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Using buffer as input stage


In my design, I'm using a 12-bit ADC with SPI communication output (AD7896). Before
that, I'm using Single 16-to-1 Multiplexer (ADG707). I'm measuring 0-5V slow change
DC levels. 

My question is should I use an op amplifier with gain 1 (buffer) before the mux? Can you recommend
one? What is the most recommended configuration for the buffer (high resistance
between the minus net to the output, parallel capacitor, high input resistance…-
I need the circuit to be the most robust it can be)