M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Features
Applications
• Rise and fall times <150 ps
• Gigabit Ethernet
• DC or AC-coupled modulation drive
• Fibre Channel
• Independently programmable laser bias and modulation currents
• 2 x Fibre Channel
• Bias current to 100 mA and modulation current to 85 mA at
VCC = 3.3V
• GBIC
• Automatic laser power control,
compensation and ‘slow-start’
with
programmable
Rev V4
temperature
• Bias and modulation current monitors
• Operates with +3.3V supply
The M02067 is a highly integrated, programmable laser driver intended for datacom applications up to 2.1 Gbps.
Using differential PECL data inputs, the M02067 supplies the bias and modulation current for driving an edgeemitting laser. The modulation output can be DC-coupled to the laser diode, giving a significant power saving over
AC-coupled operation.
The M02067 includes automatic power control to maintain a constant average laser output power over temperature
and life. In addition, the modulation current is temperature compensated to minimize variation in extinction ratio
over temperature.
Output flags indicate laser end of life as well as failure of the APC circuitry to maintain average output power.
Functional Block Diagram
VCC
OUTOUT+
RD
RSHUNT
CSHUNT
VCC
DATA
GNDA
X100
DIS
ENA
BIASMON
X1
55
MODMON
IBIAS
X60
IBIAS
PD
IMOD
Failure
Detect
55
FAIL
RMPCSET
OCA SET
OCA
ROCA
RTCSTART
RMODSET
1
RTCSLOPE
VREF
CMPC
VCC
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
Ordering Information
Part Number
Package
M02067G-12
QFN package (-12 marking)
M02067G-13
QFN package (-12• marking)
M02067-TEVM
TO-Can optical evaluation board
M02067-E-EVM
Electrical evaluation board
* The letter “G” designator after the part number indicates that the device is RoHS-compliant.
Revision History
Revision
Level
Date
Description
V4
Release
May 2015
Updated logos and page layout. No content changes.
G (V3)
Release
July 2011
Added M02067G-13 ordering information and screen limit.
F (V2)
Release
January 2011
E (V1)
Release
November 2010
D
Preliminary
October 2007
C
Preliminary
June 2006
Added RoHS package information, updated format, no specification changes.
B
Preliminary
May 2005
Updated to new data sheet format.
A
Advance
October 2003
Revised RMODSET value in Table 1-3, Note 4.
Revised production test conditions in Table 1-5.
Updated ordering information, packaging information. Added DC screen information.
Replaced all CX02067 references with M02067.
Updated ordering information.
Advance.
M02067-12 and M02067-13 Marking Diagrams
M02067 G-12
M02067 G-13
- 12
02067 G
XXXXX
YYWW CC
- 12
02067 G
XXXXX
YYWW CC
Part Number
Lot Number
Date and Country Code
2
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
ENA
24
23
21
VCC
DIN
DIN
22
20
19
OCA SET
DIS
2
18
BIASMON
3
17
TCSTART
MODMON
4
16
TCSLOPE
FAIL
5
15
GND
OCA
6
14
CMPC
10
11
12
13
MODSET
PD
GNDA
9
OUT-
8
OUT+
7
VCC
GND
2067
BIAS
4mm
1
VCC
GND
Top View Pin Configuration
(See Figure 4-1 for detailed drawing)
4mm
3
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
1.0 Product Specification
1.1
Absolute Maximum Ratings
These are the absolute maximum ratings at or beyond which the IC can be expected to fail or be damaged.
Reliable operation at these extremes for any length of time is not implied.
Table 1-1.
Absolute Maximum Ratings
Parameter
Rating
Units
-0.5 to +6.0
V
Maximum laser bias current
120
mA
Maximum laser modulation current (through OUT+, OUT-)
100
mA
Storage temperature
-65 to +150
°C
Junction temperature (die)
-40 to +120
°C
Power supply (VCC-GND)
1.2
Recommended Operating Conditions
Table 1-2.
Recommended Operating Conditions
Parameter
Rating
Units
Power supply (VCC-GND)
3.3 ± 10%
V
Operating ambient temperature
-40 to +85
°C
4
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
1.3
Rev V4
DC Characteristics
Table 1-3.
