Is the AD9548 the only or the best part to use to produce a 1PPS low jitter pulse from an external 1PPS source Trible/UBlox etc.
please also take a look at the AD9545 and AD9544. The AD9544 should be the cheapest. It is from the same family as the AD9545, so please use the AD9545 data sheet as the reference. Its data sheet must be updated to be brought at the same level as the rev B of the AD9545.