Hi Chip, The line regulation specification for the internal reference for this device is a DC PSRR specification - so only valid at DC. Some of our products do publish a curve for AC PSRR, but that's largely implemented in the newer datasheets. I will have to look internally to see if any curve exists for the DAC7563 and get back to you. Please give me a couple of days for that. What I can offer in the short-term is that typically PSRR has rolled off by 1MHz to ~10dB and stays fairly flat from there. I would not expect anything significantly different for this device. In the case of our device datasheets typically this curve is basically published just for the signal chain / output stage and uses an external reference. I'm not sure that I've seen the same kind of curve ever published for an internal reference.
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