Slew Rate Calculation
If you are sampling at 1.5&nbsp;MHz, the time taken for your analogue amplifier to slew its output has to be a bit quicker than the reciprocal of 1.5&nbsp;MHz i.e. 0.667&nbsp;µs. If it has to deliver a change of 10&nbsp;V in this period then the slew rate, as a minimum must be:

\$\dfrac{10\ V}{0.667\ \mu s}\$ = 15 V per micro second.

You also need to look at the op-amp's settling time - this is not encapsulated within the slew rate figure, and the settle time is usually specified to within the voltage reaching its target to an accuracy of 0.1%. If you are using a 10-bit ADC, 0.1% could be 1&nbsp;LSB.