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Maxim Integrated Products - 10Gbps EAM Driver

Numéro de référence MAX3940
Description 10Gbps EAM Driver
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products 





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MAX3940 fiche technique
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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-absorp-
tion 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 50load. 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 50resistor 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 modula-
tion 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 50On-Chip Input and Output Terminations
o Pulse-Width Adjustment
o Enable and Polarity Controls
o ESD Protection
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3940E/D
-40°C to +85°C
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
DATA+
MAX3952 DATA-
10Gbps
SERIALIZER
CLK+
CLK-
0.01µF
0.01µF
0.01µF
0.01µF
PLRT MODEN RTEN
GND
50DATA+
50DATA-
EAM
50CLK+
MAX3940
OUT
50
-5.2V
CLK-
PWC+
PWC-
2k
MODSET BIASSET
+
VMODSET
-
+
VBIASSET
-
VEE
-5.2V
REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE.
50
330pF
0.1µF
-5.2V
________________________________________________________________ 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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