I am conditioning a +/-10V signal to 2.5V +/-1V for the input to an A/D converter (1.5V to 3.5V input range). One method is to use a 10 to 1 voltage divider and feed it to an op amp unity gain buffer, then, use another unity gain op amp with a 2.5V reference offset. This costs two op amps in noise and cost. Can I do the same thing with only one op amp by using a fractional gain of 1/10th by setting Rin to 10 times Rfeedback and putting the 2.5V reference on the non-inverting terminal? I proto'ed this using one op amp and it seems to work but I cannot find any information to verify the design concept for stability.