M02067-09-T - Mindspeed Technologies, Inc.

02067-DSH-001-C October 2007

CX02067

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

Data Sheet

Features

Description

Applications

Pin Descriptions

Measurement Tables

Functional Description

Features

Description

Applications

Pin Descriptions

Measurement Tables

Functional Description

Mindspeed™ Technologies, Inc, Proprietary and Confidential

02067-DSH-001-C Page 2 of 15

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

TABLE OF CONTENTS

Table 1 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 3 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 4 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 5 AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 6 DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Modulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Electrical Eye Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Mean Power Control Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 7 MPC Loop Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Enable Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Current Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Slow-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Laser eye safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

BCC+24L Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

02067-DSH-001-C Mindspeed Technologies®3 of 15

Ordering Information

Part Number Package

M02067-09-T BCC+24

M02067G-09-T BCC+24 (RoHS Compliant)

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. Refer to www.mindspeed.com for additional

information.

Revision History

Revision Level Date Description

C Preliminary October 2007 Added RoHS package information, updated format, no specification changes.

B Preliminary April 2002

02067-DSH-001-C Page 4 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

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 = 3.3 V

Automatic Laser Power Control, with programmable

Temperature Compensation and ‘Slow-Start’.

Bias and modulation current monitors

Operates with +3.3 Volt supply

Small BCC+24 package

APPLICATIONS

Gigabit Ethernet

Fibre Channel

2 x Fibre Channel

GBIC

DESCRIPTION

The CX02067 is a highly integrated, programmable laser

driver intended for Datacom applications up to 2.1 Gbps.

Using differential PECL data inputs, the CX02067

supplies the bias and modulation current for driving an

edge-emitting laser. The modulation output can be DC-

coupled to the laser diode, giving a significant power

saving over AC-coupled operation.

The CX02067 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.

CONNECTIONS

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

Fig. 1

02067-DSH-001-C Page 5 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

TABLE 2 PIN DESCRIPTION

Note :

Pin 25, the center pad should be connected to ground.

BCC+24

Pin No 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

3BIASMON

Bias monitor. Connect a resistor between this pin and VCC to monitor bias current. Connect to VCC if

not used

4MODMON

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

9VCC 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 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

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

22 DIN Negative data input (PECL). Self biased

23 VCC Power supply

24 GND Ground

02067-DSH-001-C Page 6 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

TABLE 3 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 4 RECOMMENDED OPERATING CONDITIONS

TABLE 5 AC CHARACTERISTICS

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

Parameter Rating Units

Power supply (VCC-GND) -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

Parameter Rating Units

Power supply (VCC-GND) 3.3 ± 10% V

Operating ambient temperature -40 to +85 °C

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 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 25 Ω, with matching

network - - 150 ps

Overshoot of modulation output current Into 25 Ω 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 25 Ω load

using 27-1 PRBS at 2.1 Gbps - - 50 ps

02067-DSH-001-C Page 7 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

TABLE 6 DC CHARACTERISTICS

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

Note:

(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.

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)

4 V

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

02067-DSH-001-C Page 8 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

FUNCTIONAL DIAGRAM

FUNCTIONAL DESCRIPTION

Overview

The CX02067 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 3.3 V supply. Fig. 2 demonstrates the

functionallity of the CX02067.

Modulator

The modulator output stage is designed to drive up to

85 mA in either AC-coupled or DC-coupled mode.

DC-coupled performance depends on the laser used.

The CX02067 modulation output is optimized for driving a

25 Ω load; the minimum required voltage at OUT+ and

OUT- is 0.6 V. 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 = 51 Ω, 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.

Fig. 3 shows the typical IMOD vs RMODSET characteristic.

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

Fig. 2

100

120

0 4000 8000 12000 16000 20000 24000 28000 32000

MODSET (Ω)

IMOD (mA)

Fig. 3

02067-DSH-001-C Page 9 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

ELECTRICAL EYE DIAGRAM

Fibre Channel 1.0625 Gbps

30 mApp Modulation Current

Gigabit Ethernet 1.25 Gbps

30 mApp Modulation Current

Fig. 4

2 x Fibre Channel 2.125 Gbps

30 mApp Modulation Current

02067-DSH-001-C Page 10 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

FUNCTIONAL DESCRIPTION

Mean Power Control Loop

The CX02067 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 7 MPC LOOP BANDWIDTH

(at 6 dB cut off frequency) vs CMPC (for nominal process)

Fig. 5 shows the bias current vs RMPCSET over the full

operating temperature range

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 CX02067. The

bias current limit is set by an external resistor to ground,

ROCA. When this limit is exceeded the OCA pin is

asserted LOW. Fig. 6 shows the maximum bias current

limit vs ROCA.

