wiki:RoblyerDOSIRackMountOlderNotes

Notes

Clocks: Currently clocks run from mezzanine to carrier for ADC e.g. on H4/H5 (CLK0M2C). This should be OK for the PicoZed FMC board too.

ADC ECO List

  • Change R25 to 20k
  • Connect PWR_EN to VADJ
  • Swap inputs and outputs on U11
  • Either remove PRSNT_M2C signal or connect JTAG TDO-TDI for bypass (jumper?)

DDS ECO List

  • AGND to DGND needs a jumper!
  • Fix the PWR_EN somehow to supply 5V? Suggest U5/U6/U3/U12 (5V input) all default to 'on' while PWR_EN just controls U2 and U4.
  • Serial interface changes:
    • Assign 'SPARE' (LA04_N) as "device select". Route to one nCS, invert to other. Wire to mux to select MISO output.

Carrier ECO List

  • Slots 2, 3, 4 for DDS need LA02 and LA04 wired while on carrier LA02 and LA03 are wired.
  • Add level shifters on SPI for the Si5340 from 2.5V to 1.8V
  • Level shifters on FTDI serial are reversed!
Last modified 4 years ago Last modified on Jan 24, 2019, 10:39:13 AM