I have a project I am designing whose fundamental parts consist of sensors connected to a micro-controller. the micro-controller will then send the data out over an ethernet port using standard tcp/ip protocols. I have already created the a proof of concept for the project using an Arduino Yun, but ran into several issues when the libraries and apis that make the Arduino easy to use seem to have prevented me from directly manipulating the registers that control the Arduino's ADC. Additionally, the 10 bit ADC the Arduino has is less than ideal for the signal gathering I am doing. So, In rolling my own hardware I am having trouble designing the ethernet hardware due to my limited experience.

It would help me greatly if there were circuit designs I could use as a reference when designing my circuit. Therefore my question is does the 802.3 Ethernet standard have a set of recommended circuit designs in schematic and/or block diagram form or does it solely lay out the features and functions for the standard? It would also be a helpful if someone could point out some surface mount ICs commonly used in mass manufacture Ethernet socket designs. (besides the UART chip)