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AD7176-2: SPI transmission lines

Question asked by Hairyback on May 17, 2013
Latest reply on Jun 6, 2013 by cdeng

Dear colleagues,


       interfacing the AD-7176-2 (EVAL-AD7176-2SDZ board in standalone mode) with an ARM Cortex M3 prototype board (NXP: LPC 1768, but that shouldn't matter). Adapted the driver, and it all seems to work find and dandy, except that the false read rate for a byte is more than 50% - but the times it reads correctly, the results are consistent. The EVAL-7176-2 board works OK (verified it w./ the EVAL-SDP-CB1Z board).


      I suspect it's an impedance matching problem in the transmission line (right now, basically short jumper wires, ~3-4"). Does anybody have any input on choosing termination resistors?


Thanks and Best Regards,