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ADN2865 Datasheet(PDF) 17 Page - Analog Devices |
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ADN2865 Datasheet(HTML) 17 Page - Analog Devices |
17 / 33 page Preliminary Technical Data ADN2865 Rev. PrA | Page 17 of 33 JITTER SPECIFICATIONS The ADN2865 CDR is designed to achieve the best bit-error- rate (BER) performance and exceeds the jitter transfer, genera- tion, and tolerance specifications proposed for SONET/SDH equipment defined in the Telcordia Technologies specification. Jitter is the dynamic displacement of digital signal edges from their long-term average positions, measured in unit intervals (UI), where 1 UI = 1 bit period. Jitter on the input data can cause dynamic phase errors on the recovered clock sampling edge. Jitter on the recovered clock causes jitter on the retimed data. The following sections briefly summarize the specifications of jitter generation, transfer, and tolerance in accordance with the Telcordia document (GR-253-CORE, Issue 3, September 2000) for the optical interface at the equipment level and the ADN2865 performance with respect to those specifications. JITTER GENERATION The jitter generation specification limits the amount of jitter that can be generated by the device with no jitter and wander applied at the input. For OC-48 devices, the band-pass filter has a 12 kHz high-pass cutoff frequency with a roll-off of 20 dB/decade, and a low-pass cutoff frequency of at least 20 MHz. The jitter generated must be less than 0.01 UI rms, and must be less than 0.1 UI p-p. JITTER TRANSFER The jitter transfer function is the ratio of the jitter on the output signal to the jitter applied on the input signal versus the frequency. This parameter measures the limited amount of the jitter on an input signal that can be transferred to the output signal (see Figure ). 0.1 ACCEPTABLE RANGE fC JITTER FREQUENCY (kHz) SLOPE = –20dB/DECADE Figure 17. Jitter Transfer Curve JITTER TOLERANCE The jitter tolerance is defined as the peak-to-peak amplitude of the sinusoidal jitter applied on the input signal, which causes a 1 dB power penalty. This is a stress test intended to ensure that no additional penalty is incurred under the operating conditions (see Figure ). 15.00 1.50 0.15 f0 f1 f2 f3 f4 JITTER FREQUENCY (kHz) SLOPE = –20dB/DECADE Figure 18. SONET Jitter Tolerance Mask |
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