AD9868 is the low costw,pin-2-pin compatible version AD9865, see below difference HlM 27p$d  
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(1)   AD9868 remove the IOUTG, in AD9865, the IOUTG also can output about 120mA current. L:x TX+  
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(2)   AD9858 limited internal VCO freq 80MHz~200MHz (support 20M~80MSPS data rate), and AD9865 can support 20MHz~200MHz ( 5M~80MSPS data rate). 3X$R+#GlZ  
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BTW， AD89007 is the new verison of AD9868