AD800 - ADI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

AD800
Manufacturer

ADI
ChipWorker Part#

CW480100310
Description

45 or 52Mbps Clock and Data Recovery IC
Documentation

Datasheet

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AD800 Specifications

Attribute	Attribute Value

Part Number	AD800
Manufacturer	ADI
ChipWorker Part#	CW480100310
Documentation	Datasheet
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Product Lifecycle Status	Active

Product Description

Product Details
The AD800 and AD802 employ a second order phase-locked loop architecture to perform clock recovery and data re timing on Non-Return to Zero, NRZ, data. This architecture is capable of supporting data rates between 20 Mbps and 160 Mbps. The products described here have been defined to work with standard telecommunications bit rates. 45 Mbps DS-3 and 52 Mbps STS-1 are supported by the AD800-45 and AD800-52 respectively. 155 Mbps STS-3 or STM-1 are supported by the AD802-155.
Unlike other PLL-based clock recovery circuits, these devices do not require a preamble or an external VCXO to lock onto input data. The circuit acquires frequency and phase lock using two control loops. The frequency acquisition control loop initially acquires the clock frequency of the input data. The phase-lock loop than acquires the phase of the input data, and ensures the phase of the output signals track changes in the phase of the output data. The loop damping of the circuit is dependent of the value of a user selected capacitor; this defines jitter peaking and performance and impacts acquisition time. The devices exhibit 0.08 dB jitter peaking, and acquire lock on random or scrambled data within 4 X 105 bit periods when using a damping factor of 5.
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. This 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.
The 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. The VCO provides a clock output within ±20% of the device center frequency in the absence of input data.
The AD800 and AD802 exhibit virtually no pattern jitter, due to the performance of the patented phase detector. Total loop jitter is 20° peak-to-peak. Jitter bandwidth is dictated by mask programmable fractional loop bandwidth. The AD800, used for data rates <90 Mbps, has been designed with nominal loop bandwidth of 0.1% of the center frequency. The 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.
### Features and Benefits
Standard Products
44.736 Mbps—DS-3
51.84 Mbps—STS-1
155.52 Mbps—STS-3 or STM-1
Accepts NRZ Data, No Preamble Required
Recovered Clock and Retimed Data Outputs
Phase-Locked Loop Type Clock Recovery—No Crystal Required
Random Jitter: 20° Peak-to-Peak
Pattern Jitter: Virtually Eliminated
10KH ECL Compatible
Single Supply Operation: –5.2 V or +5 V
Wide Operating Temperature
Range: –40°C to +85°C

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