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 17
At the conclusion of the acquisition sequence (status = 0), BITE remains high for an
additional 5 seconds to avoid false indication in the event of acquisition failure. Subse-
quently, BITE provides an immediate (within 2 seconds) indication of lock failure or
alarm.
2.4 RF OUTPUT CHARACTERISTICS
The sine wave output is provided on pin 3 of the LN-CSAC. The output series imped-
ance is 50Ω. For reference, the output driver circuit of the LN-CSAC is shown in the
following illustration.
FIGURE 2-2: CSAC RF Output Driver Circuit.
The RF output appears on pin 3 after the LN-CSAC is powered ON and is always pres-
ent, regardless of the lock status. When the LN-CSAC is out of lock (BITE = 1, status
≠ 0), the output frequency is provided by the free-running TCXO. Typically, the
unlocked frequency accuracy during acquisition is significantly better than <1 × 10
–8
as
the LN-CSAC memorizes its last-known-good tuning voltage and restores this voltage
upon power-up and/or subsequent recovery from loss-of-lock.
2.5 WHAT TO EXPECT DURING FIRST POWER-UP
The LN-CSAC output frequency is calibrated prior to shipment. However, the shipment
conditions may affect the absolute frequency offset when received by the end-user due
to temperature excursions, vibration, duration of transit, and so on. As such, some fre-
quency offset should be expected when the LN-CSAC is first powered on by the user.
Off- sets may be corrected, as explained in Section 2.6 “Frequency Adjustment”.
2.6 FREQUENCY ADJUSTMENT
For external steering and/or calibration, the LN-CSAC internal microwave synthesizer
may be adjusted by the user through the !F command (see Section 3.3.2 “Frequency
Adjustment (F)”). Steering values are entered in (integer) units of 1 × 10
–15
, though
the resolution realized by the LN-CSAC hardware is approximately 1 × 10
–12
. Steering
commands may be entered as either absolute steers (!FA) or as relative steers (!FD).
In the case of an absolute steer, the contents of the steer register are replaced with the
new value. In the case of a relative steer, the new value is summed with the existing
value in the steer register. In either case, the maximum steer that can be applied to the
LN-CSAC is ±2 × 10
–8
(±2000000000 × 10
–15
). If a larger value is sent to the LN-CSAC,
the maximum allowed steer is applied.
Note: Clockstudio
TM
software is a graphical interface provided for communication
and evaluation of LN-CSAC. To display the functionality of the LN-CSAC,
screen shots of Clockstudio are included in the sections that follow. For
more information on Clockstudio, refer to the Clockstudio User’s Guide.
See Section 4.4 “Clockstudio Software Information” for installation.
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Productinformatie
| Merk | Microchip |
| Model | LN-CSAC-SA65 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 6392 MB |
