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STLC5048 Fiches technique(PDF) 40 Page - STMicroelectronics

No de pièce STLC5048
Description  FULLY PROGRAMMABLE FOUR CHANNEL CODEC AND FILTER
PDF  45 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLC5048 Fiches technique(HTML) 40 Page - STMicroelectronics

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(As reported in the absolute gain levels with 61Vrms at VFXI and GX=0dB, the DX output is 0dBm0).
For instance let's calculate which TX gain to program if +4.2dBr @ 600 Ohm is to be set:
VLINE = 0dBm @ 600Ohm
In case of STLC3080 the scaling factor is 100 (instead of 50) while the Rs value is 8200 (instead of 4100) so
the result is the same.
Refering to the formula (1), to have DX equal to 4.2dB with VLINE=0dBm GX must be set to GX = 4.2 - 4.78 =
-0.58dB.
Figure 10. Absolute gain in TX path.
VF XI
VLIN E
600
-------------------
1
50
------
4100
⋅⋅
=
VFXI
VLINE
600
-------------------
1
100
---------- 8200
⋅⋅
=
VLINE
D00TL474
Iline
RS
4100
Ω
(8200 for
STLC3080)
VFXI
VFXI = (-Iline/50)*4100 for L3235N
VFXI = (-Iline/100)*8200 for STLC3080
GX
TXG
1/100 for
STLC3080
1/50
DX
Zadm
STLC5048
L3235N



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