New current sense amp

[dcstraney]

INA828 is no longer available from any distributors (although still "in production" by Texas Instruments).

• INA818 is a lower-power equivalent with the same bandwidth & pinout; also not available
• INA821 is a higher-bandwidth equivalent with similar power but different pinout; currently very available
• INA819 is a lower-power equivalent to INA821 with same bandwidth as INA828, same pinout as INA821; currently very available Because of availability, etc. best to change to INA821/INA819.
• [x] Symbol
• [x] Schematic update
• [x] Layout update

[dcstraney]

New pinout means that routing will be difficult: Can either...

• Take CS- onto the top layer briefly
• Re-arrange offset-cal circuit to leave room to place the gain resistor next to pins 2 and 3: this may require switching to SOD-323 diodes for the back-to-back zeners
• Try rotating the CS amp 90°, so that pins 2 and 3 are facing upwards towards the edge of the board

Can also swap CS+ and CS- on the amp power board without any issue, if it ends up helping, by connecting the left (CS+) trace entering from the bottom to the diagonal underneath the connector, and routing the right (CS-) trace entering from the bottom around the right outside of the connector footprint.