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AD9920A 3-phase h-blanking polarities?

Question asked by on Apr 3, 2013
Latest reply on Apr 25, 2013 by



we've got another problem with the AD9920A, this time regarding the Blanking of the horizontal-drives during vertical shifting.


Our 3-phase CCD demands that R1/R2 are high while shifting, R3 should be low.

The question now would be how to implement that in the frontend configuration - as I understand it, there's only HBLK_MASK_H3P in register 0x18 of the sequence config which configures the masking polarities in 3 phase mode (are the others probably active as well?).


In Figure 34/35 it looks like that that mask level affects all three of them - or do i get it wrong?

I guess ccd's in 3 phase mode are quite similar in that demands, so i guess that should be possible...there must be a way to configure it for it.


Here are the timings i need to generate and what the ad9920a datasheet says to the 3-phase-mode blanking:



Thanks for your help!

Kind Regards,