Multirate VCSEL driver focuses on optical modules for Ethernet, Fibre-channel apps

Sunnyvale, CA — Maxim Integrated Products introduces the MAX3795 +3.3V, multirate common-cathode vertical cavity surface-emitting laser (VCSEL) driver with automatic power control. The MAX3975 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 transimpedance amplifier (TIA) and MAX3794 limiting amplifier, the MAX3975 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 small form-factor pluggable (SFP) and SFF-8472 compatible shortwave optical modules. When coupled with the DS1859/DS1856 (contact company for this future product) SFP controller ICs, this new VCSEL driver meets all SFF-8472 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 current mode logic- (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 degrees Celsius to +85 degrees Celsius). Prices start at $5.50 (1000-up, FOB USA). An evaluation kit is available to speed designs.

Small-form pluggable board with Maxim VCSEL driver

A data sheet for the MAX3795 is available on the web.

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