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ADN2819ACP-CML-RL Datasheet(PDF) 10 Page - Analog Devices |
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ADN2819ACP-CML-RL Datasheet(HTML) 10 Page - Analog Devices |
10 / 24 page ADN2819 Rev. B | Page 10 of 24 LOS RESPONSE TIME The LOS response time is the delay between the removal of the input signal and indication of loss of signal (LOS) at SDOUT. The ADN2819’s response time is 300 ns typ when the inputs are dc-coupled. In practice, the time constant of ac-coupling at the quantizer input determines the LOS response time. JITTER SPECIFICATIONS The ADN2819 CDR is designed to achieve the best bit-error- rate (BER) performance, and has exceeded the jitter transfer, generation, 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 UI (unit intervals), 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 summarize the specifications of the 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 ADN2819 performance with respect to those specifications. Jitter Generation 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 should be less than 0.01 UI rms and 0.1 UI p-p. Jitter Transfer 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 jitter on an input signal that can be transferred to the output signal (see Figure 11). SLOPE = –20dB/DECADE JITTER FREQUENCY (kHz) 0.1 fC ACCEPTABLE RANGE Figure 11. Jitter Transfer Curve Jitter Tolerance Jitter tolerance is defined as the peak-to-peak amplitude of the sinusoidal jitter applied on the input signal that causes a 1 dB power penalty. This is a stress test that is intended to ensure no additional penalty is incurred under the operating conditions (see Figure 12). Figure 13 shows the typical OC-48 jitter tolerance performance of the ADN2819. SLOPE = –20dB/DECADE f0 f1 f2 f3 f4 JITTER FREQUENCY (Hz) 15 1.5 0.15 Figure 12. SONET Jitter Tolerance Mask MODULATION FREQUENCY (Hz) 10 1k 100k 10M 100 10 0.1 1 100 10k 1M 1 ADN2819 OC-48 SONET MASK Figure 13. OC-48 Jitter Tolerance Curve |
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