Spectracom TPRO-cPCI, Руководство пользователя, Страница: 20 / 46

TPRO-cPCI/TSAT-cPCI Spectracom Corporation
Synchronizable Timecode Generator User Manual 3-4
Table 3.9—Time Tag Input
Time Between Each Rising Edge 500 uS min
Repetition Rate 2000 events/second max
Time Tag Accuracy ± 1 uS
Table 3.10—1PPS Output
Connector DB-15 TIMING, pins 13(+) and 12(–)
Output Type Differential RS-422
Recommended Termination 120 ohms, ½ watt, line-to-line
On-Time Edge Rising
Time base Error Same as on-board clock
Differential Output Voltage 3.0 Vp-p typical into 120 ohms
Output Skew (pin 13 to pin 12) 5 nS typical
Pulse Width 4 uS typical
Table 3.11—Oscillator Output
Connector DB-15 TIMING, pins 8(+) and 15(–)
Output Off, 1 kHz, 1 MHz, 5 MHz, or 10 MHz (programmable)
Power-on Default Frequency Off
Output Type Differential RS-422
Wave Shape Square wave, 40%/60% duty cycle
Recommended Termination 120 ohms, ½ Watt, line-to-line
Differential Output
(into 120 ohms)
2.5 Vp-p (1 kHz or 1 MHz)
2.0 Vp-p (5 MHz)
1.7 Vp-p (10 MHz)
Output Skew (pin 8 to pin 15) 5 nS typical
Cable Length* (1 kHz or 1 MHz) 76 m (250 ft) max
Cable Length* (5 MHz) 23 m (75 ft) max
Cable Length* (10 MHz) 3 m (10 ft) max
Spectracom recommends a 22 AWG twisted, shielded pair cable. Connect shield to
connector shell.
Table 3.12—Heartbeat Output
Connector DB-15 TIMING, pin 14
Wave Shape Pulse
Pulse Polarity Programmable
Pulse Width 100 nS, 333 nS, 1 uS, or 1 mS (Programmable)
Output Voltage (high) 2.4 V min at 2.5 mA
Output Voltage (low) 0.4 V max at –2.5 mA
Output Current (high or low) 2.5 mA max
Range 200 nS to 65.5 Seconds
Power-on Default Disabled