STLC5048 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STLC5048 Datasheet PDF : 45 Pages
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STLC5048
(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
VFXI = V-----L6---0-I--N-0----E-- ⋅ 5--1--0-- ⋅ 4100
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.
VFXI = V-----L6----0I--N-0----E-- ⋅ 1----10---0-- ⋅ 8200
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.
GX
DX
TXG
STLC5048
VFXI
RS
4100Ω
(8200 for
STLC3080)
VFXI = (-Iline/50)*4100 for L3235N
VFXI = (-Iline/100)*8200 for STLC3080
1/100 for
STLC3080
1/50
L3235N
VLINE
Iline
Zadm
D00TL474
40/45
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