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The M02090 is a highly integrated, programmable burst-
mode laser driver with a limiting amplifier intended for
ONU/OLT applications up to 2.5 Gbps. The M02090
offers a single, flexible solution that addresses all PON
applications of BPON, GEPON and GPON.
Capable of independently driving 100 mA of modulation
current and 80 mA of bias current, the laser driver in the
M02090 can independently control bias and modulation
currents via the Eye-MinderTM, a dual closed-loop that
maintains the target extinction ratio by compensating
for laser aging, temperature, and voltage changes.
Open-loop and average closed-loop configurations are
also supported.
The limiting amplifier inputs in the M02090 have selec-
table bandwidth. The input sensitivity is less than 3 mV at
1.25 Gbps, and less than 6 mV at 2.5 Gbps. The positive
emitter-coupled logic (PECL) differential outputs achieve
full swing at the minimum specified input signal. Also
included are features such as programmable loss of
signal, received signal strength indication and JAM func-
tion, which can be used to squelch chatter on the
outputs when no signal is present.
Many features of the M02090 can be accessed through
a 2-wire interface by an external microcontroller or the
device can operate independently with an external
EEPROM.
The M02090 is offered in a compact 32 pin, 5mm X 5mm
QFN package and is specified over an extended operating
temperature range of -40ºC to +100ºC.
>Integrated 2.5 Gbps burst-
mode driver with limiting
amplifier
>Up to 100mA of modulation
current and 80mA of bias
current
>Dual 2-wire interface
enables operation inde-
pendently or with an
external microcontroller
>Dual digital closed-loop
architecture, enables real
time extinction ratio
control
>2.5 ns burst on/off time
>Extended temperature
range of -40
ºC
to +100
º
C
>
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General Information: (949) 579-3000
Headquarters – Newport Beach
4000 MacArthur Blvd., East Tower
Newport Beach, CA 92660-3007
02090-BRF-001-A
© 2006 Mindspeed Technologies™. All rights reserved. Mindspeed and the Mindspeed
logo are trademarks of Mindspeed Technologies. All other trademarks are the prop-
erty of their respective owners. Although Mindspeed Technologies strives for accu-
racy in all its publications, this material may contain errors or omissions and is subject
to change without notice. This material is provided as is and without any express or
implied warranties, including merchantability, fitness for a particular purpose and
non-infringement. Mindspeed Technologies shall not be liable for any special, indirect,
incidental or consequential damages as a result of its use.
• Fiber-to-the-Premises
• Passive Optical Networks
- BPON, GEPON and GPON
PPrroodduucctt AApppplliiccaattiioonnss
Output
Buffer OUTP
OUTN
IPIN
IBIAS
OUT
Input
Buffer
D
IN
N
D
IN
P
TX
Disable
DIS
V
CC3T
GND
Input
Buffer
BENN
BENP
Laser
Driver
Modulation and
Bias Current Control
Biasing
RxOUTP
RxOUTN
RSSI
PK-PK
ST
SET
LOS
Jam RxINN
Iref
RxINP
V
CC3R
Output
Buffer Limiting
Amplifier
Safety Logic
(Fault Detection) FAIL
RSSI
SCL_M
SDA_M
SCL _S
SDA _S ADC
Imod
GND
0
Temp
sensor
Slave Two-
wire
Interface
Master
Two-wire
Interface
Limiting
Amplifier
and
Laser
Driver
Control
Registers
O ffset Cancel Level
Detect
Comparator
Limiting Amplifier
Laser Driver
LOS
Threshold
POR
Figure 1: M02090 functional block diagram
