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AD7484 REFOUT

Question asked by rjm on Oct 31, 2016
Latest reply on Nov 8, 2016 by jcolao
  1. How much current can I draw from the internal reference (REFOUT)? With REFSEL floating with a 0.1uF cap to AGND, REFOUT drops to 1.9V volts with a 4.7K load (0.5ma). Table 10 says the REFOUT impedance is 1 ohm.
  2. Fig 10 in the data sheet indicates very flat temperature drift (approximately 2mv) but Table 1 says +/100mv. Please explain this difference. My tests here indicate it’s even worse than that. What typical temperature drift should I expect of the internal reference? Is the drift affected by the REFOUT load?

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