This document describes a fiber optic receiver with quantizer, clock recovery, and data retiming functionalities, manufactured by Analog Devices. The product meets the requirements of CCITT G.958 for STM-4 regenerator-Type A and also complies with Bellcore TR-NWT-000253 for OC-12 output jitter.
The AD808 is a fiber optic receiver designed to provide data quantization, signal level detection, clock recovery, and data retiming for 622 Mbps Non-Return-to-Zero (NRZ) data. It meets CCITT G.958 requirements for STM-4 Regenerators—Type A and Bellcore TR-NWT-000253 requirements for OC-12 output.
Key features include low jitter performance of 2.5 degrees RMS, single supply operation at +5 V or –5.2 V, and programmable level detect range from 10 mV to 40 mV. The device utilizes a Phase-Locked Loop (PLL) with no crystal required for frequency acquisition.
| Data Rate | 622 Mbps |
|---|---|
| Output Jitter | 2.5 Degrees RMS |
| Quantizer Sensitivity | 4 mV |
| Power Supply Voltage | +5 V or –5.2 V |
| Low Power Consumption | 400 mW |
The AD808 meets CCITT G.958 Requirements for STM-4 Regenerator—Type A.
No, the device uses a Phase-Locked Loop that acquires frequency without requiring external components such as a crystal.