Last week I had ordered the PCBs and said that to stay on schedule I should have assembled boards by the following week (right now). Luckily, the PCBs arrived a little earlier than expected!
Everything looks great and they passed basic electrical tests (power rails not shorted, etc.) Since the Mouser and Digikey BOM arrived a few weeks ago, I stenciled the board with solder paste, placed all the components, and reflowed it. There were a few shorts and tombstoned capacitors that I had to fix manually, but the finished board looks great:
Bring-up was smooth and it’s ready to be fully tested now. I forgot to order 0603 10uF capacitors so there are some un-placed footprints on the board but these are just decoupling capacitors and there is ample capacitance even without those so I don’t foresee any issues. I’ve tested all the basic functionality (control signal DAC via i2c, filters, amplifier) including adjusting filter resonance and cutoff. Everything is working and now I can fully test/characterize it and generate bode plots of the filter response.
This puts us about a week behind, which should be OK because we have a lot of momentum now to push through the final bit of the project. To finish up, next week the deliverable should be a fully tested analog board and integration with the microcontroller.