Maxim MAX3669EHJ, MAX3669E-D Datasheet

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General Description

The MAX3669 is a complete, +3.3V laser driver with auto­matic power control (APC) circuitry for SDH/SONET appli­cations up to 622Mbps. It accepts differential PECL
inputs, provides bias and modulation currents, and oper­ates over a temperature range from -40°C to +85°C.

An APC feedback loop is incorporated to maintain a
constant average optical power over temperature and
lifetime. The wide modulation current range from 5mA
to 75mA and bias current of 1mA to 80mA are easy to
program, making this product ideal for use in various
SDH/SONET applications. Two pins are provided to
monitor the current levels in the laser: BIASMON with
current proportional to laser bias current, and MOD­MON with current proportional to laser modulation.

The MAX3669 also provides enable control and a failure­monitor output to indicate when the APC loop is unable to
maintain the average optical power. The MAX3669 is
available in a 5mm 32-pin TQFP package as well as in
dice.

Applications

622Mbps SDH/SONET Access Nodes

Laser Driver Transmitters

Section Regenerators

Features

♦ +3.3V or +5.0V Single-Supply Operation
♦ 40mA Supply Current at +3.3V
♦ Programmable Bias Current from 1mA to 80mA
♦ Programmable Modulation Current from

5mA to 75mA

♦ Bias Current and Modulation Current Monitors
♦ 200ps Rise/Fall Time
♦ Automatic Average Power Control with Failure

Monitor

♦ Complies with ANSI, ITU, and Bellcore

SONET/SDH Specifications

♦ Enable Control

MAX3669

+3.3V, 622Mbps SDH/SONET

Laser Driver with Current Monitors and APC

________________________________________________________________ Maxim Integrated Products 1

Typical Application Circuit

19-1575; Rev 0; 10/99

PART

MAX3669EHJ -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

32 TQFP (5mm x 5mm)

EVALUATION KIT

AVAILABLE

Ordering Information

Pin Configuration appears at end of data sheet.

MAX3669E/D (Note A) Dice*

Note A: Dice are designed to operate over a -40°C to +140°C
junction temperature (T

j

) range, but are tested and guaranteed

at T

A

= +25°C.

*Contact factory for availability.

+3.3V

+3.3V

LASER

V

GND

CC

OUT-

OUT+

BIAS

MD

R-

6.3Ω

R+
20Ω

C

D

1µF

FERRITE

BEAD

R

D

5Ω

R

FILT

20Ω

C

FILT

5pF

C

MD

1000pF

MAX3693

4:1

SERIALIZER

WITH

CLOCK GEN

124Ω

PECL

84.5Ω

+3.3V

124Ω

84.5Ω

DATA+

DATA-

BIASMON

MODMON

ENABLE

BIASMAX

MAX3669

MODSET

APCSET

FAIL

CAPC

0.1µF

MAX3669

+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.14V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.3V, TA= +25°C.) (Note 1)

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, VCC.............................................-0.5V to +7.0V

Current into BIAS ............................................-20mA to +150mA

Current into OUT+, OUT- ............................... -20mA to +100mA

Current into MD....................................................-5mA to +5mA

Voltage at DATA+, DATA-, ENABLE,

FAIL, BIASMON, MODMON..................-0.5V to (V

CC

+ 0.5V)

Voltage at OUT+, OUT-.............................+1.5V to (V

CC

+ 1.5V)

Voltage at MODSET, APCSET, BIASMAX,

CAPC............................................................... -0.5V to +3.0V

Voltage at BIAS .........................................+1.0V to (V

CC

+ 0.5V)

Continuous Power Dissipation (T

A

= +85°C)

32-Pin TQFP (derate 14.3mW/°C above +85°C)........ 929mW

Operating Junction Temperature Range...........-55°C to +150°C

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

Storage Temperature Range ............................ -65°C to +165°C

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

MODMON to I

MOD

Gain A

MOD

29 mA/mAI

MOD/IMODMON

BIASMON to I

BIAS

Gain A

BIAS

38 mA/mAI

BIAS/IBIASMON

35IMD= 18µA (Note 5)

IMD= 1mA

815I

BIAS

= 1mA

I

BIAS

= 80mA

PARAMETER SYMBOL MIN TYP MAX UNITS

Common-Mode Input Voltage V

ICM

V

CC

-V

CC

-V

CC

-

1.49 1.32 V

ID

/4

V

Differential Input Voltage V

ID

200 1600 mVp-p

Bias Current Absolute Accuracy -15 15 %

Bias Current Stability

255

ppm/°C

DATA+, DATA- Input Current I

IN

-1 10 µA

Monitor Diode Current Stability

-480 -50 480
ppm/°C

Monitor Diode Current
Absolute Accuracy

-15 15 %

DC Monitor Diode Current I

MD

18 1000 µA

Bias Current Range

Supply Current 40 60 mA

I

BIAS

180mA

Bias Off Current 100 µA

Monitor Diode Input Voltage
(MD pin)

V

MD

0.8 V

TTL Input High Voltage V

IH

2.0 V

TTL Input Low Voltage V

IL

0.8 V

TTL Output High Voltage (FAIL)

V

OH

2.4 V

CC

- 0.3 V

CC

V

TTL Output Low Voltage (FAIL)

