main
measurements.
In particular:
A-B: Line terminals
C: Tx sending output on 4W side
D: Rx receiving input on 4W Side
Figure A1: 2W Return Loss
Figure A2: Trans-hybrid Loss
RL = 20 log
|ZML
− Z|
|ZML
+ Z|
= 20 log
|2VS |
|E
|
Figure A3: Sending Gain
THL = 20log
VS
VR
100
µF
100
µF
100
µF
100
µF
100
µF
100
µF
L3234 - L3235
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