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Multi Chip ADRV9026 Frequency change time

Category: Datasheet/Specs
Product Number: ADRV9026

We have an configuration of two ADRV9026 chips synchronized. From other forum questions it seem like the frequency changing time can be as large as 6ms using the internal synthesizer. Can the frequency changing time be optimized using a fast external LO (<100us change time) with this 2x ADRV9026 set-up? Will the 2x ADRV9026 chip set-up still be coherent (in phase) after the LO division by 2 in the different chips?