HS DACs, such as 9122, 9125, 9783 etc. have very high glitch energy (in time-domain plots observed on an oscilloscope) when the analog output is measured at the DAC output pins. Is this normal? What is the cause of this?
As explained in detail on this forum (on another question), many of our DACs use a proprietary DAC switching technique called the quad-switch. This removes code-dependent clock spurs and creates a constant high-energy spur at 2*Fs. In the time-domain, the unfiltered DAC output will have high-energy glitches due to this reason.
Since these glitches reside at 2*Fs, the analog filter following the DAC should be able to attenuate them significantly. Note that on products such as the 9707 (which do not use this switching technique), the unfiltered DAC output will look a lot "cleaner" in the time domain.
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