Bandwdith of AD6684

Question

Hi, 
 I have a very basic question regarding bandwidth of AD6684 IF Receiver. The specifications document says it's a 135MHz Quad IF receiver. The block diagram of the receiver shows, 4 paths each consisting of a 500MS/s ADC, and DDC with NSR and VDR options available. Each DDC has 4 half band filters so with one half band filter enabled, output IQ rate would be 250MS/s and the alias rejected band is of 200MHz. What does 135MHz bandwidth represent then ? I see no filter even before ADC in the block diagram. What is the significance of this 135MHz Bandwidth ? 
 
 Thanks

PeeveeS · Accepted Answer

Hi Sun786, Thank you for your interest in AD6684. You can relate the 135MHz BW from the 2nd mode of the NSR. At 491.52Msps, 28% BW Mode is around 135MHz. Best regards, Peevee)

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