MAXIM MAX3286, MAX3289, MAX3296, MAX3299 User Manual

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General Description

The MAX3286/MAX3296 series of products are high­speed laser drivers for fiber optic LAN transmitters opti­mized for Gigabit Ethernet applications. Each device
contains a bias generator, laser modulator, and com­prehensive safety features. Automatic power control
(APC) adjusts the laser bias current to maintain aver­age optical power at a constant level, regardless of
changes in temperature or laser properties. For lasers
without a monitor photodiode, these products offer a
constant-current mode. The circuit can be configured
for use with conventional shortwave (780nm to 850nm)
or longwave (1300nm) laser diodes, as well as vertical­cavity surface-emitting lasers (VCSELs).

The MAX3286 series (MAX3286–MAX3289) is opti­mized for operation at 1.25Gbps, and the MAX3296
series (MAX3296–MAX3299) is optimized for 2.5Gbps
operation. Each device can switch 30mA of laser mod­ulation current at the specified data rate. Adjustable
temperature compensation is provided to keep the opti­cal extinction ratio within specifications over the operat­ing temperature range. This series of devices is
optimized to drive lasers packaged in low-cost TO-46
headers. Deterministic jitter (DJ) for the MAX3286 is
typically 22ps, allowing a 72% margin to Gigabit
Ethernet DJ specifications.

These laser drivers provide extensive safety features to
guarantee single-point fault tolerance. Safety features
include dual enable inputs, dual shutdown circuits, and
a laser-power monitor. The safety circuit detects faults
that could cause dangerous light output levels. A pro­grammable power-on reset pulse initializes the laser
driver at startup.

The MAX3286/MAX3296 are available in a compact, 5mm

✕

5mm, 28-pin QFN or thin QFN package; a 5mm ✕5mm,
32-pin TQFP package; or in die form. The MAX3287/
MAX3288/MAX3289 and MAX3297/MAX3298/MAX3299
are available in a 16-pin TSSOP-EP package.

Applications

Gigabit Ethernet Optical Transmitter

Fibre Channel Optical Transmitter

ATM LAN Optical Transmitter

Features

♦ 7ps Deterministic Jitter (MAX3296)

22ps Deterministic Jitter (MAX3286)

♦ +3.0V to +5.5V Supply Voltage
♦ Selectable Laser Pinning (Common Cathode or

Common Anode) (MAX3286/MAX3296)

♦ 30mA Laser Modulation Current
♦ Temperature Compensation of Modulation Current
♦ Automatic Laser Power Control or Constant

Bias Current

♦ Integrated Safety Circuits
♦ Power-On Reset Signal
♦ QFN and Thin QFN Packages Available

MAX3286–MAX3289/MAX3296–MAX3299

3.0V

to

5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers

________________________________________________________________ Maxim Integrated Products 1

19-1550; Rev 6; 11/04

Ordering Information continued at end of data sheet.

Ordering Information

Typical Application Circuits and Selector Guide appear at
end of data sheet.

*Exposed pad is connected to GND.
Pin Configurations continued at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX3286CTI+ 0°C to +70°C

28 Thin QFN
(5mm x 5mm)****

MAX3286CGI 0°C to +70°C

28 QFN
(5mm x 5mm)***

MAX3286CHJ 0°C to +70°C

32 TQFP
(5mm x 5mm)

28

272625

242322

TC

MODSET

V

CC

OUT-

OUT+

VCCV

CC

8

9

10

11

121314

FLTDLY

LV

V

CC

IN+

IN-

GND

REF

15

16

17

18

19

20

21

POL

POL

MD

MON

GND

SHDNDRV

BIASDRV

7

6

5

4

3

2

1

PORDLY

EN

EN

GND

POR

FAULT

FAULT

MAX3286
MAX3296

THIN QFN*

TOP VIEW

+

Pin Configurations

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

*Dice are designed to operate from TJ= 0°C to +110°C, but
are tested and guaranteed only at TA= +25°C.

**Exposed pad.
***Package Code: G2855-1
****Package Code: T2855-7
+Denotes Lead-Free Package.

MAX3286–MAX3289/MAX3296–MAX3299

3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, TA= 0°C to +70°C, unless otherwise noted. Typical values are at VCC= +3.3V, RTC= open and TA= +25°C;
see Figure 1a.)

