Low-Power, Compact 2.5Gbps/2.7Gbps Clock-Recovery and Data-Retiming IC

 

Part Number	Replacement	Explanation

Description

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The MAX3873 is a compact, low-power 2.488Gbps/ 2.67Gbps clock-recovery and data-retiming IC for SDH/SONET applications. The phase-locked loop (PLL) recovers a synchronous clock signal from the serial NRZ data input. The input data is then retimed by this recovered clock, providing a clean data output. The MAX3873 meets all SDH/SONET jitter specifications, does not require an external reference clock to aid in frequency acquisition, and provides excellent tolerance to both deterministic and sinusoidal jitter. The MAX3873 provides a PLL loss-of-lock (LOL-bar) output to indicate whether the CDR is in lock. The recovered data and clock outputs are CML with on-chip 50Ω back terminations on each line. The clock output can be powered down if not used.

The MAX3873 is implemented in Maxim's second-generation SiGe process and consumes only 260mW at 3.3V supply (output clock disabled, low output swing). The device is available in a 4mm x 4mm 20-pin QFN exposed-pad package and operates from -40¡ÆC to +85¡ÆC.

MAX3873: Typical Application Circuit Enlarge+

Key Features

Fully Integrated Clock Recovery and Data Retiming

Power Dissipation: 260mW with +3.3V Supply

Clock Jitter Generation: 5mUI_RMS

Exceeds ANSI, ITU, and Bellcore SDH/SONET Jitter Specifications

Differential Input Range: 50mV_P-P to 1.6V_P-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

Loss-of-Lock Indicator

Differential CML Data and Clock Outputs

Operating Temperature Range: -40°C to +85°C

Applications/Uses

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