Microchip LN-CSAC-SA65 handleiding
Handleiding
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LN-CSAC Model SA65-LN User’s Guide
DS50003805A-page 20 2024 Microchip Technology Inc. and its subsidiaries
The PPSOUT signal is derived by digital division of the RF reference frequency. The
frequency stability and accuracy of PPSOUT reflects that of the RF output. When
unlocked (BITE = 1, status ≠ 0), PPSOUT stability reflects that of the free-running
EMXO.
Control of PPSOUT signal, synchronization, and disciplining is provided on the 1 PPS
Disciplining tab in Clockstudio. The 1 PPS Disciplining tab is shown in Figure 2-5.
FIGURE 2-5: 1 PPS Disciplining Tab.
The output pulse width (PPSWidth) of PPSOUT can be set to a value between 10 µs
and 500,000 µs in increments of 10 µs by adjusting PPSWidth (See
Section 3.3.10 “Set PPSWidth (>)”). To adjust PPSWidth from Clockstudio, enter the
new value (in nanoseconds) into the Pulse Width field and click Apply.
2.8 TIME-INTERVAL COUNTER
The LN-CSAC accepts a user-supplied 1 PPS input reference signal as an input on pin
9 (PPSEXT). The LN-CSAC time-interval counter (TIC) measures the time interval (TI)
between the rising edges of PPSOUT and PPSEXT. The TIC measurement is reported
in the telemetry field “Phase” (see Section 3.3.1 “Telemetry (6 and ^)”), where the
sign convention is (Phase = PPSEXT – PPSOUT), i.e. a negative value of Phase indi-
cates that PPSOUT occurs after PPSEXT by Phase ns.
For values of Phase outside the range of ±800 ns the TIC reports Phase with resolution
of 100 ns (10 MHz LN-CSAC). For values of Phase within ±800 ns, the TIC reports
Phase with resolution of 1 ns.
The TIC operates whenever a rising edge appears on PPSEXT. If no PPSEXT is
detected for more than 2 seconds, the TIC reports “---” in the telemetry Phase field.
Upon initial startup, prior to any synchronization between PPSOUT and PPSEXT, the
TIC will report the (unsynchronized) Phase on the range of ±0.5 seconds (±500000000
ns).
Note: The increments of PPSWidth are under the assumption of a 10 MHz
LN-CSAC. For an LN-CSAC with a different output frequency, consult the
datasheet for the available increments of PPSWidth.
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Productinformatie
| Merk | Microchip |
| Model | LN-CSAC-SA65 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 6392 MB |
