Microchip LN-CSAC-SA65 handleiding
Handleiding
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LN-CSAC Model SA65-LN User’s Guide
DS50003805A-page 18 2024 Microchip Technology Inc. and its subsidiaries
To overcome the software steering limit of ±2 × 10
–8
, the frequency latch command
(!FL) may be employed (for more information, see Section 2.6.1 “Frequency Cali-
bration”). Ultimately, the LN-CSAC steering capability is physically limited by the
EMXO tuning voltage. An alarm will trigger when this voltage is breached.
Frequency steering is volatile. Upon reboot, the LN-CSAC returns to its nominal (cali-
brated) frequency setting. To update the non-volatile calibration, use the Frequency
Latch command (Section 3.3.2 “Frequency Adjustment (F)”).
The current steering value appears in the telemetry string as Steer.
To apply a frequency correction from Clockstudio, click on the Frequency Adjustment
tab, then select relative or absolute from the pull-down menu and enter the desired
steering into the Digital Tune field in ×10
–15
.
Figure 2-3 shows an example where an absolute correction of -100000 ×10
–15
is
entered. The correction is applied to the LN-CSAC when Apply is selected.
FIGURE 2-3: Absolute Frequency Adjustment.
As shown in Figure 2-3, after Apply is clicked, the correction is applied to the LN-CSAC
and the value of Steer changes (on the next polling update) to indicate the internal cor-
rection of –100 × 10
–12
.
Note: Steering commands can only be entered when the unit is locked (Status=0).
Steering commands entered when Status ≠ 0 are ignored.
Note: Steer reports the actual hardware steering, in units of ×10
–12
, even though
the software registers maintain resolution of ×10
–15
, so that many small rel-
ative corrections may be applied. As a result, the reported value may
appear to disagree with the applied correction in the lowest digit due to
roundoff error. An example is provided in Section 3.3.2 “Frequency
Adjustment (F)”.
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Productinformatie
| Merk | Microchip |
| Model | LN-CSAC-SA65 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 6392 MB |