V

OL

0.1 0.44 V

CONDITIONS

PECL compatible

Figure 1

APC open loop

APC open loop

(Note 4)

Sourcing 50µA

Sinking 100µA

(Note 2)

V

BIAS

= V

CC

- 1.6V

ENABLE = low (Note 3)

MAX3669

+3.3V, 622Mbps SDH/SONET

Laser Driver with Current Monitors and APC

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(VCC= +3.14V to +5.5V, load as shown in Figure 2, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.3V,
T

A

= +25°C.) (Note 6)

Note 1: Dice are tested and guaranteed at TA= +25°C only.
Note 2: Tested with R

MODSET

= 5.11kΩ (I

MOD

≈ 38mA), R

BIASMAX

= 4.56kΩ (I

BIAS

≈ 52mA), excluding I

BIAS

and I

MOD

.

Note 3: Both the bias and modulation currents will be disabled if any of the current set pins are shorted to ground.
Note 4: Guaranteed by design and characterization. This assumes that the laser to monitor diode transfer function does not change

with temperature.

Note 5: See Typical Operating Characteristics for worst-case distributions.
Note 6: AC characteristics are guaranteed by design and characterization.
Note 7: Total I

MOD

out of OUT+. See the Design Procedure for information regarding current delivered to the laser.

Note 8: Input signal is a 622Mbps, 2

13

- 1 PRBS with 80 inserted zeros.

Note 9: Input signal is a 622Mbps, 11110000 pattern.
Note 10:PWD = (wider pulse – narrower pulse) / 2.

Figure 1. Required Input Signal and Output Polarity

Figure 2. Output Termination for Characterization

10 135I

MOD

= 75mA

Maximum Consecutive Identical
Digits at 622Mbps

CID 80 Bits

I

MOD

= 5mA

I

MOD

= 75mA

Jitter Generation (peak-to-peak) 100 ps(Note 8)

205I

MOD

= 5mA (Note 5)

I

MOD

= 5mA

(Notes 9, 10)

PARAMETER SYMBOL MIN TYP MAX UNITS

230 375

psOutput Rise/Fall Time t

R, tF

100 200

Modulation Current Absolute
Accuracy

-15 15 %

Pulse-Width Distortion
(peak-to-peak)

70 155

ps

Enable/Start-Up Delay 250 ns

Modulation Current Stability

-620 -165 620
ppm/°C

CONDITIONS

20% to 80%,
R

L

= 10Ω||20Ω load

Open loop

I

MOD

= 75mA

Modulation Current Range I

MOD

575mA(Note 7)

Modulation Off-Current 200 µAENABLE = low (Note 3)

V

CC

DATA+

DATA-

(DATA+) - (DATA-)

+

I

OUT

100mV MIN

800mV MAX

200mVp-p
MIN

1600mVp-p
MAX

I

MOD

20Ω

1µF

OUT-

10Ω

BIAS

I

OUT+

V

20Ω

1µF

12.4Ω

15Ω

CC

MAX3669

OUT+

OSCILLOSCOPE

50Ω

ELECTRICAL EYE DIAGRAM

(I

MOD

= 35mA)

MAX3669 TOC02

200ps/div

PATTERN = 213 - 1 + 80 CID
I

MOD

= 35mA

622Mbps DATA RATE

ELECTRICAL EYE DIAGRAM

(I

MOD

= 75mA)

MAX3669 TOC03

200ps/div

PATTERN = 213 - 1 + 80 CID
I

MOD

= 75mA

622Mbps DATA RATE

EYE DIAGRAM

(622Mbps, 1300nm LASER

WITH 467MHz FILTER)

MAX3669 TOC01

200ps/div

223–1 PRBS

10

0.01
1 10 100

MONITOR DIODE CURRENT

vs. APC SET RESISTOR

0.1

1

MAX3669 TOC04

R

APCSET

(kΩ)

I

MD

(mA)

1000

1

0.1 101 100

BIAS CURRENT vs.

MAXIMUM BIAS SET RESISTOR

10

100

MAX3669 TOC05

R

BIASMAX

(kΩ)

I

BIAS

(mA)

100

1

0.1 100 1000

MODULATION CURRENT

vs. MODULATION SET RESISTOR

10

MAX3669 TOC06

R

MODSET

(kΩ)

I

MOD

(mA)

101

16

17

19

18

20

21

04020 60 80

RANDOM JITTER

vs. MODULATON CURRENT

MAX3669 TOC07

I

MOD

(mA)

RANDOM JITTER (ps

p-p

)

INCLUDES RANDOM JITTER
DUE TO MEASUREMENT
EQUIPMENT

0

15

10

5

20

25

30

35

40

45

50

04020 60 80

PULSE-WIDTH DISTORTION

vs. MODULATION CURRENT

MAX3669 TOC08

I

MOD

(mA)

PWD (ps)

-40 10-15 35 60 85

MAX3669 TOC09

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

0

20

10

40

30

50

60

SUPPLY CURRENT

vs. TEMPERATURE

I

BIAS

= 48mA

I

MOD

= 27mA

VCC = 5.0V

VCC = 3.3V

MAX3669

+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= +3.3V, TA= +25°C, unless otherwise noted.)