I have a doubt on taking pad dimensions in this below picture what is the pad width and height.any body kindly clear my doubt
Presuming you are looking for the land pattern (PCB footprint), then I believe this is the one you should use:



I performed a search for the Analog Devices package name and was able to find another of their components that used it, but actually included the land pattern in the datasheet.

In addition, Analog Devices application note AN-772 contains the information used to calculate the land pattern pad sizes:

https://www.analog.com/media/en/technical-documentation/application-notes/AN-772.pdf?doc=ADL5566.pdf