Hi Usaghi,
There is an ADI that I also wanted to suggest the 14-bit AD7944 and AD7357
The AD7944 is pseudo differential analog input voltage range from 0V to Vref, Vref upto 5V while the AD7357 is a dual 14-bit differential ADC, which allows simultaneous conversion with result available in separate or in succession data lines.
http://www.analog.com/static/imported-files/data_sheets/AD7357.pdf
http://www.analog.com/static/imported-files/data_sheets/AD7944.pdf
I think converting a single ended signal to differential, the differential signal cancels out common signal, which is the noise that are common in this signal. This is one of the advantage of having a differrential signal. Now if there is a need of using a single ended signal, I would suggest putting a driver/buffer amplfier and a filter at the ADC input.
Regards,
Jonathan