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AD5700 Carrier Detect Off Timing issue

Question asked by swyang on Jul 21, 2014
Latest reply on Aug 13, 2014 by swyang

We are developing a industrial product with HART communication capability using AD5700-1. We have a problem when using this IC:

 

Please see the AD5700/AD5700-1: Low Power HART Modem Data Sheet, Page 9, Figure 6. Carrier Detect Off Timing:

 

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Please see the RXD signal marked by red oval, What generate this signal? Because the HART signal has already disappeared at this moment.

 

Thanks!

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