Updated example of DelSig-ADC->Filter->VDAC can be found here
Streaming data to the UART is not that straightforward. First, UART won't handle full-speed ADC sampling speed. At 115k it can transfer approx. 10k bytes/sec. For 2-bytes per 16-bit sample, that is 5k samples/sec, which is much slower than DAC.
Can you describe the goal of the project? What are you planning to do with UART stream? What software you going to use to consume UART data?