Owner manual

5
TH7899M
2201A–IMAGE–02/02
HorizontalRegisters Thesensorhastworeadoutregisterslocatedatthetop(registerA)andatthebottom
(registerB)oftheimagearea.Theycanbedrivenindependentlybytwophaseclocks.
Neverthelesstoallowamultiplechargetransferdirectionfortheusefulpixels(left,right
orhalfleftandhalfright),thetwoclocksaresplitinto6clocks(ΦLA
i=1to6
fortheAregis-
terandΦLB
i=1to6
fortheregisterB).Thetransferdirectionisfixedbytheconnection
modeofthesixclocksinto2clocks.
Thedescriptionoftheconnectionwiththetransferdirectionisdescribedin“”onpage9.
Thereadoutregisterhas2072stages,withafurther18extrastagesateachend.What-
everthechosentransferdirectionfortheusefulpixels,the18extrapixels,the7dark
referencesandthe5isolationsarealwaystransferredtothenearestoutputasshownin
thefigurehereunder.
Figure4.AandBReadoutRegisterStructure
ThereadoutregistercanbedrivenintheMPPmodeifnecessary.
BinnedModes Twotypesofsummationcanbeperformed:
• Verticalsummationineachstageoftheserialregister(AorB)
• HorizontalsummationinanoutputsummingwelldrivenbyΦSclockandlocatedat
eachendofthereadoutregisters(AandB).
Nevertheless,onesummationcanbeperformedinboththeregisterandtheoutputsum-
ming,allowinginthisway,tohavearesultingsignalof(2x2)contiguouspixelsfromthe
imagearea.Thus,thesensorisequivalenttoa1024x1024arrayofa28µmx28µm
pixel.Whenusingthebinnedmodewithachargelevel,aftersummation,smallerthan
300ke-(typicalvalue)itisbetter(optimizationofdynamicandlinearity)tokeepthecon-
versionfactorat7µV/e-(with VGL=1VandVDR=13.5V).Butforsummingmodewith
chargelevel,afterbinning,higherthan300ke-,theconversionfactorshouldbereduced
byincreasingtheVGLgateto12VandtheVDRresetdrainto15V.Withsuchamethod,
thesaturationchargeisoptimizedforthebinningmode.
Thissummingtechniqueleadstoanincreasedsignaltonoiseratio,largerpixelsize,
higherframerates(forverticalbinningonly)butattheexpenseofalossinresolution.