ADN2815(Rev0) 데이터 시트보기 (PDF) - Analog Devices

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ADN2815
(Rev.:Rev0)

Continuous Rate 10 Mb/s to 1.25 Gb/s Clock and Data Recovery IC

Analog Devices 

JITTER SPECIFICATIONS

The ADN2815 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

ADN2815 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 SONET devices, 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 vs. 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 11).

ADN2815

0.1

ACCEPTABLE

RANGE

SLOPE = –20dB/DECADE

fC

JITTER FREQUENCY (kHz)

Figure 11. 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 12).

15.00

SLOPE = –20dB/DECADE

1.50

0.15

f0

f1

f2

f3

f4

JITTER FREQUENCY (kHz)

Figure 12. SONET Jitter Tolerance Mask

Rev. 0 | Page 11 of 24

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