Input/Output Specifications
Inputs
1PPS Input
Available through the timing connector, see Connectors & Pinouts for details.
- 1Hz pulse, rising edge or falling edge active (selectable)
- 100 ns minimum pulse width
- Amplitude: 0 V to +5.5 V input range, +0.8 VVIL, +2.0 VVIH
- Input impedance <150 pF capacitive
IRIG AM Input
Available through the timing connector, see Connectors & Pinouts for details.
- Accepts IRIG formats A, B, G; NASA36; IEEE 1344
- Amplitude: 500 mVp-p to 10 Vp-p
- Modulation ratio: 2:1 minimum, 6:1 maximum
- Input impedance: 10 kΩ minimum
- DC Common Mode Voltage: ±150 VDC maximum
- Input Stability: Better than 100 ppm
IRIG DCLS Input
Available through the timing connector, see Connectors & Pinouts for details.
- Accepts IRIG formats A, B, G; NASA36; IEEE 1344 pulse width codes (does not accept Manchester modulated codes)
- RS-485 differential input: –7V to +12 V common mode voltage input range, 200 mVp-p differential voltage threshold
- Single-ended input:
- +1.3 V VIL min, +2 V VIH max
- +1.45 V VIL typ, +1.85 V VIH typ
GPIO Inputs
Available through the timing connector, see Connectors & Pinouts for details.
-
Amplitude: 0V to +5.5 V input range, +0.8 VVIL, +2.0 VVIH
- Polarity (selectable): Positive or negative
- Input impedance: <150 pF capacitive
- 50 ns active pulse width minimum; 50 ns minimum between pulses
- Repetition rate. More than 10,000 events per second
- Resolution: 5 ns
Outputs
1PPS Output
Available through the timing connector, see Connectors & Pinouts for details.
- 1Hz pulse, rising edge or falling edge active (selectable)
- 40 ns to 900 ms active pulse width (selectable, 200 ms default)
- Rise time: <10 ns
- Signal level: TTL compatible, 4.3 Vmin, base-to-peak into 50 Ω
[PCIe only: TTL compatible, 2.2 V minimum, base-to-peak into high impedance] - Accuracy: Positive edge within ±[X] nanoseconds of UTC when locked to a valid 1PPS input reference (for [X], see table below).
1PPS output accuracy
10 MHz Output
10 MHz sine wave output from oscillator
Available through the timing connector, see Connectors & Pinouts for details.
- Output impedance: 50 Ω nominal
- Output load: 50 Ω minimum
- Output harmonics: < -40 dBc
- Output spurious: < -70 dBc
10 MHz LVDS Clocks via P2 Connector (VPX only)
- Four (4) LVDS differential pairs
- Impedance: 100 Ω
- Duty cycle: 50%
- Rise time: <10 ns
10 MHz output specifications
TCXO | OCXO | OCXO (Rugged Option, cPCI & VPX only) | |
---|---|---|---|
Accuracy (average over 24 hours when GNSS locked) | 1x10-11 | 5x10-12 | 2x10-12 |
Medium term stability
(without CPS after 2 weeks of GNSS lock) |
1x10-8/ day | 2x10-9/ day | 5x10-10/ day |
Phase noise (dBc/Hz) | |||
@1 Hz | — | –85 | — |
@10 Hz | — | –113 | –120 |
@100 Hz | –110 | –120 | –135 |
@1 KHz | –135 | –140 | –135 |
@10 KHz | –140 | –150 | –145 |
Signal wave form & levels | +13 dBm ±3dB into 50 Ω, BNC |
IRIG AM Output
Available through the timing connector, see Connectors & Pinouts for details.
- Output formats A, B, E (100 Hz, 1 kHz), G; NASA36; IEEE 1344
- Amplitude:
- 0.5 Vp-p to 6 Vp-p into 50 Ω, user settable
- 1Vp-p to 12 Vp-p into > 600 Ω
- Output impedance: 50 Ω nominal
- Output load: 50 Ω minimum
- Modulation ratio: 3:1 nominal
- Accuracy: ±2 to 200 microseconds (IRIG-format dependent)
IRIG DCLS Output
Available through the timing connector, see Connectors & Pinouts for details.
- Outputs formats: A, B, E, G; NASA36; IEEE 1344 pulse width codes (does not generate Manchester modulated codes)
- RS-485 differential signal:
- 1.8 Vmax common mode output voltage (RS-485 compatible)
- 1.5 Vmin to 3.3 V max differential output voltage swing
- Single-ended amplitude (100 Ω load):
- 0.5 VVOL max, +2.5 VVOH min (TTL compatible)
GPIO Outputs
Available through the timing connector, see Connectors & Pinouts for details.
Periodic Output:
- Amplitude: TTL compatible, 4.3 Vmin, base-to-peak into 50 Ω
[PCIe only: 2.2 V minimum, base-top-peak into high impedance] - Pulse width: 50 ns to 999 ms active pulse width, in 20 ns increments
- Period: 100 ns min, 60 s max, in 20 ns increments
- Polarity (selectable): Positive or negative
Time-Match/Alarm Output
- Amplitude: TTL compatible, 4.3 V minimum, base-to-peak into 50 Ω; 2.2 V minimum, base-to-peak into high-impedance
-
Range: 100 days in 5 ns steps