The MAX24002 is a complete laser driver transmitter
and limiting amplifier receiver for use within fiber optic
modules for SFP applications. A fully compliant SFP
module with digital diagnostics is realized when used
with a 2KB EEPROM and suitable optics. Alternatively, a
microcontroller is used in conjunction with the MAX24002;
however, this is not a necessity to achieve SFF-8472
compliance.
The 2.5Gbps limiting receive path features programmable
output swing control, rate selection, and OMA-based
loss-of-signal detection. Functions are also provided that
facilitate the implementation of APD biasing without the
need for an external DC-DC converter.
The laser driver has temperature-compensated modula-
tion control using a lookup table. Closed-loop control of
laser power incorporates tracking error compensation.
This is linked to a laser safety system which allows the
modulation and bias currents to be shut off in response
to a range of different fault conditions detected on-chip.
The MAX24002 is highly configurable from either
EEPROM or a low-cost microcontroller using a two-wire
interface.
Features
● 1.25Gbps to 2.5Gbps Limiting Receiver
● Integrated APD Bias Loop with Overvoltage and
Overcurrent Protection
● OMA-Based LOS Detection
● 1.25Gbps to 2.5Gbps Laser Driver
● CML, LVPECL-Compatible Inputs
● Open and Closed-Loop Bias Control
● Temperature-Compensated I
MOD
Control
● Highly Configurable Laser Safety System
● SFP MSA and SFF-8472 Digital Diagnostics
● Integrated Temperature Sensor
● External DAC, ADC, and PWM Interfaces
Functional Diagram
2.5Gbps LIMITING RECEIVER
RX_IN+
RX_OUT+
RX_OUT-
Applications
RX_IN-
DAC
APD_CTRL
ADC
RSSI
LOS/ SD
● OC-48, Gigabit Ethernet
Ordering Information
appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to
www.maximintegrated.com/MAX24002.related.
TSENSE
TSENSE_RET
SCL_SLAVE
SDA_SLAVE
SCL_MASTER
SDA_MASTER
MPD
TX_DISABLE
TX_FAULT
BIAS
TX_IN+
TX_IN-
TX_OUT+
TX_OUT-
2.5Gbps CONTINUOUS MODE LASER DRIVER
19-6592; Rev 1; 2/14
MAX24002
1.25Gbps to 2.5Gbps SFP Laser Transceiver
Absolute Maximum Ratings
Voltage Range on V
DD_TX
, V
DD_TXO
,
V
DD_RX
, V
DD_RXO
.........................................-0.3V to +3.65V
Voltage Range on Any Pin Not Otherwise
Specified (with respect to V
SS_
)..........-0.5V to (V
DD_
+ 0.5V)
Continuous Power Dissipation (T
A
= +70°C)
TQFN (derate 35.7 mW/°C above +70°C)
.............2857.1mW
Operating Temperature Range ...........................
-40°C to +95°C
Junction Temperature ......................................................+150°C
Storage Temperature ........................................
-70°C to +150°C
Lead Temperature (soldering, 10s)
.................................
+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Thermal Characteristics
(Note 1)
TQFN
Junction-to-Ambient Thermal Resistance (θ
JA
) .......59.3°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ............22.5°C/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
Recommended DC Operating Conditions
(Device not guaranteed to meet parametric specifications when operated beyond these conditions. Permanent damage may be
incurred by operating beyond these limits.)
PARAMETER
Operating Supply Voltage
RSSI Pin Compliance
BIAS Pin Compliance
TX_OUT Pin Compliance
MPD Input Current
MPD Input Capacitance
Junction Temperature
Case Temperature
For correct APC loop operation
For correct APC loop operation
SYMBOL
V
DD
ROSA sourcing to RSSI pin
ROSA sinking from RSSI Pin
0.75
0.8
0.8
40
4
-40
-40
2000
20
120
95
CONDITIONS
MIN
3.0
TYP
3.3
MAX
3.6
V
DD
-
0.75
UNITS
V
V
V
V
V
µA
pF
°C
°C
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Maxim Integrated │
2
MAX24002
1.25Gbps to 2.5Gbps SFP Laser Transceiver
Electrical Characteristics
(V
CC
= 2.97V to 3.63V, T
A
= -40°C to +95°C.) (Note 2)
Note 2:
Electrical specifications are production tested at TA
= +25°C. Specifications over the entire operating temperature range are
guaranteed by design and characterization. Typical specifications are at TA
= +25°C, 3.3V.
