M02067G-13 - Mindspeed Technologies, Inc.

02067-DSH-001-G Mindspeed Technologies®July 2011

Mindspeed Proprietary and Confidential

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 edge-

emitting laser. The modulation output can be DC-coupl ed to the laser diode, givin g a significant power saving over

AC-coupled operation.

The M02067 includes auto matic po wer co ntrol to maint ain a constant a v er age laser outp ut po wer o v er temper ature

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.

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 p ower control, with programmable temperature

compensation and ‘slow-start’

• Bias and modulation current monitors

• Operates with +3.3V supply

Applications

• Gigabit Ethernet

• Fibre Channel

• 2 x Fibre Channel

•GBIC

Functional Block Diagram

X100

X60

Failure

Detect

DIS

ENA

FAIL

OCA

DATA

BIASMON

MODMON

IBIAS

IMOD

OUT-

OUT+

VCC

IBIAS

RMODSET

RTCSLOPE

RTCSTART

RMPCSET

VCC

CMPC

VREF

ROCA

OCASET

GNDA

RSHUNT

CSHUNT

VCC

M02067

3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps

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Ordering Information

Part Number Package

M02067G-12 QFN package (-12 marking)

M02067G-13 QFN package (-12• ma rk ing)

M02067-TEVM TO-Can optical evaluation board

M02067-E-EVM Electrical evaluation board

Current part number ordering information for this part on mindspeed.com

* The letter “G” designator after the part number indicates that the device is RoHS-compliant. Ref er to www.mindspeed.com for additional

information.

Revision History

Revision Level Date Description

G Release July 2011 Added M02067G-13 ordering information and screen limit.

F Release January 2011 Revised RMODSET value in Table 1-3, Note 4.

Revised production test conditions in Table 1-5.

E Release November 2010 Updated ordering information, packaging information. Added DC screen information.

Replaced all CX02067 references with M02067.

D Preliminary October 2007 Updated ordering information.

C Preliminary June 2006 Added RoHS package information , updated for mat, no specification changes.

B Preliminary May 2005 Updated to new data sheet format.

A Advance October 2003 Advance.

M02067-12 and M02067-13 Marking Diagrams

XXXXX

YYWW CC

02067 G Part Number

Lot Number

Date and Country Code

XXXXX

YYWW CC

02067 G

-12 -12

M02067 G-12 M02067G-13

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Top View Pin Configuration

(See Figure 4-1 for detailed drawing)

78 9 10 11 12 13

24 23 22 21 20

ENA

DIS

FAIL

OCA

GND

BIAS

OUT+

OUT-

GND

VCC

GNDA

CMPC

TCSLOPE

TCSTART

MODSET

OCASET

DIN

VCC

4mm

BIASMON

4mm MODMON

VCC

2067

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1.0 Product Specification

1.1 Absolute Maximum Ratings

These are the absolute maximum ratings at or be yond which the IC can be expected to fail or be damaged.

Reliable operation at these extremes for any length of time is not implied.

1.2 Recommended Operating Conditions

Table 1-1. Absolute Maximum Rati ng s

Parameter Rating Units

Power supply (VCC-GND) -0.5 to +6.0 V

Maximum laser bia s 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

Table 1- 2. Recommended Operating Conditions

Parameter Rating Units

Power supply (VCC-GND) 3.3 ± 10% V

Operating ambient temperature -40 to +85 °C

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1.3 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

Differential input impedance Data and clock inputs 2.5 - - kΩ

Common-mode input voltage‘ VCC -1.38 - VCC - VIN(Diff)

Self-biased common mode input voltage Data and clock inputs VCC -1.38 - VCC -0.47 V

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 .5 1 ms

Tx_Disable assert time (3) 1µs

Modulation Off Current (4) Measured at pin OUT-,

temperature at 75 °C 300 µA

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.

Product Specification

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1.4 AC Characteristics

1.5 DC Screen

The M02067 is screened under the following conditions.

TA = 25 °C, VCC = 3.3 V, RMODSET = 8.46 kΩ

Table 1-4. AC Characteristics

Parameter Conditions Min. Typ. Max. Units.

