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ADS54J60: SYNC, SYSREF and LMFC Alignment Process

Part Number: ADS54J60


I have two questions:

1. In the ADS54J60 datasheet section 8.3.3 page 31 it says: "SYSREF is required to be a sub-harmonic of the local multiframe clock (LMFC) internal timing". However JESD204B spec allows for periodic, single shot, or pulsed periodic SYSREF. The datasheet says that SYSREF is clocked by device clock. If we were to use SYSREF as a single shot signal, what is the latency between SYSREF and first LMFC? See image below.

2. When do K28.5 symbols start transmitting? After SYNC drops as says in section 8.4.2.1 on page 40 or after first LMFC after SYSREF event as says in section 8.5.2.5.4 page 64 in the description for register 3h? See image below for reference.