An ADC has a dynamic range of 60dB and is preceded by a
Butterworth low-pass filter that has a 3dB frequency of 1KHz and 25dB
loss at 3KHz. This arrangement is to be used for analogue to digital
conversion from 0 to 3KHz.

1 The number of bits the ADC should have

2 The order of filter required

3 The minimum sample frequency