Re: HV board / ASIC

["Fernando J. Barbosa" <barbosa@jlab.org>]

Hi Yves,


Yves Van Haarlem wrote:
> Dear Fernando,
>
> We are slowly reaching towards finalizing the new CDC prototype. We 
> will use the mapping you proposed for the leads on the EDAC connector. 
> Is there any progress on the new HV-board? 
I have not yet finished the design of the HVB, due to other commitments, 
but I expect to complete it next week. Fabrication and assembly will 
follow. I will also include holes for the cable holder, as you requested.
> Another thing which is a little less important would be the 
> availability of another ASIC board with two/three ASIC chips to plug 
> into the HV board. I know, even with 24 armed straws we have not 
> enough shaper and fADC channels to read them out --- at the moment.
I still have a few chips left but I need to order more PCBs. Assembling 
3 chips is a bit tricky, but possible, due to the cover on the ICs. The 
shaper boards only accepts 16 inputs, though.
>
> Just double checking: Is it correct that channels 9-16 are not read 
> out if we use the ASIC board with only two chips (so we have to 
> connect channels 9-16 of the EDAC connector to the least important 
> straws).
Yes, that's correct. The third chip, on the back, would cover channels 
9-16. But the shaper only reads 16 channels and the cable that you have 
has been modified to route channels 1-8 and 17-24 into the 16 channels 
of the shaper.

Have you finalized the gain measurements for the CDC? I need to finalize 
the ASIC specs by next week and will circulate a spec sheet for comments.

Regards,
Fernando



>
> Cheers and thanks,
>     Yves
>
>
>
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>                          /   Yves Van Haarlem
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