1. Можно всё с "нуля" сделать.
2. Можно вообще ничего не изменять в "железе", а обойтись "софтовой" реализацией.

Дело в том что для увеличения С/Ш у меня между АЦП и ПЛИС стоят цифровые изоляторы.
Это позволяет гальванически разделить "землю" АЦП и "грязную цифровую землю ПЛИС".

The AFE (which includes the analog-to-digital converter) must be able to drive receiving logic and the accompanying PCB trace capacitance. The combination of the increase in data lines and of higher speed signals presents the system designer with issues in EMI emissions, larger board area (due to the increase in data lines), higher power, and more current transients. This last issue can create kickback noise, a phenomenon wherein transients created by driving the load are coupled back to the ADC analog front end, manifesting in the image as noise or distortion. The previously listed issues present a daunting challenge to users attempting to develop a high performance imaging application. Configurable low voltage differential signaling (LVDS) serial data interface offers another approach to provide high speed data outputs while minimizing performance limitations in AFE applications. LVDS, as the name implies, is a differential signaling scheme using a low voltage swing.

The LVDS offers the following advantages over the conventional parallel interface:

• Reduced kickback noise: LVDS outputs are current output stages requiring a 100 Ω terminating resistor at the receiver, differing from CMOS outputs that generally do not require termination. To avoid current spikes on the supply that can couple to the sensitive analog front end (resulting in kickback noise), the current output results in a fixed dc load current on the output supplies.

• Fewer data lines: With serial data output, the number of data lines is reduced significantly. This is important in applications that require multiple channels, such as higher speed imaging applications needing a small form factor. LVDS serial data outputs dramatically reduce kickback noise due to the limited number of data output switching compared to a 14-bit or 16-bit parallel output bus switching simultaneously.

• Reduced EMI emissions: Because two balanced signals of the same magnitude transmit through the line in opposite directions, the electromagnetic field from each signal is radiated in the opposing direction, effectively canceling each other’s EMI emissions. This reduces shielding, lowering overall system cost. It also reduces RF interference critical in wireless enabled systems.