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Multirate 1Gbps to 4.25Gbps VCSEL Driver for SFF/SFP Ethernet and Fibre-Channel Applications
SUNNYVALE, CA-August 30, 2004-Maxim Integrated Products
(NASDAQ: MXIM) introduces the MAX3795 +3.3V, multirate common-cathode VCSEL driver with automatic power control. The MAX3795 operates from 1Gbps up to 4.25Gbps and can be used in Gigabit Ethernet, Fibre Channel, and OC-48 modules for short-reach applications. Along with the MAX3793 TIA and MAX3794 limiting amplifier, the MAX3795 forms a complete chipset for 1Gbps to 4.25Gbps optical modules. Manufactured using MAXIM's second-generation, in-house SiGe process, the MAX3795 has a small form-factor and excellent jitter performance. It is pin compatible with the MAX3740A, a 3.2Gbps VCSEL driver.
The MAX3795 is ideal for SFP and SFF-8472 compatible shortwave optical modules. When coupled with the DS1859/DS1856* SFP controller ICs, this new VCSEL driver meets all SFF8472 Digital Diagnostics and timing requirements.
Operating from a single +3.3V supply, the MAX3795 has a programmable bias current range of 1mA to 15mA and a programmable modulation current range of 2mA to 15mA. The device accepts differential CML-compatible inputs and incorporates an automatic average power control circuit. The MAX3795 has edge-speed transition times of only 52ps; it generates only 8.4ps deterministic jitter, and 0.5ps of random jitter. The VCSEL driver can be used in common-cathode as well as differential configurations. An optional peaking feature can improve VCSEL edge speed, if required.
Available in a 4mm x 4mm 24-pin QFN package, the MAX3795 operates over the extended temperature range (-40°C to +85°C). Prices start at $5.50 (1000-up, FOB USA). An evaluation kit is available to speed designs.
*Future product-contact factory for availability.
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