XRT7295AE
internally generated jitter is a function of the PLL
bandwidth, which in turn is a function of the input 1s
density. For higher 1s densities, the amount of gener-
atedjitterdecreases.Generatedjitteralsodependson
the quality of the power supply bypassing networks
used. Figure 8 shows the suggested bypassing net-
work, and Table 3 lists the typical generated jitter
performance achievable with this network.
Figure 4. Pulse Mask at the 34.368 Mbit/s Interface
Parameter
Value
Pulse Shape (Nominally Rectangular)
All marks of a valid signal must conform with the mask
(see Figure 4), irrespective of the sign
Pair(s) in Each Direction
One coaxial pair
75Ω Resistive
1.0V
Test Load Impedance
Nominal Peak Voltage of a Mark (Pulse)
Peak Voltage of a Space (No Pulse)
Nominal Pulse Width
0V +/-0.1V
14.55ns
Ratio of the Amplitudes of Positive and Negative Pulses
at the Center of a Pulse Interval
0.95 to 1.05
Ratio of the Widths of Positive and Negative Pulses
at the Nominal Half Amplitude
0.95 to 1.05
Table 2. E3 Pulse Specification at the Transmitter Output Port
Rev. 2.0.0
7