资 源 简 介
The nLiten BBT3821 is a fully integrated octal 2.488Gbps to3.1875Gbps Clock and Data Recovery (CDR) circuit andReTImer ideal for high bandwidth serial electrical or opTIcalcommunicaTIons systems. It extracts TIming information anddata from serial inputs at 2.488Gbps to 3.1875Gbps,covering 10 Gigabit Fiber Channel (10GFC) and IEEE 802.3specified 10 Gigabit Ethernet eXtended Attachment UnitInterface (XAUI) rates.Each BBT3821 accepts two sets of four high-speeddifferential serial signals, re-times them with a localReference Clock, reduces jitter, and delivers eight cleanhigh-speed signals. The BBT3821 provides a full-functionXAUI-to-10GBASE-CX4 PMA/PMD (compatible with theIEEE 802.3ak specification), and also can be configured toprovide the electrical portion of a XAUI-to-10GBASE-LX4PMA/PMD, needing only laser drivers and photo detectors tobe added. In both these applications, the XAUI side can beconfigured to implement the XENPAK MSA_R3.0specification, including full NVR and DOM support. TheXPAK and X2 specifications currently all reference theXENPAK specification, and are supported in exactly thesame manner. The BBT3821 can also be used to enhance asingle full-duplex 10 Gigabit XAUI link, extending the drivingdistance of the high-speed (2.488Gbps to 3.1875Gbps)differential traces to 40 inches of FR4 PCB (assuming aproper impedance-controlled layout).
