I need to design a non-inverting amplifier with gain from 1 (unity) to 15. From what I read, in theory this can be achieved by using a pot as the feedback resistor, but in practice this will only work depending on the open-loop gain of the op-amp. Below is the circuit which I intend to use, using the AD8544 as an op-amp on single supply and RV1 used to set the gain from unity to 15. The input signal will have Vcc/2 as the base reference, hence why R1 is connected to Vcc/2. Input frequency can be anywhere from 5 to 600Hz.
The datasheet of the AD8544 shows a graph of the open-loop gain VS frequency (figure 30). Does this graph show that the gain could be up to 40dB for frequencies 5 to 600Hz ?
Is there anything which can be improved in the circuit shown below?