Microchip LN-CSAC-SA65 handleiding
Handleiding
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LN-CSAC Model SA65-LN User’s Guide
2024 Microchip Technology Inc. and its subsidiaries DS50003805A-page 21
FIGURE 2-6: Time-interval Counter Performance.
Figure 2-6 illustrates the transition of the TIC output (Phase telemetry parameter) from
fine to coarse measurement as PPSOUT is swept through Phase = 0. For this data,
PPSOUT was synchronized to PPSEXT prior to time = 0. Absolute Frequency Steers
of ±1E-8 were applied to the LN-CSAC at times 25 sec., 175 sec., and 475 sec.
2.9 1 PPS SYNCHRONIZATION
The rising edge of the 1 PPS output is synchronous with one rising edge of the RF out-
put (pin 3). The 1 PPS output may be synchronized with a particular cycle of the RF by
applying a synchronization pulse to PPSEXT (pin 9). When synchronized, the counters
are reset such that the 1 PPS output occurs on the RF rising edge, which is immedi-
ately subsequent to the externally applied rising edge. In this way, the LN-CSAC 1 PPS
can be synchronized to within one clock cycle (–100 ns to +100 ns) of the external ref-
erence.
During the synchronization process, the length of the second immediately following the
next rising edge of PPSEXT is adjusted to accomplish synchronization. In the case
where PPSEXT appears ahead of PPSOUT by <0.5 seconds, the subsequent epoch
may be extended by up to 0.5 seconds. In the case where PPSEXT appears following
PPSOUT by <0.5 seconds, the subsequent epoch is shortened by up to 0.5 seconds.
The LN-CSAC provides two modes for 1 PPS synchronization, Manual and Automatic,
which are selected through a bit in the mode register (see Section 3.3.3 “Set/Clear
Operating Modes (M)”).
Note: Synchronization has the effect of a one-time alignment between incoming
and outgoing PPS signals. For sustained alignment, the Discipling mode is
recommended instead.
Note: The configuration of the mode register is non-volatile (preserved across
power cycles).
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Productinformatie
| Merk | Microchip |
| Model | LN-CSAC-SA65 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 6392 MB |
