MAX3935 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 10.7Gbps EAM Driver

19-4803; Rev 1; 12/02
10.7Gbps EAM Driver
General Description
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.
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.
The driver can modulate EAM devices at amplitudes up
to 3.0V_P-P when the device impedance is 50Ω. Typical
(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.
The MAX3935 also includes an adjustable pulse-width
control circuit to precompensate for asymmetrical EAM
characteristics.
Applications
SONET OC-192 and SDH STM-64
Transmission Systems
DWDM
Metro and Long-Haul Transmitters
Add/Drop Multiplexers
Features
o Single -5.2V Power Supply
o Low 110mA Supply Current
o 34ps Typical Rise/Fall Time
o Up to 10.7Gbps (NRZ) Operation
o On-Chip Termination Resistors
o Programmable Modulation Voltage Up to 3.0V_P-P
o Programmable EAM Bias Voltage Up to 1.2V
o Adjustable Pulse-Width Control
o Selectable Data Retiming Latch
o Modulation Enable Control
o ESD Protection
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3935EGJ
-40°C to +85°C 32 QFN-EP*
MAX3935E/D
-40°C to +85°C Dice**
*EP = exposed pad.
**Dice are designed to operate over this range, but are tested and
guaranteed at T_A = +25°C only. Contact factory for availability.
For the latest package outline information, go to
www.maxim-ic.com/packages.
Pin Configuration appears at end of data sheet
Typical Application Circuit
VBIASREF
DATA+
DATA-
MAX3952
10Gbps SERIALIZER
CLK+
CLK-
-5.2V
-5.2V
BIASMON
BIASSET GND
50Ω
DATA+
MODN1
50Ω
DATA-
MOD
MAX3935
MODN2
VTT
EAM
50Ω
50Ω
VOUT
50Ω
CLK+
50Ω
CLK-
BIAS
L
PWC+ PWC- MODEN RTEN MODMON MODSET VEE
RPWC
2kΩ
-5.2V
-5.2V
100pF
100Ω -5.2V
-5.2V
REPRESENTS A CONTROLLED–IMPEDANCE TRANSMISSION LINE
†_{Covered by U.S. patent number 5,883,910.}
VMODREF
-5.2V
-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.