MAX3940| Datasheet

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19-2730; Rev 0; 1/03

10Gbps EAM Driver with Integrated Bias Network
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 40mA P-P to 120mAP-P, with an edge speed of 23ps (typical, 20% to 8
0%). 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
o On-Chip Bias Network o 23ps Edge Speed o Programmable Modulation Voltage Up to 3VP-P o Programmable EAM Biasing Voltage Up to 1.25V o Selectable Data-Retiming Latch o Up to 10.7Gbps Operation o Integrated Modulation and Biasing Functions o 50 On-Chip Input and Output Terminations o Pulse-Width Adjustment o Enable and Polarity Controls o ESD Protection

MAX3940

Ordering Information
PART MAX3940E/D TEMP RANGE -40 C to +85 C PIN-PACKAGE Dice*

*Dice are designed to operate over a -40 C to +120 C junction temperature (TJ) range, but are tested and guaranteed at TA = +25 C only.

Applications
SONET OC-192 and SDH STM-64 Transmission Systems DWDM Systems Long/Short-Reach Optical Transmitters 10Gbps Ethernet

Typical Application Circuit
-5.2V

0.01uF DATA+ 0.01uF 50 DATA+

PLRT

MODEN

RTEN

GND EAM

MAX3952
10Gbps SERIALIZER

DATA-

50

DATA-

0.01uF CLK+ 0.01uF CLK50 CLKPWC+ 2k PWC50 CLK+

MAX3940
OUT 50

MODSET + VMODSET -

BIASSET + VBIASSET -

VEE

-5.2V -5.2V 330pF 0.1uF

-5.2V

REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE.

________________________________________________________________ Maxim Integrated Products

1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.

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MAX3940 DATASHEET