Nikolaos, Now that I've had a chance to look your schematic, I did have a few comments. 1. Right now, it looks like you have separate analog and digital grounds. In general, we like to use a common ground whenever possible. Just consider the analog and digital return current paths so that you don't have large ground loop voltages. 2. It looks like you have two 110Ω resistors for hardware compensation. This would be R4 and R94. I recommend NOT using hardware compensation. You might be trying to increase the resolution by centering the measurement, but in practice, this is very difficult to achieve. You need to consider both the accuracy of the 110Ω resistor and the amount of drift that this resistor has. When you do try to apply hardware compensation, it often performs much worse than you might expect because of the accuracy of this resistor. 3. I'm not very experienced with the supply circuitry, but I always note that circuits with inductors in the supply paths may be problematic. Because of the nature digital circuits, there are large current spikes, which leads to large voltage spikes. The voltage goes as Ldi/dt and you may disrupt digital specifications and I've seen problems with that in the past. Joseph Wu
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