Transwitch (TranSwitch Corporation ) : TXC-02624

CDR

The CDR VLSI device is a monolithic clock and data recovery component that receives NRZ data, extracts the high-speed clock, and presents the separated data and clock as its outputs. This device is designed specifically for SONET OC12 and SDH STM4 applications at 622 Mbit/s. The device contains a phase-locked loop (PLL) that generates a stable 622.08 Mbit/s reference clock output based upon an external 38.88 MHz TTL reference clock input. The PLL is based on a VCO constructed from integrated reactive components, which form a low-jitter/high-Q differential tank circuit. Both frequency- and phase-detect circuitsreliably acquire and hold lock in worst-case input jitter conditions and scrambling patterns. The lock-detect circuitry signals when the CDR acquires frequency lock.

• Single-chip CDR circuit for 622 Mbit/s data
• Exceeds Bellcore and ITU jitter tolerance map requirements
• Single-ended ECL input has loop-through path for external 50 ohm termination to minimize stubs and reflections
• Clock and data outputs are differential ECL
• External loop filter requires simple passive network
• Maintains clock in absence of data
• Can be used with a high-speed external clock

Technology:	unknown
Package:	unknown 0 Pin