The GN1157 is a multi-rate transceiver IC designed specifically for datacom and telecom applications. The

transmit DFB/FP laser driver is an advanced design that is focused on delivering excellent optical performance

while still achieving low power. Programmable equalisation is available to optimise jitter. The Tx output has

programmable rise/fall times to allow optimization for different bit rates. The GN1157 features an integrated

automatic power control loop that adjusts bias current to compensate for laser aging and environment change.

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Integrated closed-loop Automatic Power Control (APC)

Compatible with microcontroller-based modulation current/temperature look-up table

Programmable Tx eye shaping features and input equalization

Measurement of digital diagnostic and monitoring parameters

2-wire serial interface for host communication

Software-selectable power-down modes

3.3V or 2.5V CMOS inputs and open-drain outputs for control and status lines

This specification defines a multi-rate transceiver IC for use in a wide range of LR Ethernet and Fibre

Channel applications from 1.0Gb/s to 11.3Gb/s. This includes 1Gb/s and 10Gb/s Ethernet data rates as

defined by IEEE 802.3 and 1,2,4,8 and 10Gb/s Fibre Channel data rates.

Block Diagram