MAXIM MAX3273 User Manual

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General Description

The MAX3273 is a compact, low-power laser driver for applications up to 2.7Gbps. The device uses a single +3.3V supply and typically consumes 30mA. The bias and modulation current levels are programmed by external resistors. An automatic power-control (APC) loop is incorporated to maintain a constant average optical power over temperature and lifetime. The laser driver is fabricated using Maxim’s in-house, secondgeneration SiGe process.

The MAX3273 accepts differential CML-compatible clock and data input signals. Inputs are self-biased to allow AC-coupling. An input data-retiming latch can be enabled to reject input jitter if a clock signal is available.

The driver can provide bias current up to 100mA and modulation current up to 60mA

P-P

with typical (20% to 80%) edge speeds of 59ps. A failure-monitor output is provided to indicate when the APC loop is unable to maintain average optical power. The MAX3273 is available in a 4mm ✕ 4mm, 24-pin QFN package, as well as in die form.

Applications

SONET OC-48 and SDH STM-16 Transmission Systems

Add/Drop Multiplexers

Digital Cross-Connects

2.5Gbps Optical Transmitters

Features

♦ 30mA Power-Supply Current

♦ Single +3.3V Power Supply

♦ Up to 2.7Gbps (NRZ) Operation

♦ Automatic Average Power Control with Failure

Monitor

♦ Programmable Modulation Current from 5mA to

60mA

♦ Programmable Bias Current from 1mA to 100mA

♦ Typical Fall Time of 59ps

♦ Selectable Data Retiming Latch

♦ Complies with ANSI, ITU, and Bellcore

SDH/SONET Specifications

MAX3273

†

+3.3V, 2.5Gbps Low-Power Laser Driver

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2081; Rev 1; 12/02

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.

*EP=Exposed pad.

**Dice are designed to operate from T

= -40°C to +85°C,

but are tested and guaranteed at T

= +25°C only.

†

Covered by U.S. patent number 5,883,910.

Typical Application Circuit

Pin Configuration appears at end of data sheet.

GND

2.5Gbps

SERIALIZER WITH CLOCK GENERATION

DATA +

DATA -

CLK+

CLK-

50Ω

DATA +

100Ω

DATA -

CLK+

100Ω

CLK-

PART TEMP RANGE PIN-PACKAGE

MAX3273EGG

MAX3273E/D -40°C to +85°C Dice**

LATCH

MAX3273

MODSET

FAIL

BIASMAX

0.01µF

APCFILT1

APCSET

APCFILT2

OUT-

OUT+

BIAS

-40°C to +85°C 24 QFN-EP* (4mm × 4mm)

25Ω

20Ω

0.056µF

500pF

REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE.

MAX3273

+3.3V, 2.5Gbps Low-Power Laser Driver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.14V to +3.6V, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, I

BIAS

= 60mA, I

MOD

= 30mA, TA= +25°C, unless

otherwise noted.) (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 +6.0V

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

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

Voltage at DATA+, DATA-, CLK+,

CLK-, LATCH, EN, FAIL..........................-0.5V to (V

+ 0.5V)

Voltage at MODSET, BIASMAX,

APCSET, APCFILT1, APCFILT2.........................-0.5V to +3.0V

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

+ 1.5V)

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

+ 1.5V)

Current into FAIL ...............................................-10mA to +10mA

Continuous Power Dissipation (T

= +85°C)

24-Pin QFN (derate 274mW/°C above +85°C) ..........1781mW

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

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

Die Attach Temperature (die) ..........................................+400°C

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

Supply Current I

Bias-Current Range I Bias Off-Current EN = high (Note 2), V

Bias-Current Stability APC open loop (Note 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BIAS

Excluding I

Voltage on BIAS pin (V

BIAS

and I

MOD

) = VCC - 1.6V 1 100 mA

BIAS

≤ 2.6V 0.2 mA

BIAS

Bias-Current Absolute Accuracy APC open loop (Note 4) -15 +15 %

Differential Input Voltage V

Common-Mode Input Voltage V

TTL Input High Voltage V

TTL Input Low Voltage V

TTL Output High V

TTL Output Low V

ICM

Figure 1 0.2 1.6 V

Sourcing 50µA 2.4 V

Sinking 100µA 0.4 V

MD Voltage 1.6 V

Monitor Diode DC-Current Range I

Monitor-Diode Bias Set Point Stability

(Note 3) 18 1000 µA

IMD = 1000µA -480 83 +480

= 18µA -480 159 +480

Monitor-Diode Bias Absolute Accuracy

= 100mA 61

= 1mA 198

30 45 mA

VCC -

1.49

VCC -

1.32

VCC V

2.0 V

0.8 V

-15 +15 %

ppm/°C

P-P

ppm/°C

MAX3273

+3.3V, 2.5Gbps Low-Power Laser Driver

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(VCC= +3.14V to +3.6V, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, I

