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AD421 HART Noise during silence

Question asked by kuno123 on Apr 2, 2015
Latest reply on May 4, 2015 by msamera

We use the AD421 with a HART Modem. No we have problems with the HART noise
during silence requirement. The AD421 produces an excessive noise level. We
don't use the internal regulator of th AD421. The filtering / coupling is done
according to AN-534.
The noise seems to come from the internal sigma/delta DAC.
Do you have recommendations to lower the internal noise of the AD421 ?