| Suggested Change |
Justification |
Risk |
proponent |
Approval |
| R375, should it be 243, or 249 ohms | Bill of Materials Consilidation |
None |
gtp |
Rev 5.1 |
| R348, should it be 2.2K or 2.4K ohms | Bill of Materials Consilidation | None |
gtp |
Rev 5.1 |
| R215 and R214 NO-LOAD | Not needed |
None |
gtp |
Rev 5.1 |
| R357 NO-LOAD |
Not needed |
None |
gtp |
Rev 5.1 |
| SDRAM Upgrade; double density |
Save Power. Footprint compatible |
None to low |
gtp |
|
| Keyed connector for TP38 http://rocky.digikey.com/WebLib/Amp/Web%20Data/640454.pdf in 2-pin AMP, A19423-ND from Digi-Key |
Simplify testing |
None |
hsm |
Rev 5.1 |
| Clean up around Solder
Posts (which ones?) |
Aesthetics &
manufacturability |
Moderate |
rhm |
|
| Change test points to surface
mount resistor footprints (which ones?) |
Fewer Vias. Complexity
reduction Less convenient for probes. Probably won't save vias |
Moderate to high |
rhm |
|
| Improve power plane segmentation
(How?) |
Noise control? Aesthetics Manufacturability |
Moderate to high |
rhm |
|
| Tweak 96V net routing (How?) |
Aesthetics Manufacturability |
Moderage to high |
rhm |
|
| Bevel corners of traces on inner
layers (How should be relatively obvious) |
Manufacturability & quality |
low to moderate |
rhm |
|
| Serial ADC U4, and U79 from
Maxim to Analog Devices AD7490 16 input (2.5V ref required) or AD7265
12 input |
Meet extended temperature range |
Moderate to high |
ek |
|
| TP3, TP4, TP6, TP7, TP14, TP15, TP16, TP17 NO-LOAD | Not needed on perfect boards |
None |
gtp |
Rev 5.1 |
| JP16 NO-LOAD |
Not needed on perfect boards | None |
gtp |
Rev 5.1 |
| C174 change to 130pF (?) in
schematic |
Documentation correction |
None |
gtp |
Rev 5.0 |
| Remove SMD from J10 description |
Documentation correction |
None |
gtp |
Rev 5.0 |
| Add footprint for flasher ps
load resistor |
Documentation correction |
Low |
gtp |
Rev 5.1 |
| Change R69 from 511 to 499 1% |
Component consolidation |
None |
gtp |
Rev 5.1 |
| Buffers/level converters on
digital inputs of ATWDs |
Improve margins, Reduce power,
Change timing slightly |
Moderate to high |
bk |
|
| 1K 1% Resistor from U13-3 to
JP20-1 1K 1% Resistor from U14-3 to JP20-2 (package deal. If you do one, you must do both) |
Improve LC transmit waveform
recovery |
Moderate |
gtp hy drn |
Rev 5.1 |
| Connect U6-2 to 1.8V instead of
5V, allowing R35 to be changed from a 6.8V zener diode back into a 1K
resistor. [substituting the zener for the resistor was a work-around
(that I'm not pleased with)] - alternate solution
- use R45 to monitor TP17 in order to get an accurate maesurement
of the voltage delivered to the LED |
More accurate monitoring of LED
voltage, via ADC channel 14 |
low to moderate |
gtp |
|
| Either MOVE Terminal Posts OR
Replace Terminal Posts with an approved connector |
Improve Integration |
Moderate |
Wisc |
Rev 5.1 |
| Change JP1, the ribbon cable
header, to a latching connector, or an IDC header A few anchoring holes, for a ty-wrap, would be an alterntive |
Improve reliability |
low |
Wisc |
Rev 5.1 |
| Move termination jumper to the
edge of the board |
Improve flexibility |
moderate |
Wisc |
|
| Move A/B jumper to the edge of
the board |
Improve flexibility |
Low |
Wisc |
Rev 5.1 |
| Change 64 from Maxim part to
Analog Devices ADR423BR, with removal of JU14 and JU15, and removal of
C394. C392 mandatory |
parts availability |
low to none |
gtp/jkj/jmj |
Rev 5.1 |
| Move resistor R121 close to FPGA
end |
signal quality |
low to moderate |
gtp/jmj |
Rev 5.1 |