DC Characteristics
Parameter
Conditions
Min
Typ
Max
Units
Supply current
Excluding IBIAS and IMOD but with
IBIAS and IMOD set to maximum
-
52
64
mA
Bias current adjust range
Limited by IREF across temperature
range
4
-
100
mA
Bias current with output disabled
Tx-Dis = HIGH
-
-
300
µA
Maximum bias current limit
TA = +85 °C (adjustable)
100(1)
-
-
mA
Monitor diode reverse bias voltage
2
-
-
V
Monitor diode current adjustment range
40
-
1000
µA
TTL/CMOS input HIGH voltage (enable/
disable)
2.0
-
-
V
TTL/CMOS input LOW voltage (enable/
disable)
-
-
0.8
V
CMOS output HIGH voltage (Fail,OCA)
2.4
-
-
V
CMOS output LOW voltage (Fail,OCA)
-
-
0.4
V
2.5
-
-
kΩ
VCC -1.38
-
VCC - VIN(Diff)
4
V
VCC -1.38
-
VCC -0.47
V
1
ms
1
µs
300
µA
Differential input impedance
Data and clock inputs
Common-mode input voltage‘
Self-biased common mode input voltage
Data and clock inputs
Ratio of bias monitoring current, and
bias current
55
Ratio of modulation monitoring current,
and modulation current
55
Tx_Disable negate time (2)
CMPC = 3.8 nF
Tx_Disable assert time (3)
Modulation Off Current (4)
Measured at pin OUT-,
temperature at 75 °C
.5
VCC = +3.3V ±10%, TA = -40 °C to +85 °C, unless otherwise noted
Notes:
(1)Condition when pin 19 OCASET is connected to ground.
(2)Time for optical power to reach 90% of its mean level following negation of Tx_Disable.
(3)Time for optical power to reach 10% of its mean level following assertion of Tx_Disable.
(4)Data input voltage (Vpin21 – Vpin22) > 300 mV, ENA (pin 1) connected to VCC, DIS (pin 2) connected to ground. RMODSET = 5.5 kΩ,
resistance to ground at GNDA = 0.35 Ω.
5
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
1.4
Rev V4
AC Characteristics
Table 1-4.
AC Characteristics
Parameter
Conditions
Differential input voltage
= 2 x (DIN+HIGH-DIN+LOW)
Modulation current range
Min.
Typ.
Max.
Units.
300
-
1860
mV
2.5
-
85
mA
Modulation current with output disabled
DIS = HIGH
-
-
300
µA
Programmable range for modulation
current temperature coefficient
Adjustable
500
-
104
ppm/°C
Programmable temperature at which
modulation current TC compensation
enables
Programmed by choice of RTCSLOPE
20
-
60
°C
Modulation output rise/fall times
20% to 80% into 25Ω, with matching network
-
-
150
ps
Overshoot of modulation output current
Into 25Ω load, with matching network
-5
-
+5
%
Modulation output Pulse width
distortion
Measured using alternating 1-0 pattern
-
-
50
ps
Peak-to-peak. Measured into 25Ω load using 27PRBS at 2.1 Gbps
-
-
50
ps
Modulation output deterministic jitter
1
Notes:
VCC = +3.3V ±10%, TA = -40 °C to +85 °C, unless otherwise noted
1.5
DC Screen
The M02067 is screened under the following conditions.
TA = 25 °C, VCC = 3.3 V, RMODSET = 8.46 kΩ
Table 1-5.
DC Screen
Part Number
M02067G-12
Parameter
Modulation Current
Production Test Conditions
Measured at pin OUT-
Screen Limits
41.8 mA min. to 50.8 mA max
Load resistor at OUT- is 24 Ω connected to VCC
M02067G-13
Modulation Current
Measured at pin OUT-
41.8 mA min. to 48.0 mA max
Load resistor at OUT- is 24 Ω connected to VCC
6
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
2.0 Pin Description
2.1
Pin Descriptions
Table 2-1.
Pin Descriptions
Pin Number
Pin Name
Function
1
ENA
Bias and modulation output enable (TTL/CMOS). Logic HIGH for normal operation.
2
DIS
Bias and modulation output disable (TTL/CMOS). Logic LOW for normal operation.
3
BIASMON
Bias monitor. Connect a resistor between this pin and VCC to monitor bias current. Connect to VCC if not used.
4
MODMON
Modulation monitor. Connect a resistor between this pin and VCC to monitor modulation current. Connect to
VCC if not used.
5
FAIL
Mean power control failure indicator (TTL/CMOS). Goes LOW when control loop is no longer able to maintain
constant current at PD.
6
OCA
Over-current alarm (TTL/CMOS). Goes LOW when IBIAS exceeds the preset bias current limit.
7
GND
Ground.
8
BIAS
Laser bias current output.
9
VCC
Power supply.
10
OUT+
Positive modulation current output. Sinks current when DIN is HIGH.
11
OUT-
Negative modulation current output. Sinks current when DIN is HIGH.
12
GNDA
Ground to output stage.
13
PD
14
CMPC
Mean power control dominant pole capacitor. Connect to VCC via a capacitor.
15
GND
Ground.
16
TCSLOPE
Connecting a resistor between this pin and ground sets the temperature coefficient of IMODSET.
