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 19
Figure 2-4 shows an example of relative frequency tuning after absolute steer is reset
to 0. In this example, each time Apply is clicked, an additional correction of –100000 ×
10
–15
is applied to the LN-CSAC. In this screen shot, Apply has been clicked a total of
four times. The resultant value of Steer is –400 × 10
–12
.
FIGURE 2-4: Relative Frequency Adjustment.
2.6.1 Frequency Calibration
The internal frequency calibration of the LN-CSAC is set prior to shipment. The calibra-
tion may need to be updated from time to time to remove cumulative frequency aging
off- sets.
Calibration of the LN-CSAC is a two-step process. First, the LN-CSAC is steered onto
frequency, either through an external !F command (see Section 2.6 “Frequency
Adjustment”) or through 1 PPS disciplining (see Section 2.10 “1 PPS Disciplin-
ing”). Second, the present value of Steer is summed into the non-volatile calibration
register through the Frequency Latch command (see Section 3.3.2 “Frequency
Adjustment (F)”). Following a Latch command, the value of Steer resets to zero.
To latch the current steer value to non-volatile storage from Clockstudio, click Latch.
2.7 1 PPS OUTPUT
A CMOS level 1 pulse-per-second (1 PPS) output is available on pin 10 upon power-up
(PPSOUT). The output series impedance is 200Ω. Nominal levels are 0VDC to
3.3VDC. For synchronization purposes, the on-time point is the rising edge of pin 10.
Note: The Latch command is only valid when the LN-CSAC is locked (Status = 0).
Note: It may be tempting, particularly in disciplining applications, to frequently
latch the steering value into calibration in the event of unforeseen power
outage. This is highly discouraged for the following reason. The lifetime of
the LN-CSAC's non-volatile memory is finite; updating it >20,000 times will
damage it and render the LN-CSAC inoperable.
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Productinformatie
| Merk | Microchip |
| Model | LN-CSAC-SA65 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 6392 MB |
