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General Description

The MAX3940 is designed to drive an electro-absorption modulator (EAM) at data rates up to 10.7Gbps. It incorporates the functions of a biasing circuit and a modulation circuit, with integrated control op amps externally programmed by DC voltages.

The integrated bias circuit provides a programmable biasing current up to 50mA. This bias current reflects a bias voltage of up to 1.25V on an external 50? load. The bias and modulation circuits are internally connected on chip, eliminating the need for an external bias inductor. A high-bandwidth, fully differential signal path is internally implemented to minimize jitter accumulation. When a clock signal is available, the integrated data-retiming function can be selected to reject input-signal jitter.

The MAX3940 receives differential CML signals (ground referenced) with on-chip line terminations of 50?. The output has a 50? resistor for back termination and is able to deliver a modulation current of 40mAP-P to 120mAP-P, with an edge speed of 23ps (typical, 20 to 80). This modulation current reflects an EAM modulation voltage of 1.0VP-P to 3.0VP-P.

The MAX3940 also includes an adjustable pulse-width control circuit to precompensate for asymmetrical EAM characteristics.

Features

? On-Chip Bias Network

? 23ps Edge Speed

? Programmable Modulation Voltage Up to 3VP-P

? Programmable EAM Biasing Voltage Up to 1.25V

? Selectable Data-Retiming Latch

? Up to 10.7Gbps Operation

? Integrated Modulation and Biasing Functions

? 50? On-Chip Input and Output Terminations

? Pulse-Width Adjustment

? Enable and Polarity Controls

? ESD Protection

Applications

?? SONET OC-192 and SDH STM-64 Transmission Systems

?? DWDM Systems

?? Long/Short-Reach Optical Transmitters

?? 10Gbps Ethernet