Part Number:AMC1304L05
Hello,
according to the datasheet (revision 2017) the AMC1304L05 has a fail safe function. §8.4.1. Fail-Safe Output says: "In the case of a missing high-side supply voltage (LDOIN), ..." "Therefore, the AMC1304 implements a fail-safe output function". We use this function successfully together with logic in an FPGA. It will trigger an error if the ADCs datastream does not toggle within 128 clock cycles.
The AMC1304L05 is specified for LDOIN between 4 to 18VDC. We use it with 5V generated by an digital isolator (ADuM64xx).
In our application we trigger an error, if the primary power rail for the isolators drops below 4V. In case of VCCprimary < 4.5V the isolators try to generate 5V but this is not guaranteed. It might be anything between below 4V (due to losses) up to 5V.
The word "missing" in the AMC1304L05 datasheet is somehow unclear, however, as it implies that this error function is only active when LDOIN = 0V.
In FMEA and hasard rate discussions the following question was asked. What is the behavior of the ADCs error function in case of 0V < LDOIN <4V. We could not find any information about this point in the datasheet. Does the error handler raise an error (no toggling of data lines) or is it simply unspecified and it is up to the user to supervise the power supply for LDOIN?
Thank You very much in advance for clarification
Robert