Microchip LN-CSAC-SA65 handleiding
Handleiding
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LN-CSAC Model SA65-LN User’s Guide
DS50003805A-page 24 2024 Microchip Technology Inc. and its subsidiaries
FIGURE 2-7: PPS Discipling.
Figure 2-7 shows an example of Disciplining with DisciplineTau = 600 and
DiscOKthreshold = 20. As Discipline steered both phase and frequency to 0 with a 600
sec. time constant, Discipline periodically re-synced PPSOUT to PPSEXT in order to
maintain Phase within ±100 ns. DiscOK transitioned from 0 to 1 when Phase < 20 ns
for two 600-second time constants.
2.10.1 Cable Length Compensation
The zero point of disciplining can be adjusted to accommodate cable and other instru-
mentation delays (or advances) which impact the arrival time of the PPSEXT at the
LN-CSAC 1 PPS input pin. The compensation value can optionally be stored in the
LN-CSAC non-volatile RAM for persistent calibration.
The maximum compensation adjustment is ±25 ns, with resolution of 100 ps. The com-
pensation value is entered into the LN-CSAC as a signed integer in units of 100 ps,
where positive sign indicates phase advancement of the input 1 PPS. For example, if
there is 10 ns of delay (approximately 2 meters of RG-58 coaxial cable) between the
on-time point and the LN-CSAC 1 PPS input then the compensation value would be
+100.
Compensation is set with the !DC command (see Section 3.3.6 “Set Volatile 1 PPS
Disciplining Time Constant (d)”).
2.11 POWER CONTROL
LN-CSAC time-to-lock (TTL) from cold start is limited by the need to initially warm-up
the central core of the physics package which, in turn, is limited by the power supply
capacity. TTL may be reduced at the expense of additional power draw during
warm-up, based on the user-specified HeaterBoostLimit.
Note: Compensation is implemented in the disciplining algorithm, not in the TIC
itself. The phase measurement, as reported through telemetry, reports the
actual phase measurement, that is, if the LN-CSAC is disciplined with +10
ns of compensation, the phase meter reports –10 ns of phase error.
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Productinformatie
| Merk | Microchip |
| Model | LN-CSAC-SA65 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 6392 MB |
