MAX3738ETG+T Maxim Integrated Products, MAX3738ETG+T Datasheet

IC LASER DRIVER 4.25GBPS 24TQFN

MAX3738ETG+T

Manufacturer Part Number
MAX3738ETG+T
Description
IC LASER DRIVER 4.25GBPS 24TQFN
Manufacturer
Maxim Integrated Products
Type
Laser Diode Driver (Fiber Optic)r
Datasheet
1.MAX3738ETG.pdf (16 pages)

Specifications of MAX3738ETG+T

Data Rate
4.25Gbps
Number Of Channels
1
Voltage - Supply
2.97 V ~ 3.63 V
Current - Supply
47mA
Current - Modulation
85mA
Current - Bias
100mA
Operating Temperature
-40°C ~ 85°C
Package / Case
24-TQFN Exposed Pad
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX3738 is a +3.3V laser driver designed for mul-
tirate transceiver modules with data rates from
155Mbps to 4.25Gbps. Lasers can be DC-coupled to
the MAX3738 for reduced component count and ease
of multirate operation.
Laser extinction ratio control (ERC) combines the features
of automatic power control (APC), modulation compensa-
tion, and built-in thermal compensation. The APC loop
maintains constant average optical power. Modulation
compensation increases the modulation current in pro-
portion to the bias current. These control loops, com-
bined with thermal compensation, maintain a constant
optical extinction ratio over temperature and lifetime.
The MAX3738 accepts differential data input signals.
The wide 5mA to 60mA (up to 85mA AC-coupled) mod-
ulation current range and up to 100mA bias current
range, make the MAX3738 ideal for driving FP/DFB
lasers in fiber optic modules. External resistors set the
required laser current levels. The MAX3738 provides
transmit disable control (TX_DISABLE), single-point
fault tolerance, bias-current monitoring, and photocur-
rent monitoring. The device also offers a latched failure
output (TX_FAULT) to indicate faults, such as when the
APC loop is no longer able to maintain the average
optical power at the required level. The MAX3738 is
compliant with the SFF-8472 transmitter diagnostic and
SFP MSA timing requirements.
The MAX3738 is offered in a 4mm x 4mm, 24-pin thin
QFN package and operates over the extended -40°C to
+85°C temperature range.
19-3162; Rev 2; 12/08
Typical Application Circuit appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Multirate OC-3 to OC-48 FEC Transceivers
Gigabit Ethernet SFF/SFP and GBIC
Transceivers
1Gbps/2Gbps/4Gbps Fibre Channel SFF/SFP
and GBIC Transceivers
155Mbps to 4.25Gbps SFF/SFP Laser Driver
________________________________________________________________ Maxim Integrated Products
General Description
Applications
with Extinction Ratio Control
♦ Single +3.3V Power Supply
♦ 47mA Power-Supply Current
♦ 85mA Modulation Current
♦ 100mA Bias Current
♦ Automatic Power Control (APC)
♦ Modulation Compensation
♦ On-Chip Temperature Compensation
♦ Self-Biased Inputs for AC-Coupling
♦ Ground-Referenced Current Monitors
♦ Laser Shutdown and Alarm Outputs
♦ Enable Control and Laser Safety Feature
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX3738ETG
MAX3738ETG+
PART
TOP VIEW
MODTCOMP
TX_DISABLE
*THE EXPOSED PADDLE MUST BE SOLDERED TO SUPPLY
GROUND ON THE CIRCUIT BOARD.
PIN1 INDICATED BY + ON LEAD-FREE PACKAGE.
V
V
IN+
IN-
CC
CC
1
2
3
4
5
6
24
7
*EP
TEMP RANGE
-40°C to 85°C
-40°C to 85°C
Ordering Information
23
8
MAX3738
22
9
Pin Configuration
21
10
20
11
19
12
18
17
16
15
14
13
PIN-PACKAGE
24 Thin QFN-EP*
24 Thin QFN-EP*
MD
V
OUT+
OUT-
V
BIAS
Features
CC
CC
1

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MAX3738ETG+T Summary of contents

Page 1

... Transceivers 1Gbps/2Gbps/4Gbps Fibre Channel SFF/SFP and GBIC Transceivers Typical Application Circuit appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. with Extinction Ratio Control ♦ Single +3.3V Power Supply ♦ ...

