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AD800-52BR PDF预览

AD800-52BR

更新时间: 2024-11-19 22:05:23
品牌 Logo 应用领域
亚德诺 - ADI 时钟
页数 文件大小 规格书
12页 255K
描述
Clock Recovery and Data Retiming Phase-Locked Loop

AD800-52BR 数据手册

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Clock Recovery and Data Retiming  
Phase-Locked Loop  
a
AD800/AD802*  
FUNCTIO NAL BLO CK D IAGRAM  
FEATURES  
Standard Products  
C
D
44.736 Mbps—DS-3  
51.84 Mbps—STS-1  
155.52 Mbps—STS-3 or STM-1  
Accepts NRZ Data, No Pream ble Required  
Recovered Clock and Retim ed Data Outputs  
Phase-Locked Loop Type Clock Recovery—No Crystal  
Required  
Random J itter: 20؇ Peak-to-Peak  
Pattern J itter: Virtually Elim inated  
10KH ECL Com patible  
COMPENSATING  
ZERO  
LOOP  
DATA  
INPUT  
Ø
DET  
FILTER  
VCO  
RECOVERED  
CLOCK  
f
OUTPUT  
DET  
RETIMED  
DATA  
OUTPUT  
RETIMING  
DEVICE  
Single Supply Operation: –5.2 V or +5 V  
Wide Operating Tem perature Range: –40؇C to +85؇C  
AD800/AD802  
FRAC  
OUTPUT  
P RO D UCT D ESCRIP TIO N  
During the process of acquisition the frequency detector  
provides a Frequency Acquisition (FRAC) signal which  
indicates that the device has not yet locked onto the input data.  
T his signal is a series of pulses which occur at the points of cycle  
slip between the input data and the synthesized clock signal.  
Once the circuit has acquired frequency lock no pulses occur at  
the FRAC output.  
T he AD800 and AD802 employ a second order phase-locked  
loop architecture to perform clock recovery and data retiming  
on Non-Return to Zero, NRZ, data. T his architecture is  
capable of supporting data rates between 20 Mbps and 160  
Mbps. T he products described here have been defined to work  
with standard telecommunications bit rates. 45 Mbps DS-3 and  
52 Mbps ST S-1 are supported by the AD800-45 and  
AD800-52 respectively. 155 Mbps ST S-3 or ST M-1 are  
supported by the AD802-155.  
T he inclusion of a precisely trimmed VCO in the device  
eliminates the need for external components for setting center  
frequency, and the need for trimming of those components. T he  
VCO provides a clock output within ±20% of the device center  
frequency in the absence of input data.  
Unlike other PLL-based clock recovery circuits, these devices  
do not require a preamble or an external VCXO to lock onto  
input data. T he circuit acquires frequency and phase lock using  
two control loops. T he frequency acquisition control loop  
initially acquires the clock frequency of the input data. T he  
phase-lock loop then acquires the phase of the input data, and  
ensures that the phase of the output signals track changes in the  
phase of the input data. T he loop damping of the circuit is  
dependent on the value of a user selected capacitor; this defines  
jitter peaking performance and impacts acquisition time. T he  
devices exhibit 0.08 dB jitter peaking, and acquire lock on  
random or scrambled data within 4 × 105 bit periods when  
using a damping factor of 5.  
T he AD800 and AD802 exhibit virtually no pattern jitter, due  
to the performance of the patented phase detector. T otal loop  
jitter is 20° peak-to-peak. Jitter bandwidth is dictated by mask  
programmable fractional loop bandwidth. T he AD800, used for  
data rates < 90 Mbps, has been designed with a nominal loop  
bandwidth of 0.1% of the center frequency. T he AD802, used  
for data rates in excess of 90 Mbps, has a loop bandwidth of  
0.08% of center frequency.  
All of the devices operate with a single +5 V or –5.2 V supply.  
*P r otected by U.S. P atent No. 5,027,085.  
REV. B  
Inform ation furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assum ed by Analog Devices for its  
use, nor for any infringem ents of patents or other rights of third parties  
which m ay result from its use. No license is granted by im plication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.  
Tel: 617/ 329-4700  
Fax: 617/ 326-8703  

AD800-52BR 替代型号

型号 品牌 替代类型 描述 数据表
ADF4210BRU ADI

完全替代

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