I've run into obstacles in installation of an ADS1278EVM-PDK.
I obtained this package about two years ago, for a project that went dormant for a time. Now I'm trying to get restarted,
and here are the things that I've run into:
Regarding board revision identification, my ADS1278EVM board has a date code 0731 printed near J8, and it is marked
6492525 BOM A and 6492528 PCA A, both markings near J5A.
The current edition of the ADS1278EVM-PDK user guide (April 2010) describes an EVM board that's diffterent from mine.
Differences that I've noted so far:
My board contains nine red slide switches, the ADS1278EVM-PDK user guide describes a board having ten red slide
switches. The picture on the first page of the user guide doesn't have the tenth switch, S12, and looks generally like my board.
The picture on page 12 of the user guide (SBAU129D–November 2007–Revised April 2010) shows the extra switch, and discussion
on page 11 indicates that this is S12. S12 is also in the schematic. It appears that S12 has replaced thefunction that is served by J6
of my board. How should I set the jumpers of J6 to obtain the frame sync mode that's discussed on page 11 of the guide?
My board contains a J18 that is a three-pin group of 0.025" posts, and the ADS1278EVM-PDK user guide describes J18
as a two-pin group. The schematic that's a part of the ADS1278EVM-PDK also shows J18 as a two-pin group. The user
guide doesn't seem to offer information as to the application of J18, but J18 contained a jumper when I received it. I have
no guidance as to use of this pin group.
Power supply option settings exist on the MMB80 DDS board, which is the "host" board of the ADS1278EVM-PDK board pair. While it might come to pass that I will choose to apply a set of external power sources to the ADS1278EVM board, I would like to begin by using the AC adaptor provision that's available on the MMB0 board. It appears that there are three power configuration jumpers on the MMB0 board that I need to set: J12 should be installed- done. A pair of jumpers were supplied at J13, and my reading of the ADS1278EVM-PDK user guide leads me to the conclusion that I should install a jumper on the two right-hand pins of J13, and I should not install a jumper on the two left-hand pins of J13. Done.
Also on the MMB80 board, set the BOOT MODE slide switch to USB. Done.
Power supply settings on the ADS1278EVM for use of AC adaptor power from the MMB80 board:
J4 (two pins) Jumper installed to enable the on-board power supply, as shown in schematic.
J15 (three pins) Jumper installed on the left two pins, marked OB, for use of on-board +10V supply.
J16 (three pins) Jumper installed on the left two pins, marked OB, for use of on-board -10V supply.
In summary, the ADS1278EVM board gets these power supplies, from sources as noted:
+3.3VD from MMB80 board via power header J3
+1.8VD pin of power header J3 is not used
+5VA from MMB80 board via power heaer J3 and installed MMB80 jumper on right half of MMB80 J13.
+VA from ADS1278EVM on-board power conversion and settings of ADS1278EVM J4 and J15.
-VA from ADS1278EVM on-board power conversion and settings of ADS1278EVM J4 and j16.
+5VD from MMB80 board is the power source for ADS1278EVM +10V and -10V converters.
Done
The ADS1278EVM board. J19 is mentioned in ADS1278EVM-PDK user guide page 9; the following statement is made:
"If using the ADS1278EVM as part of the ADS1278EVM-PDK, J19 should not have any pins shorted." Done.
ADS1278EVM J17 installed.
ADS1278EVM J6 (four pins) FSYNC select, jumper installed on the pair of pinse marked FSR.
I installed ADCPRO, plugged the power and USB connectors onto the MMB80, and the host computer prompted for installation of a USB driver. I chose the Install Automatically mode as described on ADS1278EVM-PDK User Guide pages 18-20. OK so far.
I started ADCPRO, and a process began that never ran to success. A message appears, "DSP not ready.... retrying" then this process later times out with a "not connected" message. ADCPRO continues to run, rather than being unresponsive to operator input. The MMB80 board contains a 7-segment LED display that has a symbol that looks like a b with its lower-left segment missing.
What's needed to make this work? I've put enough time into fruitless results that I would junk this board set and buy another one to save time. Of course that's not my favorite idea...