BIAS

= 60mA, I

MOD

= 30mA, TA= +25°C, unless

otherwise noted.) (Notes 5, 6)

Note 1: Specifications at -40°C are guaranteed by design and characterization. Dice are tested at T

= +25°C only.

Note 2: Both the bias and modulation currents are switched off if any of the current set pins is grounded. Note 3: Guaranteed by design and characterization. Note 4: Accuracy refers to part-to-part variation. Note 5: AC characterization was performed by using the circuit in Figure 2. Note 6: AC characteristics are guaranteed by design and characterization, and measured using a 2.5Gbps 2

- 1 PRBS input data

pattern with 80 consecutive zeros and 80 consecutive ones added.

Note 7: Measured using a 2.5Gbps repeating 0000 1111 pattern. Note 8: PWD = (wide pulse - narrow pulse) / 2.

Modulation-Current Range I Modulation Off-Current EN = high 0.2 mA

Modulation-Current Stability

Modulation-Current Absolute Accuracy

Output Current Rise Time t

Output Current Fall Time t

Output Overshoot/Undershoot δ (Note 7) 15 %

Enable and Startup Delay APC open loop 364 ns

Maximum Consecutive Identical Digits

Pulse-Width Distortion PWD (Notes 7, 8) 3 45 ps

Random Jitter 1.0 1.5 ps

Input Latch Setup Time T

Input Latch Hold Time T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MOD

(Note 3) 5 60 mA

= 60mA -480 64 +480

MOD

= 5mA -480 34 +480

MOD

(Note 4) -15 +15 %

20% to 80% (Note 7) 52 87 ps

20% to 80% (Note 7) 59 104 ps

LATCH = high (Figure 1) 75 150 ps

LATCH = high (Figure 1) 0 50 ps

ppm/°C

80 bits

RMS

MAX3273

+3.3V, 2.5Gbps Low-Power Laser Driver

4 _______________________________________________________________________________________

Figure 1. Required Input Signal and Setup/Hold-Time Definition

Figure 2. Output Termination for Characterization

CLK+

CLK-

VIS = 0.1V TO 0.8V

DATA -

DATA +

(DATA+) - (DATA-)

MOD

= MURATA BLM11HA601SPT

= MURATA BLM21HA102SPT

= COILCRAFT D01607C-333

= 0.1V TO 0.8V

= 0.2V TO 1.6V

5mA TO 60mA

OUT-

OUT+

BIAS

15Ω

0.056µF

50Ω

25Ω

OSCILLOSCOPE

50Ω

MAX3273

+3.3V, 2.5Gbps Low-Power Laser Driver

_______________________________________________________________________________________ 5

Typical Operating Characteristics

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

ELECTRICAL EYE DIAGRAM

MOD

= 20mA, 213 - 1 80CID)

MAX3273 toc01

125mV/div

60ps/div

ELECTRICAL EYE DIAGRAM

MOD

= 60mA, 213 - 1 80CID)

MAX3273 toc02

400mV/div

60ps/div

BIASMAX

vs. R

BIASMAX

MAX3273 toc04

BIASMAX

(kΩ)

BIASMAX

(mA)

140

120

100

0.1 10 1001 1000

57ps/div

MITSUBISHI ML725C8F

LASER DIODE

OPTICAL EYE DIAGRAM

(2.488Gbps, 1300nm FP LASER,

1.87GHz FILTER)

MAX3273 toc03

0.1 100101

MOD

vs. R

MODSET

MAX3273 toc05

MODSET

(kΩ)

MOD

(mA)

0.1 10 100

IMD vs. R

APCSET

MAX3273 toc06

APCSET

(kΩ)

(mA)

1.4

0.2

0.4

0.6

0.8

1.2

1.0

100

-40 10-15 35 60 85

SUPPLY CURRENT vs. TEMPERATURE

MAX3273 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

EXCLUDE I

BIAS

, I

MOD

25Ω LOAD

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