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.

Supply Voltage at VCC..........................................-0.5V to +7.0V

Voltage at

EN, EN, PORDLY, FLTDLY, LV, IN+, IN-,

REF, POL, POL, MD, MON, BIASDRV,

MODSET, TC.......................................................-0.5V to (V

CC

+ 0.5V)

Voltage at OUT+, OUT-.........................(V

CC

- 2V) to (VCC+ 2V)

Current into FAULT, FAULT, POR, SHDNDRV....-1mA to +25mA

Current into OUT+, OUT- ....................................................60mA

Continuous Power Dissipation (T

A

= +70°C)

32-Pin TQFP (derate 14.3mW/°C above +70°C).........1100mW

28-Pin QFN and 28-Pin Thin QFN

(derate 28.7mW/°C above +70°C)..............................2300mW

16-Pin TSSOP (derate 27mW/°C above +70°C) .........2162mW

Operating Temperature Range...............................0°C to +70°C

Operating Junction Temperature Range ..............0°C to +150°C

Processing Temperature (die) .........................................+400°C

Storage Temperature Range .............................-55°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

0 ≤ V

PIN

≤ V

CC

Total differential signal, peak-to-peak, Figure 1a

LV = open

Figure 1a, R

MOD

= 1.82kΩ

LV = GND

V

MON

= V

CC

I

REF

≤ 2mA, MON = V

CC

FAULT = low, V

BIASDRV

≥ 0.6V

Normal operation (FAULT = low)

EN = GND

IOH= -100µA

Common-cathode configuration

IOL= 1mA

APC loop is closed

CONDITIONS

V

MD

+ 5% V

MD

+ 20%MD High Fault Threshold

V2.95REF Fault Threshold

mV150POR Hysteresis

2.65 3.00

V

3.9 4.5

POR Threshold

µA0.44 6MON Input Current

µA-2 +0.16 +2MD Input Current

V

0.4 1.2

V1.55 1.7 1.85V

MD

MD Nominal Voltage

µA-100 +100TTL Input Current

mV200 1660V

ID

mA52 75I

CC

Supply Current

Data Input Voltage Swing

V2.45 2.65 2.85REF Voltage

mA0.8BIASDRV Current Sink

µA-1 +1BIASDRV Current, Shutdown

V2V

IH

TTL Input High Voltage

V0.8V

IL

TTL Input Low Voltage

V2.4V

OH

FAULT, FAULT Output High
Voltage

V0.4V

OL

FAULT, FAULT Output Low
Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

Common-anode configuration 2VCC- 0.8

MD Voltage During Fault

V

MD

- 20% V

MD

- 5%MD Low Fault Threshold

MAX3286/MAX3288/MAX3296/MAX3298

mV

VCC- V

CC -

600 480

MON Fault Threshold

V

0.9MODSET, TC Fault Threshold

FAULT = low, V

BIASDRV

≤ VCC- 1V 0.8BIASDRV Current Source

BIAS GENERATOR (Note 1)

POWER-ON RESET

FAULT DETECTION

mA

MAX3286–MAX3289/MAX3296–MAX3299

3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +5.5V, TA= 0°C to +70°C, unless otherwise noted. Typical values are at VCC= +3.3V, RTC= open and TA= +25°C;
see Figure 1a.)

I

SHDNDRV

= 15mA, FAULT not asserted

I

SHDNDRV

= 10µA, FAULT asserted

MAX3296 series

MAX3286 series

I

SHDNDRV

= 1mA, FAULT not asserted

MAX3286 series

MAX3296 series

Tempco = max, R

MOD

= open; Figure 5

CONDITIONS

620 800 980Differential Input Resistance

4000

Modulation-Current
Temperature Coefficient

0V

CC

- 1.2

VCC- 0.4

Voltage at SHDNDRV

15 200Shutdown Modulation Current

24

28

RMSRandom Jitter (Note 3)

0V

CC

- 2.4

1.25

Data Rate

UNITS

MIN TYP MAXSYMBOL

PARAMETER

2

Minimum Laser Modulation
Current

MAX3286 series

20% to 80%

Modulation-Current Edge
Speed

MAX3296 series

R

MOD

= 13kΩ

(I

MOD

= 5mA)

MAX3286 series

46 65

Deterministic Jitter (Note 2)

