The only difference between 2305 and 2305B is that 2305B has better cycle-to-cycle jitter performance.

The 2305B has less than 175 ps of max cycle-to-cycle jitter, while 2305 has less than 200 ps of max cycle-to-cycle jitter. The 2305B also has a typical cycle-to-cycle jitter of 50 ps. 

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