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XRT7295AT Datasheet(PDF) 10 Page - Exar Corporation |
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XRT7295AT Datasheet(HTML) 10 Page - Exar Corporation |
10 / 18 page XRT7295AT 10 Rev.1.20 OUTPUT JITTER The total jitter appearing on the RCLK output during normal operation consists of two components. First, some jitter appears on RCLK because of jitter on the incoming signal. (The next section discusses the jitter transfer characteristic, which describes the relationship between input and output jitter.) Second, noise sources within the XRT7295AT device and noise sources that are coupled into the device through the power supplies and data pattern dependent jitter due to misequalization of the input signal, all create jitter on RCLK. The magnitude of this internally generated jitter is a function of the PLL bandwidth, which in turn is a function of the input 1s density. For higher 1s density, the amount of generated jitter decreases. Generated jitter also depends on the quality of the power supply bypassing networks used. Figure 12 shows the suggested bypassing network, and Table 5 lists the typical generated jitter performance. Figure 7. Loss Characteristic of 728A Coaxial Cable (450 ft.) Figure 8. Phase Characteristic of 728A Coaxial Cable (450 ft.) 12 10 8 6 4 2 0 1.0 2.0 5.0 10 20 50 100 Frequency (MHz) 100 80 60 40 20 0 1.0 2.0 5.0 10 20 50 100 Frequency (MHz) JITTER TRANSFER CHARACTERISTIC The jitter transfer characteristic indicates the fraction of input jitter that reaches the RCLK output as a function of input jitter frequency. Table 5 shows Important jitter transfer characteristic parameters. Figure 9 also shows a typical characteristic, with the operating conditions as described in Table 5. Although existing standards do not specify jitter transfer characteristic requirements, the XRT7295AT information is provided here to assist in evaluation of the device. Parameter Typ Max Unit Generated Jitter1 All 1s pattern 1.0 ns peak-to-peak Repetitive “100” pattern 1.5 ns peak-to-peak Jitter Transfer Characteristic2 Characteristic2 Peaking 0.05 dB Peaking f 3dB 0.05 205 dB kHz Notes 1 Repetitive input data pattern at nominal DSX-3 level with VDD = 5V TA = 25°C. 2 Repetitive “100 ” input at nominal DSX-3 level with VDD = 5V, TA = 25°C. Table 5. Generated Jitter and Jitter Transfer Characteristics |
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