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PCM-3291
8
3.5 TMARK
The TMARK pulse waveform is shown in Figure 1. This signal is a positive
logic , buffered CMOS level output pulse that transitions from a logic “low”
condition to a logic “high” at a 1 Hz rate. The TMARK output pulse rise time
is typically less than 2 nanoseconds and the pulse duration is typically 25.6
milliseconds.
Figure 1. GPS Receiver Time Mark Pulse Waveform.
3.6 10KHz clock
This is a 10KHz clock waveform that is synchronized to the UTC TMARK
pulse. The relationship between the 10KHz clock and the TMARK UTC pulse
is shown in Figure 2. This clock signal is a positive logic , buffered CMOS level
output.
Figure 2. 10KHz Clock/UTC TMARK Pulse Relationship
2.00V
ch1
M5.00ms ch1
3.56V
ch1 +Width
25.600ms
1
2.00V
ch3
M40us
ch2
1.28V
TMARK pulse
10KHz clock
ch2
2.00V
2
3
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