R

MOD

= 4.1kΩ

(I

MOD

= 15mA)

R

MOD

= 1.9kΩ

(I

MOD

= 30mA)

22 35

R

MOD

= 13kΩ

(I

MOD

= 5mA)

MAX3296 series

14 35

R

MOD

= 4.1kΩ

(I

MOD

= 15mA)

822

R

MOD

= 1.9kΩ

(I

MOD

= 30mA)

720

C

PORDLY

= 0.01µF,

MAX3286/MAX3296 only

3 5.5

(Note 4)

Glitch Rejection at MD 10 20

22t

FAULT

Fault Time

SHUTDOWN

LASER MODULATOR

50Tempco = min, RTC= open; Figure 5

R

MOD

= 13kΩ (I

MOD

= 5mA) -15 +15

Single ended 42 50 58Output Resistance

LASER SAFETY CIRCUIT

PORDLY = open 0.3 1.25

t

PORDLY

POR Delay

V

CC

- 0.3

Input Bias Voltage

RL≤ 25Ω 30

Maximum Laser Modulation
Current

R

MOD

= 1.9kΩ (I

MOD

= 30mA) -10 +10

Tolerance of Modulation Current

V

mA

mA

%

ps

ps

µA

ppm/°C

Ω

Ω

V

µs

ms

µs

µs

29 45

ps

90 150

130 220

2.5

Gbps

MAX3286–MAX3289/MAX3296–MAX3299

3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

POR DELAY vs. C

PORDLY

MAX3286 toc01

CAPACITANCE (pF)

DELAY (µs)

10,000

100,000

1

10

100

1000

100 1000 10,00010 100,000

FLTDLY DURATION vs. C

FLTDLY

MAX3286 toc02

CAPACITANCE (pF)

DELAY (µs)

10,000

1

10

100

1000

100 1000 10,000101

Note 1: Common-anode configuration refers to a configuration where POL = GND, POL = VCC, and an NPN device is used to set

the laser bias current. Common-cathode configuration refers to a configuration where POL = V

CC

, POL = GND, and a PNP

device is used to set the laser bias current.

Note 2: Deterministic jitter measured with a repeating K28.5 bit pattern 00111110101100000101. Deterministic jitter is the peak-to-

peak deviation from the ideal time crossings per ANSI X3.230, Annex A.

Note 3: For Fibre Channel and Gigabit Ethernet applications, the peak-to-peak random jitter is 14.1 times the RMS jitter.
Note 4: Delay from a fault on MD until FAULT is asserted high.

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +5.5V, TA= 0°C to +70°C, unless otherwise noted. Typical values are at VCC= +3.3V, RTC= open and TA= +25°C;
see Figure 1a.)

MAX3286/MAX3296 only, Figure 1b,
C

FLTDLY

= open

C

FLTDLY

= 270pF

C

FLTDLY

= 0

MAX3286/MAX3296 only, Figure 1b

MAX3286/MAX3296 only, Figure 1b

CONDITIONS

ns610

t

EN_RESET

EN or EN Minimum Pulse Width
Required to Reset a Latched
Fault

100 140

µs

0.2 1

t

FLTDLY

FLTDLY Duration

µs3.5 5.5t

SHUTDN

SHDNDRV Asserted after EN =
Low or EN = High

µs12t

RESET

FAULT Reset after EN, EN, or
POR Transition

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX3286/MAX3296 only, Figure 1b,
C

FLTDLY

= 0.01µF

6 µs

EYE DIAGRAM

50ps/div

2.5Gbps, 1310nm LASER, 27 - 1 PRBS, I

MOD

MAX3286 toc03

= 15mA

MAX3286–MAX3289/MAX3296–MAX3299

3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers

_______________________________________________________________________________________ 5

Pin Description

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

EN STARTUP

(COMMON-ANODE CONFIGURATION)

MAX3286 toc04

EN

OPTICAL

OUTPUT

BIASDRV

FAULT

5µs/div

MD SHUTDOWN

MAX3286 toc05

MD

OPTICAL
OUTPUT

SHDNDRV

FAULT

10µs/div

EYE DIAGRAM

MAX3286 toc06

100ps/div

1.25Gbps, 1310nm LASER, 2

7

- 1 PRBS, I

mod

= 15mA

PIN

QFN/

THIN QFN

MAX3286
MAX3296

TQFP
MAX3286
MAX3296

TSSOP-EP

MAX3287
MAX3297
MAX3289
MAX3299

TSSOP-EP

MAX3288
MAX3298

NAME FUNCTION

11——FAULT Inverting Fault Indicator. See Table 1.

