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TDC-GPX2 Datasheet(PDF) 38 Page - ams AG |
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TDC-GPX2 Datasheet(HTML) 38 Page - ams AG |
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38 / 77 page  Page 38 ams Datasheet Document Feedback [v1-03] 2017-Dec-18 TDC-GPX2 − Detailed Description Input Pins for Time Measurement The following diagram show the relevant input pins for the reference and the stops. Figure 39: Input Circuitry REFCLKP/N: Reference Clock Input The reference clock serves as universal time base. Due to internal averaging, the phase jitter of the reference clock is non-critical. The accuracy and drift of the reference clock also does not affect the proper working of GPX2 itself. But it will directly affect the quality of the time measurement results. REFOSCI/O: Quartz Driver as Reference Clock Note(s): The quartz is not mandatory for operation of GPX2. The quartz is just an optional source for the reference clock. It can be used instead of a clock signal at the reference clock pin. Therefore REFCLK pins should be disabled. With a quartz as reference clock usually the time difference between stops channels is relevant (see chapter “Calculation of Time Differences”). The use of COMMON_FIFO_READ and BLOCKWISE_FIFO_READ can help to measure and read out associated stop results together. + - PI N_ENA_REF RES CMO S_ INPUT 1 0 REFRESP REFRESN + - PI N_ENA_REF RES 1 0 REFCLKP REFCLKN 1 0 START_ RESET START REFOSCO REFCLK_BY_ XOSC CMOS_ INPUT REFOSCI + - PI N_ENA_ STOP4 CMO S_IN PUT 1 0 STOP4P STOP4N STOP4 HIT_ENA_STOP4 + - PI N_ENA_ STOP3 CMO S_IN PUT 1 0 STOP3P STOP3N STOP3 HIT_ENA_STOP3 + - PI N_ENA_ STOP2 CMO S_IN PUT 1 0 STOP2P STOP2N STOP2 HIT_ENA_STOP2 + - PI N_ENA_ STOP1 CMO S_IN PUT 1 0 STOP1P STOP1N STOP1 HIT_ENA_STOP1 + - PI N_ENA_DIS ABLE CMO S_IN PUT 1 0 DISABLEP DISABLEN |
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