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Multirate common-cathode driver

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article image Multirate 1Gbps to 4.25Gbps VCSEL driver.

MAXIM Integrated Products, represented in Australia by Arrow Electronics , has released the MAX3795 3.3V, multirate common-cathode 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 TIA and MAX3794 limiting amplifier, the MAX3975 forms a complete chipset for 1Gbps to 4.25Gbps optical modules.

Manufactured using Maxim's 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 suitable for SFP and SFF-8472 compatible shortwave optical modules. When coupled with the DS1859/DS1856 SFP controller ICs, the VCSEL driver meets all SFF8472 digital diagnostics and timing requirements.

It operates from a single 3.3V supply and 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 52ps. It generates 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 from -40°C to 85°C.

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