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STLC3055Q Folha de dados(PDF) 16 Page - STMicroelectronics

Nome de Peças STLC3055Q
Descrição Electrónicos  WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT
PDF  22 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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STLC3055Q Folha de dados(HTML) 16 Page - STMicroelectronics

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APPENDIX A
STLC3055 Test Circuits
Referring to the application diagram shown in fig. 7 of the STLC3055 datasheet and using as external
components the Typ. Values specified in the ”External Components” Table (page 13) find below the
proper configuration for each measurement.
All measurements requiring DC current termination should be performed using ”Wandel & Goltermann
DC Loop Holding Circuit GH-1” or equivalent.
TIP
RING
RX
TX
STLC3055
application
circuit
W&G GH1
Zref
E
Vs
1Kohm
1Kohm
100
µF
100mA
DC max
Zin = 100K
200 to 6kHz
600ohm
100
µF
Figure A1. 2W Return Loss
2WRL = 20Log(|Zref + Zs|/|Zref-Zs|) = 20Log(E/2Vs)
TIP
RING
RX
TX
STLC3055
application
circuit
W&G GH1
Vrx
Vtx
100
µF
100
µF
100mA
DC max
Zin = 100K
200 to 6kHz
600ohm
Figure A2. THL Trans Hybrid Loss
THL = 20Log|Vrx/Vtx|
STLC3055
16/22



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