Page 2

SFF/SFP Laser Driver with Extinction Ratio Control ABSOLUTE MAXIMUM RATINGS Supply Voltage V ...............................................-0.5V to +6.0V CC IN+, IN-, TX_DISABLE, TX_FAULT, SHUTDOWN, BC_MON, PC_MON, APCFILT1, APCFILT2, MD, TH_TEMP, MODTCOMP, MODBCOMP, MODSET, and APCSET Voltage.............-0. Stresses ...

Page 3

SFF/SFP Laser Driver ELECTRICAL CHARACTERISTICS (continued +2.97V to +3.63V -40°C to +85°C. Typical values are otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL APC Loop Time Constant APC Setting Stability ...

Page 4

SFF/SFP Laser Driver with Extinction Ratio Control (V = +3.3V 0.01µ 20mA APC BIAS OPTICAL EYE DIAGRAM 7 (2.7Gbps PRBS, 2.3GHz FILTER) MAX3738 toc01 1310nm FP LASER r ...

Page 5

SFF/SFP Laser Driver (V = +3.3V 0.01µ 20mA APC BIAS PHOTODIODE CURRENT vs. R 1.4 1.2 1.0 0.8 0.6 0.4 0 (kΩ) APCSET RANDOM JITTER vs. MODULATION ...

Page 6

SFF/SFP Laser Driver with Extinction Ratio Control (V = +3.3V 0.01µ 20mA APC BIAS HOT PLUG WITH TX_DISABLE LOW 3. t_init = 59.6ms 0V LOW FAULT TX_DISABLE LOW LASER ...

Page 7

SFF/SFP Laser Driver PIN NAME Modulation-Current Compensation from Temperature. A resistor at this pin sets the temperature 1 MODTCOMP coefficient of the modulation current when above the threshold temperature. Leave open for zero temperature compensation ...

Page 8

SFF/SFP Laser Driver with Extinction Ratio Control VOLTAGE SINGLE ENDED V IN+ V IN- DIFFERENTIAL ( IN+ IN- CURRENT I OUT+ TIME Figure 1. Required Input Signal and Output Polarity SOURCE NOISE VOLTAGE ...

Page 9

SFF/SFP Laser Driver INPUT BUFFER IN+ IN- SHUTDOWN SAFETY LOGIC TX_FAULT POWER DETECTOR TX_DISABLE R = 45kΩ PULL PC_MON R PC_MON I BIAS 82 T > BC_MON R BC_MON T ...

Page 10

SFF/SFP Laser Driver with Extinction Ratio Control V CC POR AND COUNTER 60ms DELAY TX_DISABLE COUNTER 60ms DELAY PC_MON PC_MON I BIAS 82 BC_MON R BC_MON Figure 5. Simplified ...

Page 11

SFF/SFP Laser Driver Table 2. Circuit Responses to Various Single-Point Faults CIRCUIT RESPONSE TO OVERVOLTATGE OR PIN SHORT TO V TX_FAULT Does not affect laser power. TX_DISABLE Modulation and bias currents are disabled. The optical average power ...

Page 12

SFF/SFP Laser Driver with Extinction Ratio Control Table 3. Optical Power Relations PARAMETER SYMBOL Average Power P AVG Extinction Ratio r e Optical Power of a One Optical Power of a Zero P ...

Page 13

SFF/SFP Laser Driver Current Compliance (I The minimum voltage at the OUT+ and OUT- pins is 0.7V. For Diode bias point voltage (1.2V typ) DIODE R = Diode bias point resistance (5Ω typ ...

Page 14

SFF/SFP Laser Driver with Extinction Ratio Control Layout Considerations To minimize loss and crosstalk, keep the connections between the MAX3738 output and the laser diode as short as possible. Use good high-frequency layout techniques and multilayer boards ...

Page 15

SFF/SFP Laser Driver 0.1μF CDR 100Ω 0.1μF R MODBCOMP R MODTCOMP R TH_TEMP REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE. For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 24 TQFN-EP ______________________________________________________________________________________ with Extinction ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products DESCRIPTION resistor to the Typical Application Circuit ...

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