—2, 16, 19 — — N.C. No Connect

23——FAULT Noninverting Fault Indicator. See Table 1.

34——POR

Power-On Reset. POR is a TTL-compatible
output. See Figure 14.

4, 13, 19

1, 6 1, 6 GND Ground

56——EN

Enable TTL Input. The laser output is enabled
only when EN is high and EN is low. If EN is
left unconnected, the laser is disabled.

67——EN

Inverting Enable TTL Input. The laser output
is enabled only when EN is low or grounded
and EN is high. If EN is left unconnected, the
laser is disabled.

78——PORDLY

Power-On Reset Delay. To extend the delay
for the power-on reset circuit, connect a
capacitor to PORDLY. See the Design
Procedure section.

5, 14, 22, 30

MAX3286–MAX3289/MAX3296–MAX3299

3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers

6 _______________________________________________________________________________________

Pin Description (continued)

PIN

QFN/

THIN QFN

MAX3286
MAX3296

TQFP
MAX3286
MAX3296

TSSOP-EP

MAX3287
MAX3297
MAX3289
MAX3299

TSSOP-EP

MAX3288
MAX3298

NAME FUNCTION

8922FLTDLY

Fault Delay Input. Determines the delay of
the FAULT and FAULT outputs. A capacitor
attached to FLTDLY ensures proper startup
(see the Typical Operating Characteristics) .
FLTDLY = GND: holds FAULT low and
FAULT high. When FLTDLY = GND, EN =
high, EN = low, and V

CC

is within the
operational range, the safety circuitry is
inactive.

910——LV

Low-Voltage Operation. Connect to GND for

4.5V to 5.5V operation. Leave open for 3.0V
to 5.5V operation (Table 2).

10, 22, 23,

26

11, 25, 26,

29

3, 11, 14 3, 11, 14 V

CC

Supply Voltage

11 12 4 4 IN+ Noninverting Data Input

12 13 5 5 IN- Inverting Data Input

14 15 7 7 REF

Reference Voltage. A resistor connected at
REF to MD determines the laser power when
APC is used with common-cathode lasers.

15 17 — — POL

Polarity Input. POL is used for programming
the laser-pinning polarity (Table 4).

16 18 — — POL

Inverting Polarity Input. POL is used for
programming the laser-pinning polarity
(Table 4).

17 20 8 8 MD

Monitor Diode Connection. MD is used for
automatic power control.

18 21 — 9 MON

Laser Bias Current Monitor. Used for
programming laser bias current in VCSEL
applications.

20 23 9 — SHDNDRV

Shutdown Driver Output. Provides a
redundant laser shutdown.

21 24 10 10 BIASDRV

Bias-Controlling Transistor Driver. Connects
to the base of an external PNP or NPN
transistor.

MAX3286–MAX3289/MAX3296–MAX3299

3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers

_______________________________________________________________________________________ 7

MD

FAULT CONDITION

V

CC

VMD> 1.15 ✕V

MD(nom)

,

V

MD

< 0.85 ✕V

MD(nom)

LV = GND and VCC< 4.5V

REF

EN and EN

V

REF

> 2.95V

PIN

POL and POL

EN = low or open, EN = high or open

POL = POL

MON V

MON

< VCC- 540mV

Table 1. Typical Fault Conditions

>4.5Grounded

>3.0Open

OPERATING VOLTAGE

RANGE (V)

LV

Table 2. LV Operating Range

MODSET

and TC

V

MODSET

and VTC≤ 0.8V

Pin Description (continued)

PIN

QFN/

THIN QFN

MAX3286
MAX3296

TQFP
MAX3286
MAX3296

TSSOP-EP

MAX3287
MAX3297
MAX3289
MAX3299

TSSOP-EP

MAX3288
MAX3298

NAME FUNCTION

24 27 12 12 OUT+

Modulation-Current Output. See the Typical
Application Circuits.

25 28 13 13 OUT-

Modulation-Current Output. See the Typical
Application Circuits.

