Description

The MAX3873EGP+ is a compact, low-power 2.488Gbps/2.67Gbps clock-recovery and data-retiming IC for SDH/SONET applications. It is designed to recover a synchronous clock signal from the serial NRZ data input and provide a clean data output. The MAX3873EGP+ meets all SDH/SONET jitter specifications, does not require an external reference clock for frequency acquisition, and has excellent tolerance to both deterministic and sinusoidal jitter. It also features a PLL loss-of-lock (LOL) output to indicate lock status and offers CML with on-chip 50Ω back terminations on each line for recovered data and clock outputs. The clock output can be powered down if not used.

Specifications and features

• Power Dissipation: 260mW with +3.3V Supply
• Clock Jitter Generation: 5mUIRMS
• Exceeds ANSI, ITU, and Bellcore SDH/SONET Jitter Specifications
• Differential Input Range: 50mVP-P to 1.6VP-P
• Single +3.3V Power Supply
• PLL Fast Track (FASTRACK) Mode Available
• Clock Output Can Be Disabled
• Input Data Rate: 2.488Gbps or 2.67Gbps
• Selectable Output Amplitude
• Tolerates 2000 Consecutive Identical Digits
• Operating Temperature Range: -40°C to +85°C

Application Scenarios

• Switch Matrix Backplanes
• SDH/SONET Receivers and Regenerators
• Add/Drop Multiplexers
• Digital Cross-Connects
• SDH/SONET Test Equipment
• DWDM Transmission Systems

Comparison

Advantages:

- Compact and low-power design - Meets all SDH/SONET jitter specifications - Does not require an external reference clock - Tolerates deterministic and sinusoidal jitter well

Disadvantages:

- Clock output needs to be powered down if not used
- Limited input data rate options (only 2.488Gbps or 2.67Gbps)
- Operating temperature range is relatively narrow (-40°C to +85°C)