SNLS685 December 2020 DS160PR412
The GAIN pin can be used to set the overall datapath flat gain (broadbabd gain including high frequency) of the DS160PR412 when the device is in Pin Mode. The default recommendation for most systems will be GAIN = L3 (float).
The flat gain and equalization of the DS160PR412 must be set such that the output signal swing at DC and high frequency does not exceed the DC and AC linearity ranges of the devices, respectively.
Note the device also provides AC (high frequency) gain in the form of equalization controlled by EQ pins or SMBus/I2C registers.