Safran VersaSync - 1 PPS Output

Oscillator Type Accuracy
mRO-50 1x10
-12
typical 24-hour average locked to GPS
5x10
-12
per day typical aging unlocked
Table 1-10:
10 MHz output — oscillator stability
Oscillator
Type
Short-Term Stability (Allan variance)
Relative Frequency Variation
with Temperature (0°C to
60°C)
1sec. 10sec. 100 sec.
OCXO 1x10
-9
1x10
-10
3x10
-11
±5x10
-8
mRO-50 4 x 10
-11
1.3 x 10
-11
4 x 10
-12
4x10
-10
Table 1-11:
10 MHz output — oscillator phase noise (dBc/Hz)
Oscillator Type @ 10Hz @ 100Hz @ 1KHz @ 100KHz
OCXO ˗120 dBc/Hz ˗140 dBc/Hz ˗150 dBc/Hz ˗155 dBc/Hz
mRO-50 ˗90 dBc/Hz ˗110 dBc/Hz ˗135 dBc/Hz ./.
For more information, see "Configuring the Oscillator" on page223.
1.7.3.2 1PPS Output
Signal: One pulse-per-second square wave (ext. reference connected to GNSS
receiver)
Signal level: TTL compatible, 4.3 V minimum, base-to-peak into 50 Ω
Pulse width: Configurable pulse width (200 ms by default)
Pulse width range: 20 ns to 900 ms
Rise time: <10 ns
Accuracy: Positive edge within ±50 ns of UTC when locked to a valid 1PPS input
reference
Table 1-12:
1PPS output accuracies
Oscillator
Type
1PPS Accuracy to UTC
(1 sigma, locked to
GPS)
Holdover (constant temp. after 2weeks of GPS
lock)
After 4 hours After 24 hours After 7 days
OCXO ±50 ns 3 μs 40 μs 1.2 ms
mRO-50 ±50 ns 0.2 μs 1.5 μs 20 μs
20
CHAPTER 1 • VersaSync User Manual Rev. 12
1.7 VersaSync Specifications