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Is ADA4851 a little slow to drive 40MHz ref in clock on AD9361?

Question asked by stevereine Employee on Nov 11, 2015
Latest reply on Nov 11, 2015 by tlili

 

The user guide for the AD9361 suggests using the ADA4851 op-amp to buffer the 1.3Vpp reference clock at 40MHz when used for baseband synchronization purposes. Looking at the datasheet for that part, figure 26 suggests that it has a ~150V/us slew rate for a 1.3Vpp output step. If I understand this correctly, this means the output rise time will be at least 8.66ns of a 12.5ns half-period. I’d be curious what that waveform looks like, and if that’s really the right part to use. I only have 1.8, 2.5, and 3.3V power rails to work with, and bonus points are available for any suggested AEC-Q100 parts.

 

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