The AD807 provides the receiver functions of data quantization, signal level detect, clock recovery and data retiming for 155 Mbps NRZ data. The device, together with a PIN diode/preamplifier combination, can be used for a highly integrated, low cost, low power SONET OC-3 or SDH STM-1 fiber optic receiver.
The receiver front end signal level detect circuit indicates when the input signal level has fallen below a user adjustable threshold. The threshold is set with a single external resistor. The signal level detect circuit 3 dB optical hysteresis prevents chatter at the signal level detect output.
The PLL has a factory trimmed VCO center frequency and a frequency acquisition control loop that combine to guarantee frequency acquisition without false lock. This eliminates a reliance on external components such as a crystal or a SAW filter, to aid frequency acquisition.
- Meets Bellcore TR-NWT-000253 requirements for OC-3
- 155Mbps clock recovery and data retiming
- Accepts NRZ data, no preamble required
- 2mV quantizer sensitivity
- 2.0 degrees RMS output jitter
- 2.0mV to 30mV level detect range
- 170mW low power
- 10 KH ECL/PECL compatible output
- 16-lead narrow 150 mil SOIC package
- Phase-locked loop type clock recovery, no crystal required
- Meets CCITT G.958 Requirements for STM-1 regenerator, Type A
