Looking for ADC and DAC schematics

I chose this project for my university assignment:
. I completely forgot about the project, and now I only have 2 weeks left. To at least show that I’ve done something, I need PCB designs for ADC, DAC, and amplifier circuits. If you have any design, no matter what it is, that could help, I would really appreciate it if you could share it. Thank you in advance.
 
I know how to use Google but I don't know what I am looking for. I don't even understand what did you send to me. God knows how many sites I checked. Maybe I found what I need already but I don't have a single clue about circut design and its makes everything million times hard for me. I am not stupid I am just clueless and thats why I opened this thread.
 
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