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C3372 K1536CT AD8804 DSPIC3 FST3135 4001B 448640 TA0706A
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  c u r r e n t t o v o l t a g e c o n v e r t e r f o r p i g t a i l e d p h o t o d i o d e f i b e r o p t i c p o w e r m o n i t o r s f e a t u r e s t h e d n 1 3 5 i s a c u r r e n t t o v o l t a g e c o n v e r t e r t h a t i s i n t e n d e d f o r u s e i n f i b e r o p t i c p o w e r m o n i t o r s . t h e d e v i c e c o n v e r t s c u r r e n t f r o m a p h o t o d i o d e t o v o l t a g e t h a t i s p r o p o r t i o n a l t o t h e i n c o m i n g o p t i c a l p o w e r i n d b m . t h e d n 1 3 5 f u n c t i o n s e q u a l l y w e l l w i t h i n g a a s a n d s i l i c o n p h o t o d i o d e s . 7 0 d b d y n a m i c r a n g e c o n v e r t s c u r r e n t l e v e l s f r o m 1 0 0 p a t o 2 m a 0 . 5 0 0 v o l t s o u t p u t p e r d e c a d e i n c r e a s e i n o p t i c a l p o w e r o p e r a t e s f r o m 5 v o l t s s u p p l i e s d a t a s h e e t d n 1 3 5 t h e r m d n 1 3 5 x x x x 1 . 2 5 v o l t s r e f . c a l i b r a t i o n a d j u s t m e n t 1 0 k w 6 . 8 1 k w p i g t a i l e d p h o t o d i o d e + 5 v - 5 v o u t p u t o p t i c a l p o w e r i n p i n d n 1 3 5 i n p u t p o w e r w a t t s d b m v o l t s 1 1 0 0 1 0 1 1 0 0 1 0 1 m w m w m w m w n w n w n w 1 0 0 p w 0 - 1 0 - 2 0 - 3 0 - 4 0 - 5 0 - 6 0 - 7 0 4 . 0 0 0 3 . 5 0 0 3 . 0 0 0 2 . 5 0 0 2 . 0 0 0 1 . 5 0 0 1 . 0 0 0 0 . 5 0 0 o u t p u t v o l t a g e i n p u t c u r r e n t a m p e r e s v o l t s 1 1 0 0 1 0 1 1 0 0 1 0 1 m a m a m a m a n a n a n a 1 0 0 p a 4 . 0 0 0 3 . 5 0 0 3 . 0 0 0 2 . 5 0 0 2 . 0 0 0 1 . 5 0 0 1 . 0 0 0 0 . 5 0 0 o u t p u t v o l t a g e p i n # f u n c t i o n 1 2 3 4 5 6 7 8 9 1 0 f a c t o r y c a l i b r a t i o n i i n c u r r e n t i n p u t g r o u n d v r e f 1 . 2 5 v o l t r e f e r e n c e g r o u n d + 5 v o l t s v c c a l i b r a t i o n i n p u t - 5 v o l t s v o v o l t a g e o u t p u t f a c t o r y c a l i b r a t i o n 2 9 6 8 4 7 3 , 5 t h e p i g t a i l e d p h o t o d i o d e a n d d n 1 3 5 a s s e m b l y i s c a l i b r a t e d b y i n t r o d u c i n g a n o p t i c a l s i g n a l o f k n o w n m a g n i t u d e i n t o t h e f i b e r a n d a d j u s t i n g t h e c a l i b r a t i o n p o t e n t i o m e t e r s o t h a t t h e o u t p u t v o l t a g e c o r r e s p o n d s t o t h e i n p u t p o w e r l e v e l . e x a m p l e : o n e h u n d r e d m i c r o w a t t s o f o p t i c a l p o w e r @ 1 5 5 0 n m i s i n t r o d u c e d i n t o a f i b e r t h a t i s t e r m i n a t e d i n a n i n g a a s p h o t o d i o d e . * a d j u s t t h e c a l i b r a t i o n c o n t r o l s h o w n i n f i g u r e 1 u n t i l t h e o u t p u t v o l t a g e i n d i c a t e s 3 . 5 0 0 v o l t s . t h e o p t i c a l p o w e r m o n i t o r i s n o w c a l i b r a t e d a t 1 5 5 0 n m . t h e c a l i b r a t i o n c o n t r o l c a n b e d r i v e n f r o m a n e x t e r n a l v o l t a g e s o u r c e s u c h a s t h e o u t p u t o f a d i g i t a l t o a n a l o g c o n v e r t e r . t h i s w o u l d a l l o w t h e p o w e r m o n i t o r t o b e a u t o m a t i c a l l y c a l i b r a t e d i n a s y s t e m s a p p l i c a t i o n . * a t y p i c a l i n g a a s p h o t o d i o d e m a y h a v e a r e s p o n s i v i t y o f 0 . 