ADuCRF101 decoupling capacitors


Are there general requirements for the decoupling capacitors on IOVDD like there are for many other pins on the ADuCRF101 (see the datasheet)?

Does the ADuCRF101 really need 8 decoupling capacitors in parallel? Instead of having 4 0.1 uF caps and 4 100 pF caps in parallel, why not just have 1 0.4 uF and 400 pF cap in parallel? If my memory serves me right, there are different valued caps in parallel because there are different frequencies of noise to suppress? I am a little new to picking out the right decoupling parts, but that is the only explanation or reason I can even remember that makes slight sense.