That's a quite wide topic... and I'm not so sure it is only targeting analog IC, as most of the processing is done in the digital domain. Essentially (on the analog side) it only consists of a standard DAC (tx) and ADC (rx) as well as analog band-select/reconstruction filters. You can definitely find ICs for those parts.
Further on, xDSL utilize DMT which is more or less OFDM. In this case there is no need for mixers, instead you will transmit/receive data in the baseband directly.
On the digital side it is a bit beyond me.