The AD6649 is an IF Diversity Receiver with integrated Digital Filtering/NCO Tuning features. The AD6649/AD9643 models are externally pin-compatible and share the same physical Eval Brd Layout, but the AD9643 is a straight full bandwidth dual-channel ADC without the integrated DDC features.
Due to this key difference, customers wishing to evaluate the AD6649 need to purchase the EVB model populated with the AD6649 device.
After reviewing with our Mkt Team it appears the AD6649 EVB is discontinued. The AD6649 ADC device model is still in production. Customers desiring to evaluate the AD6649 are advised to purchase the AD9643 EVB and swap out the ADC with the pin-compatible AD6649 model. The recommended migration path for the AD6649 device is the newer AD9684 which has an actively supported EVB avail.