I am using AD8347 IQ demodulator for upto 35MHz application and AD9284 dual ADC. Is it recommended to have any driver ciruit in between or can it be directly connected?
You should be able to use AD8347 to drive the AD9284 directly without an additional driver in between. You may also want to look at the integrated baseband output amplifier specs on the AD8347 and see if the performance is acceptable. If not you can consider to use a high performance external driver. See Figure 49 in the AD8347 or Figure 19 and 20 in AD9284 datasheet for external driver examples.
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