SNLS666 January 2020 SN75LVPE4410
PRODUCTION DATA.
The VOD or GAIN pins can be used to set the overall data-path DC (low frequency) gain of the SN75LVPE4410 as outlined in the Pin Configuration and Functions section.
Table 2 shows how DC gain of the overall data-paths can be set using GAIN and VOD pins, when in Pin Control mode (EN_SMB = L0).
Desired DC Gain (dB) | GAIN | VOD |
---|---|---|
+3.5 | L3 | L2 |
0 | L2 | L2 |
-1.5 | L2 | L3 |
-3.5 | L2 | L1 |
-6 | L2 | L0 |
It is advised that the DC gain and equalization of the SN75LVPE4410 are set such that the signal swing at DC and high frequency does not exceed the DC and AC linearity ranges of the devices, respectively. For most PCIe systems the default DC gain setting 0 dB (GAIN and VOD pins floating) would be sufficient. However a DC attenuation can utilized to be able to apply extra equalization when needed and keeping the data-path linear.