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8 / 9 page ADCDS-1403 8 ®® Figure 11. ADCDS-1403 Timing Diagram Figure 10. Reference Hold Timing which is the difference between the "held" reference level and its associated video level. When the "CDS Output" signal has settled to the desired accuracy (user defined), the A/D conversion process can be initiated with the rising edge of a single start convert (Pin 25) signal. Once the A/D conversion has been initiated, Reference Hold (Pin 26) can be placed back into the "Acquisition" mode in order to begin aquiring the next reference level. For optimal performance the ADCDS-1403's internal sample-hold should be placed back into the "Aquisition" mode (Reference Hold to logic "0") during the CCD's "Reference Quiet Time" ("Reference Quiet Time" is defined as the period when the CCD's reference signal has settled from all switching transients to the desired accuracy (see Figure 10.)). Placing the sample-hold back into the "aquisition" mode during the "Reference Quiet Time" prevents the ADCDS-1403's internal amplifiers from unecessarily tracking (reproducing) the large switching transients that occur during the CCD's reset to reference transition. CCD OU T P U T RE F E RE N C E HO L D N o t e : F o r opt i m al per f o r m anc e ( F as t e s t A c qui s i t i on T i m e ) , t he A D C D S - 1 403 s houl d be pl ac ed i n t o t he A c qui s i t i on m ode ( R ef er enc e H o l d t o l ogi c " 0 " ) d u r i n g t h e CCD o u t p u t ' s R e f e r e n c e " Q u i e t T i m e " . Re f e r e n c e " Q u i e t T i m e " i s d e f i n e d a s t h e p e r i o d wh e n t h e r e f e r e n c e s i gnal ' s s w i t c hi ng t r ans i ent s hav e s e t t l ed t o an ac c ept a b l e ( us e r def i n e d ) ac c u r a c y . HO L D Re s e t Vi d e o R e f e r enc e R e f e r enc e " Q ui et T i m e " 100N S M I N . A c q u i s it io n T i m e A c qui s i t i on m ode dur i ng R e f e r enc e " Q ui et T i m e" Re s e t N R e s e t N + 1 Re s e t N+ 2 R e s e t N + 3 Re s e t N+ 4 N o t e : A s des c r i b ed i n F i gur e 1 0, t he 60ns m i n . i s dependant o n t he qual i t y of t he C C D ' s R ef er enc e w hen t he A DCDS - 1 4 0 3 i s s wi t c h e d b a c k i n t o t h e t r a c k m o d e CCD OU T P U T ST AR T CO NV E R T RE F E RE NCE HO L D I N CDS OU T P U T DA T A OU T P U T 100ns m i n . 133ns m i n 120ns m i n s et t l i n g l i ne F u ll S c a l e St e p 150ns m i n D A T A N - 4 V A L ID D A T A N - 3 V A L ID D A T A N - 2 V A L ID D A T A N - 1 V A L ID D A T A N V A L ID 20ns m i n N Re f N Vi d e o N R e f. N + 1 V i deo N + 1 100ns m i n . 333ns m i n . 120ns m i n . s e t t l i ng t i m e 150ns t y p . 20ns m ax R e f. N Vi d e o N V i deo N + 1 R e f. N + 2 V i deo N + 1 V i deo N + 2 R e f. N + 3 V i deo N + 1 Vi d e o N + 3 R e f. N + 4 N+ 2 N+ 3 N N+ 1 N+ 2 N+ 3 Ho l d A c qui s i t i on Ti m e N+ 1 In v a l i d d a ta 3 0 n s m i n ., 5 0 n s m a x . D A T A VAL I D |
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Mô tả tương tự - ADCDS-1403EX |
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