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  1 2 8 - c h a n n e l , 2 4 - b i t c u r r e n t - t o - d i g i t a l a d c a d a s 1 1 2 8 r e v . s p c i n f o r m a t i o n f u r n i s h e d b y a n a l o g d e v i c e s i s b e l i e v e d t o b e a c c u r a t e a n d r e l i a b l e . h o w e v e r , n o r e s p o n s i b i l i t y i s a s s u m e d b y a n a l o g d e v i c e s f o r i t s u s e , n o r f o r a n y i n f r i n g e m e n t s o f p a t e n t s o r o t h e r r i g h t s o f t h i r d p a r t i e s t h a t m a y r e s u l t f r o m i t s u s e . s p e c i f i c a t i o n s s u b j e c t t o c h a n g e w i t h o u t n o t i c e . n o l i c e n s e i s g r a n t e d b y i m p l i c a t i o n o r o t h e r w i s e u n d e r a n y p a t e n t o r p a t e n t r i g h t s o f a n a l o g d e v i c e s . t r a d e m a r k s a n d r e g i s t e r e d t r a d e m a r k s a r e t h e p r o p e r t y o f t h e i r r e s p e c t i v e o w n e r s . o n e t e c h n o l o g y w a y , p . o . b o x 9 1 0 6 , n o r w o o d , m a 0 2 0 6 2 - 9 1 0 6 , u . s . a . t e l : 7 8 1 . 3 2 9 . 4 7 0 0 w w w . a n a l o g . c o m f a x : 7 8 1 . 4 6 1 . 3 1 1 3 ? 2 0 0 9 ? 2 0 1 0 a n a l o g d e v i c e s , i n c . a l l r i g h t s r e s e r v e d . f e a t u r e s 1 2 8 - c h a n n e l , l o w l e v e l c u r r e n t - t o - d i g i t a l c o n v e r t e r u p t o 2 4 - b i t r e s o l u t i o n u p t o 1 9 . 7 k s p s ( 5 0 . 7 s i n t e g r a t i o n t i m e ) s i m u l t a n e o u s s a m p l i n g u l t r a l o w n o i s e ( d o w n t o 0 . 4 f c [ 2 5 0 0 e  ] ) u s e r - a d j u s t a b l e f u l l - s c a l e r a n g e i n l : 0 . 0 2 5 % o f r e a d i n g 0 . 7 5 p p m o f f s r v e r y l o w p o w e r d i s s i p a t i o n : 4 . 5 m w / c h a n n e l l v d s s e l f - c l o c k e d s e r i a l d a t a i n t e r f a c e s p i c o n f i g u r a t i o n r e g i s t e r s ( d a i s y - c h a i n ) o n - b o a r d t e m p e r a t u r e s e n s o r a n d r e f e r e n c e b u f f e r 1 0 m m 1 0 m m , m i n i - b g a p a c k a g e l o w c o s t e x t e r n a l c o m p o n e n t s s u p p o r t t o o l s e v a l u a t i o n b o a r d r e f e r e n c e d e s i g n w i t h r e f e r e n c e l a y o u t f p g a v e r i l o g c o d e a p p l i c a t i o n s m e d i c a l , i n d u s t r i a l , a n d s e c u r i t y c t s c a n n e r d a t a a c q u i s i t i o n p h o t o d i o d e s e n s o r s d o s i m e t r y a n d r a d i a t i o n t h e r a p y s y s t e m s o p t i c a l f i b e r p o w e r m o n i t o r i n g x - r a y d e t e c t i o n s y s t e m s h i g h c h a n n e l - c o u n t d a t a a c q u i s i t i o n s y s t e m s ( c u r r e n t o r v o l t a g e i n p u t s ) g e n e r a l d e s c r i p t i o n t h e a d a s 1 1 2 8 i s a 1 2 8 - c h a n n e l , c u r r e n t - t o - d i g i t a l , a n a l o g - t o - d i g i t a l c o n v e r t e r ( a d c ) . i t c o n t a i n s 1 2 8 l o w p o w e r , l o w n o i s e , l o w i n p u t c u r r e n t i n t e g r a t o r s , s i m u l t a n e o u s s a m p l e - a n d - h o l d s , a n d t w o h i g h s p e e d , h i g h r e s o l u t i o n a d c s w i t h c o n f i g u r a b l e s a m p l i n g r a t e a n d r e s o l u t i o n s u p t o 2 4 b i t s . a l l c o n v e r t e d c h a n n e l r e s u l t s a r e o u t p u t o n a s i n g l e l v d s s e l f - c l o c k e d s e r i a l i n t e r f a c e , w h i c h r e d u c e s e x t e r n a l h a r d w a r e . a n s p i - c o m p a t i b l e s e r i a l i n t e r f a c e a l l o w s c o n f i g u r a t i o n o f t h e a d c u s i n g t h e s d i i n p u t . t h e s d o o u t p u t a l l o w s t h e u s e r t o d a i s y - c h a i n s e v e r a l a d c s o n a s i n g l e , 3 - w i r e b u s . t h e a d a s 1 1 2 8 u s e s t h e s e p a r a t e s u p p l y i o v d d t o r e d u c e d i g i t a l n o i s e e f f e c t o n t h e c o n v e r s i o n s . t h e a d a s 1 1 2 8 i s i n a 1 0 m m 1 0 m m , m i n i - b g a p a c k a g e . f u n c t i o n a l b l o c k d i a g r a m f s / h o r 0 f s / h o r 6 3 a d c l +? a n 0 a n 6 3 f s / h o r 6 4 f s / h o r 1 2 7 a d c h +? a n 6 4 a n 1 2 7 k g n d v t d a t a p r o c e s s i n g l v d s / c m o s i n t e r f a c e t e m p e r a t u r e o r [ 0 : 1 2 7 ] a d a s 1 1 2 8 b u f p l b u f n l 2 . 5 v 3 . 3 v t o n e x t s d i s d i s d o b u f p h b u f n h r e f 2 . 0 4 8 v s d i f r o m p r e v i o u s s d o s d i r e f c o n f i g u r a t i o n s c k c s d o u t x c l k x s y n c i o v d d r e s e t i o g n d t o a l l a d c s 2 . 5 v f r o m d o u t o f o t h e r a d c s f p g a v i o 0 8 0 4 5 - 0 0 1 f i g u r e 1 .
a d a s 1 1 2 8 r e v . s p c | p a g e 2 o f 2 n o t e s ? 2 0 0 9 ? 2 0 1 0 a n a l o g d e v i c e s , i n c . a l l r i g h t s r e s e r v e d . t r a d e m a r k s a n d r e g i s t e r e d t r a d e m a r k s a r e t h e p r o p e r t y o f t h e i r r e s p e c t i v e o w n e r s . d 0 8 0 4 5 f - 0 - 9 / 1 0 ( s p c )


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