Simple PCB Design Review

[691175002]

I'm trying to fit a fairly simple circuit into a DB9 Backshell.  I don't really know what I'm doing but I've tested the parts on a breadboard and it works.

The circuit sits in the middle of a servo encoder cable and converts sinusoidal encoder signals to quadrature signals.  There are a bunch of hall sensors, temperature sensors and miscellaneous other wires that are passed through unaltered.  All the work is done by the IC-NV chip.  Both the input and output signals are differential.



Relevant datasheets:
http://www.ichaus.de/upload/pdf/Nv_c1es.pdf
http://www.ti.com/lit/ds/symlink/ua9638.pdf

Nothing particularly notable able the circuit other than its size.  Maximum frequency of the sine input is 200KHz, and the square wave is 2MHz.

I will have it made on 0.8mm FR4 so it can slide between the connector pins.  The circuit is 20x18mm.  The display grid is 1mm.  It passes the Seeed Fusion DRU file using 0.3mm vias.

Could you please let me know if I've done anything stupid.

[T3sl4co1l]

Seems reasonable...

I would make these changes:
- Traces between SOIC pads are undesirable, because they screw up AOI (automated optical inspection) -- looks like shorts.  Even though they're supposed to be shorted, that's the point, but yeah.  Not that that matters any for hand assembly, just good practice.
- There are only three vias/through pads connecting the top and bottom ground fills.  While that's probably fine for something so small, I like to put vias in all ends/peninsulas and corners to better marry the two together.  Again probably doesn't matter here, given the small size, but it's a good practice.

Tim