17
TCSTART
Secondary temperature coefficient of IMOD. A resistor on this pin to ground sets the threshold temperature at
which compensation starts.
18
MODSET
Modulation current set. Connect a resistor between this pin and ground to set.
19
OCASET
Over-current alarm set. Connect a resistor between this pin and ground to set.
20
VCC
Power supply.
21
DIN
Positive data input (PECL). Self biased.
Monitor photodiode input. This input is connected to the monitor photodiode anode for automatic power
control.
7
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Table 2-1.
Rev V4
Pin Descriptions (Continued)
Pin Number
Pin Name
Function
22
DIN
Negative data input (PECL). Self biased.
23
VCC
Power supply.
24
GND
Ground.
Note:
Center pad (pad 25) should be connected to ground.
8
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
3.0 Functional Description
3.1
Overview
The M02067 laser driver consists of a high-speed modulation driver and a laser bias generator with mean power
control (MPC). It is optimized for high speed, low power operation at 3.3V supply. Figure 3-1 demonstrates the
functionallity of the M02067.
Figure 3-1.
M02067 Block Diagram
VCC
OUTOUT+
RD
RSHUNT
CSHUNT
VCC
DATA
GNDA
X100
DIS
ENA
BIASMON
X1
55
MODMON
IBIAS
X60
IBIAS
PD
IMOD
Failure
Detect
55
FAIL
RMPCSET
OCA SET
OCA
ROCA
RTCSTART
RTCSLOPE
RMODSET
VREF
CMPC
VCC
9
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
3.2
Rev V4
Features
•
Rise and fall times <150 ps
•
DC or AC-coupled modulation drive
•
Independently programmable laser bias and modulation currents
•
Bias current to 100 mA and modulation current to 85 mA at VCC = 3.3V
•
Automatic laser power control, with programmable temperature compensation and ‘Slow-Start’
•
Bias and modulation current monitors
•
Operates with +3.3V supply
3.3
Modulator
The modulator output stage is designed to drive up to 85 mA in either AC-coupled or DC-coupled mode. DCcoupled performance depends on the laser used.
The M02067 modulation output is optimized for driving a 25Ω load; the minimum required voltage at OUT+ and
OUT- is 0.6V. To interface with the laser diode, a matching resistor (RD) is required for impedance matching. An
RC shunt network is necessary to compensate for the laser diode parasitic inductance, thereby improving the
optical eye. Typical values are RSHUNT = 51Ω, CSHUNT = 3.3 pF
Any capacitive loading at the cathode of a laser diode will degrade the optical output performance. An inductor is
used to isolate the BIAS pin from the laser cathode.
Figure 3-2 shows the typical IMOD vs RMODSET characteristic.
Figure 3-2.
Modulation Current for Given RMODSET Resistor
120
100
I
(mA)
MOD
80
60
40
20
0
0
4000
8000
12000
16000
20000
24000
28000
32000
RMODSET (Ω)
10
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Figure 3-3.
Rev V4
Fibre Channel 1.0625 Gbps Electrical Eye Diagram
Fibre Channel
1.0625 Gbps
30 mApp Modulation Current
Figure 3-4.
Gigabit Ethernet 1.25 Gbps Electrical Eye Diagram
Gigabit Ethernet
1.25 Gbps
30 mApp Modulation Current
11
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Figure 3-5.
Rev V4
2 x Fibre Channel 2.125 Gbps Electrical Eye Diagram
2 x Fibre Channel
2.125 Gbps
30 mApp Modulation Current
3.4
Mean Power Control Loop
The M02067 employs a Mean Power Control (MPC) loop to maintain a constant optical output power from the laser
across temperature, time and power supply variations. Laser diodes used for communication purposes come with
integrated photo-diodes to monitor the output power and provide the feedback for the MPC loop. The MPC loop (or
its integrated safety features) cannot be used without this feedback.
The MPC loop adjusts the laser bias current so that the monitor current from the photo-diode is matched to a
reference current set by a single external resistor, RMPCSET. The time constant of the MPC loop is determined by
CMPC.
Table 3-1.
MPC Loop Bandwidth
CMPC
6 dB cutoff frequency
0
17 MHz
1 nF
100 kHz
10 nF
10 kHz
100 nF
1 kHz
(at 6 dB cut off frequency) vs CMPC (for nominal process)
Figure 3-6 shows the bias current vs RMPCSET over the full operating temperature range for a typical laser and
monitor photodiode.
12
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Figure 3-6.
Rev V4
Bias Current vs. RMPCSET
120
Bias current
(mA)
100
80
60
40
20
0
0
5000
10000
15000
20000
25000
30000
50
85
35000
RMPCSET Ω
-40
0
25
Symbols shown indicate °C
There are two safety features integrated into the MPC loop; an Over-Current Alarm and an MPC loop failure alarm.