27 31 15 15 MODSET

Modulation-Current Set. The resistor at
MODSET programs the temperature-stable
component of the laser modulation current.

28 32 16 16 TC

Temperature-Compensation Set. The resistor
at TC programs the temperature-increasing
component of the laser modulation current.

EP — EP EP

Exposed

Pad

Ground. This must be soldered to the circuit
board ground for proper thermal
performance. See Layout Considerations.

MAX3286–MAX3289/MAX3296–MAX3299

3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers

8 _______________________________________________________________________________________

MODULATION

CONTROL

MODSET

TC

L = 3.9nH

L = 3.9nH

R

L

= 25Ω

BIASDRV

LASER

EQUIVALENT

LOAD

(OPEN)

OUT- OUT+

FERRITE BEAD*

*MURATA
BLM11HA102

0.01µF

0.01µF

IN+

IN-

50Ω 50Ω

25Ω

R

L

R

MOD

V

CC

V

CC

V

CC

I

OUT

I

CC

V

CC

I

MOD

3/2

i

MOD

V

ID

VID = V

IN+ - VIN-

CURRENT

I

MOD

V

IN-

V

IN+

VOLTS

TIME

100mV

P-P

MIN

830mV

P-P

MAX

200mV

P-P

MIN

1660mV

P-P

MAX

DIFFERENTIAL INPUT

RESULTING SIGNAL

MAX3286
MAX3296

Figure 1a. Output Load for AC Specification

V

CC

POR

FAULT

FAULT ON MD RESET BY EN SHUTDOWN

BY EN

SHDNDRV

OPTICAL

OUT

EN

NOTE: TIMING IS NOT TO SCALE.

t

PORDLY

t

FAULT

t

RESET

t

SHUTDN

t

EN_RESET

Figure 1b. Fault Timing

_______________Detailed Description

The MAX3286/MAX3296 series of laser drivers contain a
bias generator with APC, laser modulator, power-on reset
(POR) circuit, and safety circuitry (Figures 2a and 2b).

Bias Generator

Figure 3 shows the bias generator circuitry containing a
power-control amplifier, controlled reference voltage,
smooth-start circuit, and window comparator. The bias
generator combined with an external PNP or NPN transis­tor provides DC laser current to bias the laser in a light­emitting state. When there is a monitor diode (MD) in the
laser package, the APC circuitry adjusts the laser-bias
current to maintain average power over temperature and
changing laser properties. The MD input is connected to

MAX3286–MAX3289/MAX3296–MAX3299

3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers

_______________________________________________________________________________________ 9

SMOOTH-

START

IN+

IN-

TC MODSET

R

MOD

V

CC

R

TC

MON

SHDNDRV

REF

POR

PORDLY

POL

POL

FAULT

FAULT

FLTDLY

EN

EN

1.97V

LV

1.53V

+1.7V

50Ω 50Ω

CONTROLLED

REFERENCE
GENERATOR

LASER

MODULATOR

MODULATION CURRENT

GENERATOR

1.7V
REF

BIASDRV

MD

OUT­OUT+

POR CIRCUIT

SAFETY

CIRCUITRY

INPUT BUFFER

VCC - 0.54V

MAX3286
MAX3296

BIAS GENERATOR

Figure 2b. Laser Driver Functional Diagram

LASER

MODULATOR

POR CIRCUIT

SAFETY

BIAS GENERATOR

MODSET

TC

BIASDRV

MD

SHDNDRV

FAULT

FAULT

POR

LV

PORDLY

EN

EN

FLTDLY

POL

POL

MON

MD

OUT-

OUT+

REF

IN+

IN-

Figure 2a. Simplified Laser Driver Functional Diagram

the anode or cathode of a monitor photodiode or to a
resistor-divider, depending on the specific application
circuit. Three application circuits are supported:
common-cathode laser with photodiode, common­cathode laser without photodiode, and common-anode
laser with photodiode (as shown in the Design Procedure
section). The POL and POL inputs determine the laser
pinning (common cathode, common anode) (Table 4).

The smooth-start circuitry prevents current spikes to the
laser during power-up or enable; this ensures compliance
with safety requirements and extends the life of the laser.

The power-control amplifier drives an external transistor
to control the laser bias current. In a fault condition, the
power-control amplifier’s output is disabled (high