MAXIM MAX3263 User Manual

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________________General Description

The MAX3263 is a complete, easy-to-program, single
+5V-powered, 155Mbps laser diode driver with com­plementary enable inputs and automatic power control
(APC). The MAX3263 accepts differential PECL inputs
and provides complementary output currents. A tem­perature-stabilized reference voltage is provided to
simplify laser current programming. This allows modu­lation current to be programmed up to 30mA and bias
current to be programmed from up to 60mA with two
external resistors.

An APC circuit is provided to maintain constant laser
power in transmitters that use a monitor photodiode.
Only two external resistors are required to implement
the APC function.

The MAX3263’s fully integrated feature set includes a
TTL-compatible laser failure indicator and a program­mable slow-start circuit to prevent laser damage. The
slow-start is preset to 50ns and can be extended by
adding an external capacitor.

________________________Applications

Laser Diode Transmitters

155Mbps SDH/SONET

155Mbps ATM

____________________________Features

♦ Rise Times Less than 1ns
♦ Differential PECL Inputs
♦ Single +5V Supply
♦ Automatic Power Control
♦ Temperature-Compensated Reference Voltage
♦ Complementary Enable Inputs

_______________Ordering Information

MAX3263

Single +5V, Fully Integrated,
155Mbps Laser Diode Driver

________________________________________________________________

Maxim Integrated Products

1

___________________Pin Configuration

19-0432; Rev 1b; 4/98

PART

MAX3263CAG 0°C to +70°C

TEMP. RANGE PIN-PACKAGE

24 SSOP

MAX3263

+5V

0.01µF 0.01µF

+5V

+5V

+5V

OUT+

IBIASOUT

IPIN

PECL

INPUTS

OUT-

FAILOUT

IBIASFB

OSADJ

IMODSET

IPINSET

IBIASSET

VCCA VCCB

VIN+

VIN-

ENB+

GNDB

GNDA

ENB-

SLWSTRT

VREF1

VREF2

LASER

2.7k

PHOTO-

DIODE

FERRITE BEAD

_____________Typical Operating Circuit

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].

TOP VIEW

VREF2

1

IPINSET

2

FAILOUT

3

GNDB

4

VIN+

VIN-

GNDB

VCCB

ENB-

ENB+

VREF1

OSADJ

MAX3263

5

6

7

8

9

10

11

12

SSOP

24

23

22

21

20

19

18

17

16

15

14

13

SLWSTRT

IPIN

VCCA

GNDA

OUT+

GNDA

OUT-

GNDA

IBIASOUT

IMODSET

IBIASSET

IBIASFB

MAX3263

Single +5V, Fully Integrated,
155Mbps Laser Diode Driver

2 _______________________________________________________________________________________

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.

TA = +25°C

(Note 1)

CONDITIONS

mA12I

REF

Available Reference Current

V3.15 3.3 3.45V

REF

mA60I

BIAS

Range of Programmable Laser
Bias Current

Reference Voltage

VV

IL

TTL Low Input

mA50I

VCC

Supply Current

VVCC- 1.165V

IH

PECL Input High

VVCC- 1.475V

IL

PECL Input Low

V2 0.8V

IH

TTL High Input

UNITSMIN TYP MAXSYMBOLPARAMETER

Minimum differential input swing is 1100mVp-p
(Note 3)

CONDITIONS

mA30I

MOD

Range of Programmable
Modulation Current

UNITSMIN TYP MAXSYMBOLPARAMETER

I

BIAS

= 25mA, I

MOD

= 12mA, 4ns unit interval;

measured from 10% to 90%

ns1tR, t

F

Modulation-Current Rise and
Fall Time

I

MOD

= 12mA, TA= +25°C %±15OS

Aberrations, Rising and Falling
Edge

I

BIAS

= 25mA, I

MOD

= 12mA, 8ns period ps100PWD

Modulation-Current Pulse­Width Distortion

ABSOLUTE MAXIMUM RATINGS

Terminal Voltage (with respect to GND)

