19-4803; Rev 1; 12/02
10.7Gbps EAM Driver
General Description
Features
o Single -5.2V Power Supply
The MAX3935 is designed to drive an electro-absorp-
tion modulator (EAM) at data rates up to 10.7Gbps. It
provides programmable output levels through external-
ly adjustable bias and modulation currents. This EAM
driver is fabricated with Maxim’s in-house second-gen-
eration SiGe process.
o Low 110mA Supply Current
o 34ps Typical Rise/Fall Time
o Up to 10.7Gbps (NRZ) Operation
o On-Chip Termination Resistors
The MAX3935 accepts differential ECL or ground-refer-
enced CML clock and data-input signals. Inputs are
terminated with on-chip 50Ω resistors. An input-data
retiming latch can be used to reject input-pattern-
dependent jitter if a clock signal is available.
o Programmable Modulation Voltage Up to 3.0V
o Programmable EAM Bias Voltage Up to 1.2V
o Adjustable Pulse-Width Control
o Selectable Data Retiming Latch
o Modulation Enable Control
P-P
The driver can modulate EAM devices at amplitudes up
to 3.0V
when the device impedance is 50Ω. Typical
P-P
o ESD Protection
(20% to 80%) edge speeds are 34ps. The output has
an on-chip 75Ω resistor for back termination. The
MAX3935 allows for an EAM bias voltage up to 1.2V.
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 QFN-EP*
Dice**
The MAX3935 also includes an adjustable pulse-width
control circuit to precompensate for asymmetrical EAM
characteristics.
MAX3935EGJ
MAX3935E/D
*EP = exposed pad.
**Dice are designed to operate over this range, but are tested and
Applications
SONET OC-192 and SDH STM-64
Transmission Systems
guaranteed at T = +25°C only. Contact factory for availability.
A
For the latest package outline information, go to
www.maxim-ic.com/packages.
DWDM
Metro and Long-Haul Transmitters
Add/Drop Multiplexers
Pin Configuration appears at end of data sheet
Typical Application Circuit
V
BIASREF
-5.2V
-5.2V
EAM
BIASMON
BIASSET GND
50Ω
DATA+
DATA-
DATA+
DATA-
50Ω
50Ω
MODN1
V
OUT
MOD
50Ω
MAX3935
MODN2
MAX3952
10Gbps SERIALIZER
CLK+
V
TT
CLK+
50Ω
50Ω
BIAS
V
L
CLK-
CLK-
100pF
PWC+ PWC- MODEN RTEN MODMON
MODSET
EE
R
PWC
2kΩ
-5.2V
100Ω
-5.2V
-5.2V
-5.2V
V
MODREF
-5.2V
-5.2V
REPRESENTS A CONTROLLED–IMPEDANCE TRANSMISSION LINE
†
Covered by U.S. patent number 5,883,910.
________________________________________________________________ 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.