10Gbps Clock and Data Recovery with Limiting Amplifier
10Gbps Clock and Data Recovery (CDR) with Limiting Amplifier IC for XFP Optical Receivers
DescriptionThe MAX3991 is a 10Gbps clock and data recovery (CDR) with limiting amplifier IC for XFP optical receivers. The MAX3991 and the MAX3992 (CDR with equalizer) form a signal conditioner chipset for use in XFP transceiver modules. The chipset is XFI compliant and offers multirate operation for data rates from 9.95Gbps to 11.1Gbps.
The MAX3991 has 7mVP-P input sensitivity (BER < 10-12), which allows direct connection to a transimpedance amplifier without the use of a stand-alone limiting amplifier. The phase-locked loop (PLL) is optimized for jitter tolerance and provides 0.6UI of high-frequency tolerance in SONET, Ethernet, and Fibre-Channel applications. The MAX3991 output provides 27% margin to the XFP eye mask specification.
An AC-based power detector toggles the loss-of-signal (LOS) output when the input signal swing is below the user-programmed assert threshold. An external reference clock, with frequency equal to 1/64 or 1/16 of the serial data rate is used to aid in frequency acquisition. A loss-of-lock (LOL) indicator is provided to indicate the lock status of the receiver PLL.
The MAX3991 is available in a 4mm x 4mm, 24-pin QFN package. It consumes 350mW from a single +3.3V supply and operates over the 0°C to +85°C temperature range.
- 10.3Gbps/11.1Gbps Ethernet XFP Transceivers
- 10.5Gbps Fibre Channel XFP Transceivers
- 10Gbps DWDM Transceivers
- 9.95Gbps to 11.1Gbps Optical XFP Modules
- SONET OC-192/SDH STM-64 XFP Transceivers
Technical DocumentsApp Note 3766 HFTA-12.0: Measuring Crosstalk Penalty in High-Speed Bidirectional Serial Communication Modules
App Note 3432 MAX3991: Accurate Loss-of-Signal Detection in 10Gbps Optical Receivers using the MAX3991
Tools & Models
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