Differential input voltage = 2 x (DIN+HIGH-DIN+LOW) 300 - 1860 mV

Modulation current range 2.5 - 85 mA

Modulation current with output disabled DIS = HIGH - - 300 µA

Programmable range for modulation

current temperature coefficient Adjustable 500 - 104ppm/°C

Programmable temperat ure at whic h

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

Modulation output deterministic jitter Peak-to-peak. Measured into 25Ω load using 27-

1 PRBS at 2.1 Gbps - - 50 ps

Notes:

VCC = +3.3V ±10%, TA = -40 °C to +85 °C, unless otherwise noted

Table 1-5. DC Screen

Part Number Parameter Production Test Conditions Screen Limits

M02067G-12 Modulation Current Measured at pin OUT-

Load resistor at OUT- is 24 Ω connected to VCC 41.8 mA min. to 50.8 mA max

M02067G-13 Modulation Current Measured at pin OUT-

Load resistor at OUT- is 24 Ω connected to VCC 41.8 mA min. to 48.0 mA max

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2.0 Pin Description

2.1 Pin Descriptions

Table 2-1. Pin Descriptions

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.

3BIAS

MON Bias monitor. Connect a resi stor between this pin and VCC to monitor bias current. Connect to VCC if not used.

4MOD

MON Modulation monitor. Connect a resistor between this pin and VCC to monitor modulation current. Connect to

VCC if not used.

5FAIL

Mean power control failure indicator (TTL/CMOS). Goes LOW when control loop is no longer able to maintain

constant current at PD.

6OCA

Over-current alarm (TTL/CMOS). Goes LOW when IBIAS exceeds the preset bias current limit.

7 GND Ground.

8 BIAS Laser bias current output.

CC Power supply.

10 OUT+ Positive modulation cur rent output. Sinks current when DIN is HIGH.

11 OUT- Negative modulation current output. Sinks current when DIN is HIGH.

12 GNDAGround to output stage.

13 PD Monitor photodiode input. This input is connected to the monitor photodiode anode for automatic power

control.

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 temperatur e 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.

22 DIN Negative data input (PECL). Self biased.

Pin Description

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23 VCC Power supply.

24 GND Ground.

Note:

Center pad (pad 25) should be connected to ground.

Table 2-1. Pin Descriptions (Continued)

Number Pin Name Function

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3.0 Functional Description

3.1 Overview

The M02067 laser driver consists of a high-speed modulatio n driver and a laser bias generator with mean power

control (MPC). It is opt im ized for high speed, low powe r op eratio n at 3.3V supply. Figure 3-1 demonstrates the

functionallity of the M02067.

Figure 3-1. M02067 Block Diagram

X100

X60

Failure

Detect

DIS

ENA

FAIL

OCA

DATA

BIASMON

MODMON

IBIAS

IMOD

OUT-

OUT+

VCC

IBIAS

RMODSET

RTCSLOPE

RTCSTART

RMPCSET

VCC

CMPC

VREF

ROCA

OCASET

GNDA

RSHUNT

CSHUNT

VCC

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3.2 Features

• Rise and fall times <150 ps

• DC or AC-coupled modulation drive

• Independently programmable laser bias and modulation curren ts

• 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 eit her AC-coupled or DC-coupled mode. DC-

coupled performance depe nds 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 interf ace with the laser di ode, a ma tching resistor (RD) is required f o r impedance matchi ng. An RC

shunt network is necessary to compensate f or the laser diode parasitic inductance, thereby improving th e 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 sho ws the typical IMOD vs RMODSET characteristic.

Figure 3-2. Modulation Current for Given RMODSET Resistor

100

120

0 4000 8000 12000 16000 20000 24000 28000 32000

RMODSET (Ω)

IMOD (mA)

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Figure 3-3. Fibre Channel 1.0625 Gbps Electrical Eye Diagram

Figure 3-4. Gigabit Ethernet 1.25 Gbps Electrical Eye Diagram

Fibre Channel 1.0625 Gbps

30 mApp Modulation Current

Gigabit Ethernet 1.25 Gbps

30 mApp Modulation Current

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3.4 Mean Power Control Loop

The M02067 emplo ys a Mean P o wer Contro l (MPC) loop to maintain a constan t optical output po wer from t he laser

across temperature, time and power supply variations. Laser diodes used for communication purposes come with

integr ated pho to-diod es to monito r the output p o wer and pro vide the feedbac k f o r the MPC lo op . 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.

(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.