Supply Voltages (V

CC

A, VCCB).............................-0.3V to +6V

VIN+, VIN-, FAILOUT ................................................0V to V

CC

OUT+, OUT-, IBIASOUT ......................................+1.5V to V

CC

ENB+, ENB- ......................VCCor +5.5V, whichever is smaller

Differential Input Voltage (

|

VIN+ - VIN-|).........................+3.8V

Input Current

IBIASOUT ............................................................0mA to 75mA

OUT+, OUT- ........................................................0mA to 40mA

IBIASSET ........................................................0mA to 1.875mA

IMODSET...............................................................0mA to 2mA

IPIN, IPINSET, OSADJ...........................................0mA to 2mA

FAILOUT..............................................................0mA to 10mA

IBIASFB................................................................-2mA to 2mA

Output Current

VREF1, VREF2.....................................................0mA to 20mA

SLWSTRT ..............................................................0mA to 5mA

Continuous Power Dissipation (T

A

= +70°C)

SSOP (derate 8mW/°C above +70°C) ..........................640mW

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

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-55°C to +175°C

DC ELECTRICAL CHARACTERISTICS

(VCC= VCCA = VCCB = +4.75V to +5.25V, TA= 0°C to +70°C, unless otherwise noted. Typical values are at VCC= +5V and
TA= +25°C.)

AC ELECTRICAL CHARACTERISTICS

(VCC= VCCA = VCCB = +4.75V to +5.25V, R

LOAD

(at OUT+ and OUT-) = 25Ω connected to V

CC

, TA= 0°C to +70°C, unless other-

wise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 2)

Loaded with 2.7kΩ pull-up resistor to V

CC

Loaded with 2.7kΩ pull-up resistor to V

CC

V0.5V

OL

FAILOUT Output Low

V4.5V

OH

FAILOUT Output High

Note 2: AC characteristics are guaranteed by design and characterization.
Note 3: An 1100mVp-p differential is equivalent to complementary 550mVp-p signals on VIN+ and VIN-.

Note 1: I

VCC

= I

VCCA

+ I

VCCB

, I

BIAS

= 60mA, I

MOD

= 30mA, and I

PIN

= 140µA.

MAX3263

Single +5V, Fully Integrated,
155Mbps Laser Diode Driver

_______________________________________________________________________________________

3

__________________________________________Typical Operating Characteristics

(MAX3263CAG loads at OUT+ and OUT- = 25Ω, V

CC

= VCCA = VCCB = +5V, TA= +25°C, unless otherwise noted.)

R

vs. BIAS CURRENT

BIASSET

02040

I

(mA)

BIAS

MAX3263-01

(kΩ)

R

60

(kΩ)

BIASSET

R

8

7

6

5

4

3

2

1

0

PERCENT CHANGE IN MODULATION

CURRENT vs. TEMPERATURE

10

8

6

4

2

0

-2

-4

% CHANGE (w.r.t. +25°C)

-6

-8

-10

02040

TEMPERATURE (°C)

MAX3263-04

8060

R

vs. MODULATION CURRENT

MODSET

12

10

8

6

MODSET

4

2

0

0 5 10 15 20 25

MODULATION CURRENT (mAp-p)

DIFFERENTIAL INPUT

SWING = 1100 mVp-p

30

MAX3263-02

1,000,000

100,000

(Ω)

10,000

PINSET

R

1000

100

PERCENT CHANGE IN BIAS

CURRENT vs. TEMPERATURE

3

APC DISABLED

2

1

0

% CHANGE (w.r.t. +25°C)

-1

-2

02040

TEMPERATURE (°C)

MAX3263-05

806010 30 7050

50

48

46

44

42

40

SUPPLY CURRENT (mA)

38

36

34

R

vs. MONITOR CURRENT

PINSET

0 500

MONITOR CURRENT (µA)

SUPPLY CURRENT

vs. TEMPERATURE

02040

TEMPERATURE (°C)

1000

8060

MAX3263-03

MAX3263-06

ALLOWABLE R

vs. MODULATION CURRENT

12

10

(kΩ)

