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AD9845B CCD processor data bus tristate not working

Question asked by rogerh on Nov 1, 2012
Latest reply on Feb 21, 2013 by EBarnes

It seems this CCD processor will not tri-state it's data bus under any circumstances, I have tried setting the tri-state bit in the control register and selecting "total power down" in the operation register yet the bus remains driven.  The data sheet (Rev B) even shows a schematic of the output driver including it's tri-state control (page 7), is this yet another case where the data sheet is completely wrong or am i missing something ?

 

PS attached is scope shot of serial write loading control register with tri-state bit set.

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