How does the adc work in a max2769?

Question

In the datasheet it is mentioned that the ADC can be configured to 3-bits for I-channel, now did this become 3-bit sigma-delta ADC?. 
 Why is the max sampling rate only 50Msps?, there's hardly any room for oversampling. If my rf bandwidth is around 10Mhz i can hardly get 2 more bits from oversampling and assuming it is a second-order sigma-delta adc. 
 is there a way to get atleast a 10-bit resolution?

RFP · Accepted Answer

Hi Rahul, 
 Please use external ADC to the analog output of MAX2769 for higher sampling rate. 
 
 Thank You. 
 RF Products support team.)

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How does the adc work in a max2769?