High-speed ADC for non-uniform sampling

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Q 
 We need to sample data with 12 bit non uniform. Preferred at a sample rate between 200MHz and 400MHz. Maybe we will be happy if it work between 100MHz - 200 MHz. Is this possible? If yes, which converters are able to handle this non uniform clock? What are the disadvantages? 
 
 A 
 This is possible and could be used when you have the waveform you would like to digitize such that parts of the waveform that require greater timing resolution get sampled at higher rate than parts of the waveform that have "less information" hence can be sampled/digitized at lower rate. Since samples are collected into a memory array, you would need to have time stamp also that shows at what point the sample rate was changed (also taking into account the pipeline latency of ADC). You would need to select an ADC capable of at least 500 MSPS. The AD9434 would be the only 12-bit ADC at 500 MSPS that could be suggested at this time. However there is one concern -> the main problem with non-uniform sampling would be for our converters that have a clock duty cycle stabilizer (DCS) that cannot be disabled. The DCS on the AD9434 cannot be disabled therefore it has to be discounted. There is another device which can support 500MSPS and the DCS can be disabled -> AD9286, so this device could be suggested. Please note that it is interleaved and 8-bit.

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AD9286: FAQ