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ADS9218: When is the internal S/H circuit sampling the input vs holding the value and converting it?

Part Number: ADS9218

Tool/software:

We're using a sample hold circuit ahead of the 9218 and then performing 2 conversions and averaging the result.  Is there a timing diagram that notes when the A/D is sampling it's input so I can assure that my input signal is in a valid state?  In the diagram below the green trace is the raw signal, the red line is the output of my S/H and ideally, I'd like to align the ADS9218 to sample at the red x marks.