The MPC loop FAILure alarm (FAIL) is generated by the

CX02067 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.

Enable Control

The CX02067 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.

Current Monitors

The CX02067 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 - 1.6 V and a

voltage at MODMON greater than VCC - 1.0 V. These pins

should be tied to VCC if not used.

CMPC 6 dB cutoff frequency

0 17 MHz

1 nF 100 kHz

10 nF 10 kHz

100 nF 1 kHz

100

120

0 5000 10000 15000 20000 25000 30000 35000

RMPCSET Ω

Bias current

(mA)

-40 025 50 85

Symbols shown indicate °C

Fig. 5

100

0 10000 20000 30000 40000

ROCA (Ω)

IOCA (mA)

Fig. 6

02067-DSH-001-C Page 11 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

FUNCTIONAL DESCRIPTION

Slow-Start

For laser safety and reliability, the CX02067 incorporates

a slow-start circuit that provides a delay of approximately

200 ns before enabling the laser diode.

Temperature Compensation

The CX02067 features built in temperature compensation

of the modulation current is set using two external

resistors, TCSLOPE and TCSTART see Fig. 7.

Current pulled from TCSLOPE adjusts the slope of the

temperature compensation whereas current pulled from

TCSTART sets the threshold temperature for the

coefficient.

Fig. 8 to 10 shows IMOD temperature compensation using

a combination of resistor values for RTCSLOPE and

RTCSTART.

TCSLOPE

TCSTART

80mA

0mA

+80°C-40°C

1∆

∆

RMPCSET

Fig. 7

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 20 40 60 80 100

Temperature (°C)

IMOD (A)

5000 10000 20000 32000

RTCSLOPE - Figures shown are in Ω

RTCSTART = 0 Ω, VCC = 3.3V

Fig. 8

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 = 250 Ω, VCC = 3.3V

Fig. 9

0.04

0.05

0.06

0.07

0.08

0.09

0.1

-40-20 0 20406080100

Temperature (°C)

Imod (A)

5000 10000 20000 32000

RTCSLOPE - Figures shown are in Ω

RTCSTART = 400 Ω, VCC = 3.3V

Fig. 10

02067-DSH-001-C Page 12 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

LASER EYE SAFETY

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.

IMPORTANT NOTE:

The CX02067 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 CX02067 is used meets all eye-safety

requirements.

02067-DSH-001-C Page 13 of 14

CX02067

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

Mindspeed™ Technologies, Proprietary and Confidential

BCC+24L PACKAGE OUTLINE

TOP VIEW

BOTTOM VIEW

0.15

XM ZY0.08

0.05 Z

0.20 Z

0.45 ± 0.03

0.45 ± 0 .03

XM ZY0.08

DETAIL " A"

0.40 ± 0 .03

0.30 ± 0 .03

XM ZY0.08

DETAIL " B" (20X)

DET AIL " C" (3X )

0.45 ± 0 .03

0. 45 ± 0.03

XM ZY0.08

MZ0.08 XY

4.00± 0.10

0.67± 0.025 0.075± 0.025

0.80 M AX

"B"

0.50± 0.100.50 TYP.

3.15

3.20 "C"

3.20

0.50± 0.100.50 TYP.

3.15

2.20

C.L(PKG.)

C0.2

"A"(PI N 1 CORNER)

(P I N 1 C OR NE R)

Fig. 12

Note : All dimensions are in mm.

CX02067

02067-DSH-001-C Page 14 of 14

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

Preliminary Information

Mindspeed™ Technologies, Proprietary and Confidential

DISCLAIMER

Company Headquarters

Mindspeed Technologies

4000 MacArthur Boulevard, East Tower

Newport Beach, CA 92660

Phone: (949) 579-3000

Fax: (949) 579-3020

Information in this document is provided in connection with Mindspeed Technologies. "Mindspeed" products. These

materials are provided by Mindspeed as a service to its customers and may be used for informational purposes only.

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

specifications and product descriptions at any time, without notice. Mindspeed makes no commitment to update the

information contained herein. Mindspeed 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.

Except as provided in Mindspeed Terms and Conditions of Sale for such products, Mindspeed assumes no liability

whatsoever.

THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,

RELATING TO SALE AND/OR USE OF CONEXANT PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING

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