Continuous Ratings
PARAMETER
Supply Current
SYMBOL
I
DD
CONDITIONS
Excluding laser bias and modulation
currents, 20mA bias and modulation current,
Rx CML output 400mV
P-P
MIN
TYP
136
MAX
UNITS
mA
Receiver Characteristics
PARAMETER
Differential Input Impedance
Maximum Input Data Rate
Minimum Input Data Rate
Input Sensitivity
Deterministic Jitter
Random Jitter
Output Rise/Fall Times
Low-Frequency Cutoff
Output Impedance
Minimum Output Swing
Maximum Output Swing
1MHz differential
Differential, 4-bit programmable (Note 3)
Differential, 4-bit programmable (Note 3)
800
80
Differential, BER = 1E-10, 2.5Gbps,
PRBS 2
23
-1 pattern
2.5Gbps, V
OUT
= 800mV
P-P
, V
IN
between
25mV
P-P
differential and 1000mV
P-P
2.5Gbps, V
OUT
= 800mV
P-P
, V
IN
between
25mV
P-P
differential and 1000mV
P-P
2.5Gbps, V
OUT
= 800mV
P-P
, V
IN
= 25mV
p-p differential and 1000mV
P-P
SYMBOL
CONDITIONS
MIN
80
TYP
100
2.5
1.25
6.5
40
2.7
60
30
100
200
880
120
240
13
MAX
120
UNITS
Ω
Gbps
Gbps
mV
P-P
ps
P-P
ps
RMS
ps
kHz
Ω
mV
P-P
mV
P-P
Note 3:
Measured with 1111111100000000 pattern.
Loss-of-Signal and RSSI Characteristics
PARAMETER
Maximum OMA LOS Assert time
Maximum OMA LOS De-Assert
time
Maximum LOS Threshold Setting
LOS Assert/Deassert Level
Maximum RSSI Current level
LOS DAC = 50 (Note 4)
LOS DAC = 105 (Note 4)
Sourced or sunk from RSSI pin
SYMBOL
CONDITIONS
MIN
TYP
11
11
400
67
143
1200
MAX
UNITS
µs
µs
mV
P-P
mV
P-P
mV
P-P
µA
Note 4:
LOS assert and deassert levels can be set independently to define hysteresis.
www.maximintegrated.com
Maxim Integrated │
3
MAX24002
1.25Gbps to 2.5Gbps SFP Laser Transceiver
Transmitter Characteristics
PARAMETER
Maximum Input Data Rate
Minimum Input Data Rate
Maximum Modulation Current
Minimum Modulation Current
Maximum Electrical Rise/Fall
Time (20% to 80%)
Total Jitter
Measured using 15Ω effective termination,
I
MOD
= 8mA
P-P
to 80mA
P-P
PRBS15, 2.488Gbps,
I
MOD
= 8mA
P-P
to 80mA
P-P
, differential
electrical measurement
PRBS15, 2.488Gbps,
I
MOD
= 8mA
P-P
to 80mA
P-P
, differential
electrical measurement
PRBS15, 2.488Gbps,
I
MOD
= 8mA
P-P
to 80mA
P-P
, differential
electrical measurement
SYMBOL
PRBS23
PRBS23
80
8
96
65
175
CONDITIONS
MIN
TYP
2.488
1.25
MAX
UNITS
Gbps
Gbps
mA
P-P
mA
P-P
ps
mUI
P-P
Deterministic Jitter
45
mUI
P-P
Random Jitter
Maximum Bias Current
1.11
90
mUI
RMS
mA
Transmitter Input Characteristics
TX_IN (DIFFERENTIAL AC- OR DC-COUPLED)
BEN (DIFFERENTIAL DC-COUPLED)
V
IH
INPUT
VOLTAGE
RANGE
V
DD
+ 0.1
TX_IN (DIFFERENTIAL AC- OR DC-COUPLED)
BEN (DIFFERENTIAL DC-COUPLED)
TX_IN (DIFFERENTIAL AC- OR DC-COUPLED)
BEN (SINGLE-ENDED/DIFFERENTIAL DC-COUPLED)
V
DD
2V
0.8V
-0.3
V
IH(MAX)
V
IH(MIN)
V
IL(MAX)
V
DD
- 0.88
V
DD
- 1.16
V
DD
- 1.48
V
DD
- 1.81
V
IH(MAX)
V
IH(MIN)
V
IL(MAX)
V
IL(MIN)
0.2V
V
P-P(DIFF)
1.6V
V
IL
CML 3V3
V
DD
- 2.0
V
IL(MIN)
LVPECL 3V3
LVCMOS/LVTTL 3V3
Typical I/O ranges for TX_IN are shown
www.maximintegrated.com
Maxim Integrated │
4
MAX24002
1.25Gbps to 2.5Gbps SFP Laser Transceiver
Digital I/O Characteristics
PARAMETER
Time to Initialize
TX_DISABLE Assert
TX_DISABLE Negate
TX_DISABLE to Reset
SLEEP, TX_DISABLE
INPUTS
SYMBOL
CONDITIONS
From power-up or hot plug
TX_DISABLE assert to optical disable
TX_DISABLE negate to optical enable
Time TX_DISABLE must be held high to
reset TX_FAULT
MIN
TYP
71
0.3
0.5
0.155
MAX
UNITS
ms
µs
ms
µs
LOS, TX_SD, TX_FAULT
OUTPUTS
V
IH(MAX)
V
DD
V
IH(MAX)
V
DD
V
DD
- 0.5V
V
IH(MIN)
V
IL(MAX)
V
IL(MIN)
2V
0.8V
V
IH(MIN)
V
IL(MAX)
0.4V
V
IL(MIN)
V
SS
V
SS
LOW-SPEED LVTTL 3V3
LOW-SPEED LVTTL 3V3
Typical I/O ranges for TX_DISABLE and LOS are shown.
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