ZHCSON7A July 2021 – October 2024 ADC12DJ800-Q1 , ADC12QJ800-Q1 , ADC12SJ800-Q1
PRODUCTION DATA
The TMSTP+ and TMSTP– differential input can be used as a time-stamp input to mark a specific sample based on the timing of an external trigger event relative to the sampled signal. The TMSTP± input is retimed to the internal sampling clock and can be repeated out of the TRIGOUT± output to trigger external devices, such as a laser driver, when TRIGOUT_EN is set to 1 to enable the TRIGOUT± output and TRIGOUT_MODE is set to 3. The TMSTP± input can also be sent over the JESD204C interface to mark a specific ADC sample. TIME_STAMP_EN must be set in order to output the timestamp data. When enabled, the timestamp signal is sent over the JESD204C interface in place of the LSB of the JESD204C mode sample size (based on N' parameter in Table 6-16, Table 6-17 and Table 6-18). For example, in JMODE 0 the JESD204C sample size (N') is 12 and therefore the timestamp information is sent at LSB ([0]) bit location and the 12-bit sample (truncated to 11-bits) is sent in the [11:1] bit location. The input applied to TMSTP± can be asynchronous to the ADC sampling clock and is sampled at approximately the same time as the analog input. Effectively, the TMSTP± input acts as a 1-bit ADC sampled in parallel with the ADC cores and both have matched latency through the device. The TMSTP± input must be enabled (TMSTP_RECV_EN) to use the timestamp feature.