The Over-Current Alarm (OCA) circuit limits the maximum bias current generated by the M02067. The bias current
limit is set by an external resistor to ground, ROCA. When this limit is exceeded the OCA pin is asserted LOW.
Figure 3-7 shows the maximum bias current limit vs ROCA.
Figure 3-7.
Maximum Bias Current vs. ROCA
100
90
80
I OCA (mA)
70
60
50
40
30
20
10
0
0
10000
20000
30000
40000
ROCA (Ω )
13
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
The MPC loop FAILure alarm (FAIL) is generated by the M02067 when the MPC loop can no longer maintain the
constant current set by RMPCSET. When the MPC loop failure alarm is triggered the FAIL pin is asserted LOW.
3.5
Enable Control
The M02067 incorporates a dual polarity laser enable function with both enable (ENA) and disable (DIS) inputs.
Under normal operating conditions the ENA will be HIGH while DIS is LOW. Should ENA go LOW (or DIS go
HIGH) both the bias and modulation currents will be disabled.
Wire OR-ing the OCA and FAIL pins externally and connecting them to the ENA pin will automatically disable the
bias and modulation currents when a failure occurs.
3.6
Current Monitors
The M02067 features bias and modulation current monitor outputs. The BIASMON output sinks a current equal to
nominally 1/55 of the laser bias current (IBIAS). The MODMON output sinks a current equal to nominally 1/55 of the
laser modulation current (IMOD). BIASMON and MODMON should be connected through a pull-up resistor to VCC.
Choose a pull-up resistor value that ensures a voltage at BIASMON greater than VCC - 1.6V and a voltage at
MODMON greater than VCC - 1.0V. These pins should be tied to VCC if not used.
3.7
Slow-Start
For laser safety and reliability, the M02067 incorporates a slow-start circuit that provides a delay of approximately
200 ns before enabling the laser diode.
14
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
3.8
Rev V4
Temperature Compensation
The M02067 features built in temperature compensation of the modulation current is set using two external
resistors, TCSLOPE and TCSTART see Figure 3-8.
Current pulled from TCSLOPE adjusts the slope of the temperature compensation whereas current pulled from
TCSTART sets the threshold temperature for the coefficient.
Figure 3-8.
Temperature Compensation
80mA
Δ1
TC SLOPE
Δ2
R MPCSET
-40°C
0mA
TC START
+80°C
Figures 3-9 through 3-11 show IMOD temperature compensation using a combination of resistor values for
RTCSLOPE and RTCSTART.
15
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
Figure 3-9.
0.06
0.058
0.056
IMOD (A)
0.054
0.052
0.05
0.048
0.046
0.044
0.042
0.04
-40
-20
0
20
40
60
80
100
Temperature (°C)
5000
10000
20000
32000
RTC SLOPE - Figures shown are in Ω
RTC START = 0Ω , VCC = 3.3V
Figure 3-10.
0.085
0.08
0.075
IMOD (A)
0.07
0.065
0.06
0.055
0.05
0.045
0.04
-40
-20
0
20
40
60
80
100
Temperature (°C)
5000
10000
20000
32000
RTCSLOPE - Figures shown are in Ω
RTCSTART = 250Ω , VCC = 3.3V
16
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
Figure 3-11.
0.1
0.09
0.07
I
mod
(A)
0.08
0.06
0.05
0.04
-40
-20
0
20
40
60
80
100
Temperature (°C)
5000
10000
20000
32000
RTC SLOPE - Figures shown are in Ω
RTC START = 400Ω , VCC = 3.3V
3.9
Laser eye safety
All lasers for commercial and industrial use, including lasers for optical communications are classified for eye
safety considerations in IEC 60825-1, CDRH and other national standards.
NOTE:
The M02067 alone does NOT ensure that any application within which it is used will be fully compliant with the relevant
eye-safety requirements.
It remains the sole responsibility of the user of this component to ensure that the application within which the M02067
is used meets all eye-safety requirements.
17
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
4.0 Packaging Specification
4.1
Packaging Specification
Table 4-1.
Packaging Specifications
Parameter
Value
Assembly location
ASE Malaysia
X dimension (mm)
4.00 ± 0.10
Y dimension (mm)
4.00 ± 0.10
Z dimension (mm)
0.90 ± 0.10
Pad standoff (mm)
0.02 + 0.03, -0.02
Terminal finish
100% Matte SN
Marking
Laser
18
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Figure 4-1.
Rev V4
M02067 QFN24 Package Outline Drawing
19
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M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
M/A-COM Technology Solutions Inc. All rights reserved.
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products. These materials are provided by MACOM as a service to its customers and may be used for
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