STLC5048

40/45

(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

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