Figure 3-5. 2 x Fibre Channel 2.125 Gbps Electrical Eye Diagram

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

2 x Fibre Channel 2.125 Gbps

30 mApp Modulation Current

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There are tw o saf ety f e atures integ rate d into the MPC loop; an Ov er -Current Alarm and an MPC loop f ailure alarm.

The Ov er-Curr ent Alarm (OCA) circuit limits the maximum bias curren t gener ated b y t he M02067. Th e 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.

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 trigger ed the FAIL pin is asserted LOW.

Figure 3-6. Bias Current vs. RMPCSET

Figure 3-7. Maximum Bias Current vs. ROCA

100

120

0 5000 10000 15000 20000 25000 30000 35000

RMPCSET Ω

Bias current

(mA)

-40 025 50 85

Symbols shown indicate °C

100

0 10000 20000 30000 40000

ROCA (Ω)

IOCA

(mA)

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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 LO W. 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 monito r outputs. The BIASMON output sinks a current equa l to

nominally 1/55 of the laser bias current (IBIAS). The MODMON output sinks a current equal to nominally 1/55 of the

laser modulatio n current (IMOD). BIASMON and MODMON should be connected through a pull-up resistor to VCC.

Choose a pull-up resistor v alue that ensures a voltage at BIASMON greater than VCC - 1.6V and a volt ag e 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 slo w -start circuit that provides a delay of approximately

200 ns before enabling the laser diode.

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3.8 Temperature Compensation

The M02067 features built in temperature compensation o f the modulation current is set using two external

resistors, TCSLOPE and TCSTART see Figure 3-8.

Current pulled from TCSLOPE adjusts the slope o f the temperature compensation whereas current pulled from

TCSTART sets the threshold temperature for the coefficient.

Figures 3-9 through 3-11 show IMOD temperature compensation using a combination of resistor values for

RTCSLOPE and RTCSTART.

Figure 3-8. Temperature Compensation

TCSLOPE

TCSTART

80mA

0mA

+80°C-40°C

RMPCSET

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Figure 3-9.

Figure 3-10.

0.04

0.042

0.044

0.046

0.048

0.05

0.052

0.054

0.056

0.058

0.06

-40-20 0 20406080100

Temperature (°C)

IMOD (A)

5000 10000 20000 32000

RTCSLOPE - Figures shown are in Ω

RTCSTART = 0Ω, VCC = 3.3V

0.04

0.045

0.05

0.055

0.06

0.065

0.07

0.075

0.08

0.085

-40-20 0 20406080100

Temperature (°C)

IMOD (A)

5000 10000 20000 32000

RTCSLOPE - Figures shown are in Ω

RTCSTART = 250Ω, VCC = 3.3V

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3.9 Laser eye safety

All lasers f or commercial and industrial use , including lasers f or optical comm unications are classified f or e ye saf ety

considerations in IEC 60825-1, CDRH and other national standards.

Figure 3-11.

NOTE: The M02067 alone does NOT ensure th at any application within which it is used will be fully compliant with

the relevant eye-safety requirements.

It remains the sole responsibility of th e user of this component to ensure that the application wi thin which the

M02067 is used meets all eye-safety requirements.

0.04

0.05

0.06

0.07

0.08

0.09

0.1

-40 -20 0 20 40 60 80 100

Temperature (°C)

Imod (A)

5000 10000 20000 32000

RTCSLOPE - Figures shown are in Ω

RTCSTART = 400Ω, VCC = 3.3V

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4.0 Packaging Specification

4.1 Packaging Specification

Table 4-1. Packaging Specifications

Parameter Value

Assembly locati on 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

Packaging Specification

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Figure 4-1. M02067 QF N24 Package Outline Dra wing

www.mindspeed.com

General Information:

Telephone: (949) 579-3000

Headquarters - Newport Beach

4000 MacArthur Blvd., East Tower

Newport Beach, CA 92660

Information in this do cument is provided in connection with Mindspeed Technologies® ("Mindspeed®") products.

These materials are pro vided by Mindspee d as a service to its customers and may be used for informational

purposes only. Except as provid ed in Mindspeed’s Terms and Conditions of Sale for such products or in any

separate agreement related to this document, Mindspe ed assumes no liability whatsoeve r. Mindspeed assumes

no responsibility for errors or omissions in these materials. Mindspeed may make changes to specifications and

product descriptions at an y time, without notice. Mindspeed makes no commitment to update the information and

shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its

specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any

intellectual property rights is granted by this document.

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