ad43057xp or AD9243AS replacement

Hello,

My scanner uses AD43057xp or AD9243AS depends on serial number. These are old AD converters. Can you help find new better converters (16-bits) that could work without much change in board layout? Here is the board:

https://drive.google.com/file/d/0ByP8kkW_h00uYm5vWDJnOTEwS0U/edit?usp=sharing

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