OSADJ

ALLOWABLE R

8

6

ALLOWABLE

4

2

0

RANGE

0 5 10 15 20 25

MODULATION CURRENT (mAp-p)

OSADJ

RANGE

30

MAX3263-07

MAXIMUM MODULATION CURRENT

vs. MINIMUM DIFFERENTIAL

INPUT SIGNAL AMPLITUDE

40

R

= 1.2kΩ

MODSET

R

35

(mAp-p)

30

25

20

15

10

5

MAXIMUM MODULATION CURRENT

0

= 2kΩ

OSADJ

0 400 800 1200 1600

MINIMUM DIFFERENTIAL

INPUT SIGNAL AMPLITUDE

(mVp-p)

MAX3263-08

2000

MAX3263

Single +5V, Fully Integrated,
155Mbps Laser Diode Driver

4 _______________________________________________________________________________________

______________________________________________________________Pin Description

NAME FUNCTIONPIN

10 ENB+

Noninverting Enable TTL Input. Output currents are enabled only when ENB+ is high and
ENB- is low.

1 VREF2 Temperature-Compensated Reference Output. VREF2 is internally connected to VREF1.

12 OSADJ

Overshoot-Adjust Input. Connect to internal voltage reference through a resistor to adjust the
overshoot of the modulation output signal (see

Typical Operating Characteristics

).

11 VREF1 Temperature-Compensated Reference Output. VREF1 is internally connected to VREF2.

13 IBIASFB

Bias-Feedback Current Output. Output from automatic power-control circuit. Connect to
I

BIASSET

when using APC.

14 IBIASSET

Laser Bias Current-Programming Input. Connect to internal voltage reference through a resis­tor to set bias current (see

Typical Operating Characteristics

).

I

BIASOUT

= 40 x (I

BIASSET

+ I

BIASFB

).

15 IMODSET

Laser Modulation Current-Programming Input. Connect to internal voltage reference through
a resistor to set modulation current (see

Typical Operating Characteristics

).

I

MOD

= 20 x I

MODSET

.

16 IBIASOUT

Laser Bias Current Output. Connect to laser cathode through an R-L filter network (see the

Bias Network Compensation

section).

17, 19, 21 GNDA Ground for Bias and Modulation Current Drivers

22 VCCA

+5V Supply Voltage for Bias and Modulation Current Drivers. Connect VCCA to the same
potential as VCCB, but provide separate bypassing for VCCA and VCCB.

20 OUT+ Modulation Output. When VIN+ is low and VIN- is high, OUT+ sinks I

MOD

.

9 ENB- Inverting Enable TTL Input. Output currents are enabled only when ENB+ is high and ENB- is low.

8 VCCB

+5V Supply Voltage for Voltage Reference and Automatic Power-Control Circuitry. Connect
VCCB to the same potential as VCCA, but provide separate bypassing for VCCA and VCCB.

6 VIN- Inverting PECL Data Input

5 VIN+ Noninverting PECL Data Input

4, 7 GNDB Ground for Voltage Reference and Automatic Power-Control Circuitry

3 FAILOUT

Failout Output. Active-low, open-collector TTL output indicates if automatic power-control
loop is out of regulation due to insufficient monitor-diode current (when VPIN is below the

2.6V threshold). Connect FAILOUT to VCC through a 2.7kΩ pull-up resistor.

2 IPINSET

Monitor Photodiode Programming Input. Connect INPINSET to VREF1 or VREF2 through a
resistor to set the monitor current when using automatic power control (see

Typical Operating

Characteristics

).

18 OUT- Modulation Output. When VIN+ is high and VIN- is low, OUT- sinks I

MOD

.

23 IPIN Monitor Photodiode Current Input. Connect IPIN to photodiode’s anode.

24 SLWSTRT

Slow-Start Capacitor Input. Connect capacitor to ground or leave unconnected to set start-up
time, t

STARTUP

= 25.4kΩ (C

SLWSTRT

+ 2pF).