9 m a / m w a t t o f o p t i c a l p o w e r a t 1 5 5 0 n m . t h i s w o u l d p r o v i d e a n o u t p u t o f c u r r e n t o f 9 0 m a w i t h a n i n p u t p o w e r o f 1 0 0 m w . t h e c a l i b r a t i o n c o n t r o l c o r r e c t s f o r v a r i a t i o n s i n t h e r e s p o n s i v i t y o f v a r i o u s p h o t o d i o d e s . p i n = 2 0 ( v o - 4 ) d b m v o e q u a t i o n r e l a t i n g o p t i c a l p o w e r i n p u t p i n t o o u t p u t v o l t a g e v o . e x a m p l e : v o = 2 . 7 5 0 v o l t s p i n = 2 0 ( 2 . 7 5 0 - 4 ) = - 2 5 d b m f i g u r e 1 o p t i c s 1 2 3 4 5 9 8 7 6 1 0 0 . 1 0 0 " 0 . 6 5 0 " 0 . 5 5 " 0 . 0 5 0 " p a g e 1
v o = l o g ( i i n ) + 4 2 + 4 v c + ( i i n ) a n t i - l o g e l e m e n t x 4 0 . 8 7 5 v 3 . 5 6 k w ? o u t p u t 9 2 i n p u t 1 0 - 1 0 1 0 - 9 1 0 - 8 1 0 - 7 1 0 - 6 1 0 - 5 1 0 - 4 1 0 - 3 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 2 5 2 5 2 5 2 5 2 5 2 5 2 5 2 5 i n p u t c u r r e n t ( a m p e r e s ) o u t p u t v o l t a g e ( v o l t s ) o u t p u t v o l t a g e v s . i n p u t c u r r e n t / o p t i c a l p o w e r - 7 0 - 6 0 - 5 0 - 4 0 - 3 0 - 2 0 - 1 0 0 - 7 0 - 6 0 - 5 0 - 4 0 - 3 0 - 2 0 - 1 0 0 o p t i c a l i n p u t p o w e r ( d b m ) v c 7 4 v r e f + 5 v 1 . 2 5 v r e f . v o 6 8 3 5 v d d + 5 v v e e - 5 v i i n g n d . g n d . 1 . 2 5 v o l t s c a l i b r a t i o n a d j u s t m e n t 1 0 k w 6 . 8 1 k w f u n c t i o n a l b l o c k d i a g r a m o t t h e d n 1 3 5 e q u a t i o n r e l a t i n g t h e o u t p u t v o l t a g e o f t h e d n 1 3 5 t o t h e i n p u t c u r r e n t . v o = l o g ( i i n ) 2 + 5 . 5 + ( i i n ) w h e n v c = 0 . 8 7 5 v i i n i s i n a m p e r e s o r i n p u t c u r r e n t a m p e r e s v o l t s 1 1 0 0 1 0 1 1 0 0 1 0 1 m a m a m a m a n a n a n a 1 0 0 p a 4 . 0 0 0 3 . 5 0 0 3 . 0 0 0 2 . 5 0 0 2 . 0 0 0 1 . 5 0 0 1 . 0 0 0 0 . 5 0 0 o u t p u t v o l t a g e 1 + 0 . 0 1 2 0 . 0 0 2 0 . 0 0 0 0 . 0 0 1 0 . 0 0 2 0 . 0 0 2 0 . 0 0 2 0 . 0 0 5 v o l t s o u t p u t v o l t a g e t o l . 1 . t h i s i s t h e o u t p u t v o l t a g e a f t e r t h e d n 1 3 5 h a s b e e n c a l i b r a t e d t o p r o d u c e a n o u t p u t v o l t a g e o f 3 . 0 0 0 v o l t s w i t h a n i n p u t c u r r e n t o f 1 0 m a a t a n a m b i e n t t e m p e r a t u r e o f 2 5 c . 1 o u t p u t v o l t a g e v s . i n p u t c u r r e n t f o r t h e d n 1 3 5 t = 2 5 c t = 2 5 c + 0 . 0 2 4 0 . 0 1 0 0 . 0 1 0 0 . 0 1 0 0 . 0 1 0 0 . 0 1 0 0 . 0 2 0 0 . 1 5 0 v o l t s o u t p u t v o l t a g e t o l . 1 t = - 2 0 c t o + 7 5 c = 0 . 0 1 0 . 0 0 2 a t 2 5 c . t h e e f f e c t o f o n t h e o u t p u t v o l t a g e i s v e r y s m a l l w h e n t h e i n p u t c u r r e n t i s l e s s t h a n 1 0 0 m a . p a g e 2 l a s t u p d a t e d 6 / 2 5 / 0 1 1 0 0 4 m a l l o r y w a y c a r s o n c i t y , n v 8 9 7 0 1 p h o n e : 7 0 2 - 8 8 2 - 7 7 2 1 f a x : 7 0 2 - 8 8 2 - 7 6 7 5 e - m a i l : i n f o @ t h e r m o p t i c s . c o m h t t p : / / w w w . t h e r m o p t i c s . c o m


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