MAX3656ETG+T Maxim Integrated Products, MAX3656ETG+T Datasheet

IC LASR DRVR 2.5GBPS 3.6V 24TQFN

MAX3656ETG+T

Manufacturer Part Number
MAX3656ETG+T
Description
IC LASR DRVR 2.5GBPS 3.6V 24TQFN
Manufacturer
Maxim Integrated Products
Type
Laser Diode Driver (Fiber Optic)r
Datasheet

Specifications of MAX3656ETG+T

Data Rate
2.5Gbps
Number Of Channels
1
Voltage - Supply
3 V ~ 3.6 V
Current - Supply
40mA
Current - Modulation
85mA
Current - Bias
70mA
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
Other names
MAX3656ETG+T
MAX3656ETG+TTR
The MAX3656 is a burst-mode laser driver that oper-
ates at data rates from 155Mbps up to 2.5Gbps. The
laser driver accepts either positive-referenced emitter-
coupled logic (PECL) or current-mode logic (CML) data
inputs and provides bias and modulation current for the
laser diode. The device can switch the laser diode from
a completely dark (off) condition to a full (on) condition
(with proper bias and modulation currents) in less than
2ns. The MAX3656 incorporates DC-coupling between
laser driver and laser diode and operates with a single-
supply voltage as low as +3.0V.
A digital automatic power-control (APC) loop is provided
to maintain the average optical power over the full tem-
perature range and lifetime. The APC loop is functional
for a minimum burst on-time of 576ns and minimum
burst off-time of 96ns, with no limit on the maximum
burst on- or off-time. A fail monitor is provided to indi-
cate when the APC loop can no longer maintain the
average power. The MAX3656 can be configured for
nonburst-mode applications (continuous mode) by con-
necting burst enable (BEN) high. For power saving, the
MAX3656 provides enabling and disabling functionality.
The modulation current can be set from 10mA to 85mA
and the bias current can be set from 1mA to 70mA.
The MAX3656 is packaged in a small, 24-pin, 4mm
4mm thin QFN package and consumes only 132mW
(typ), excluding bias and modulation currents.
19-2790; Rev 4; 9/10
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.
Fiber-to-the-Home (FTTH) and Fiber-to-the-
Business (FTTB) Broadband Access Systems
Passive Optical Network (PON) Transmitters
APON, EPON, and GPON Upstream Transmitters
TOP VIEW
*EXPOSED PAD IS CONNECTED TO GND
BEN+
BEN-
V
V
IN+
IN-
CC
CC
1
2
3
4
5
6
________________________________________________________________ Maxim Integrated Products
24
7
23
8
General Description
THIN QFN
22
MAX3656
9
Pin Configuration
21
10
20
11
*EP
Applications
19
12
155Mbps to 2.5Gbps Burst-Mode
18
17
16
15
14
13
V
OUT-
OUT+
V
BIAS+
BIAS-
CC
CC
♦ Multirate Operation from 155Mbps to 2.5Gbps
♦ Burst Enable/Disable Delay <2ns
♦ Burst On-Time of 576ns to Infinity
♦ Infinite Bias-Current Hold Time Between Bursts
♦ DC-Coupled Operation with Single +3.3V Power
♦ 40mA Typical Supply Current
♦ Programmable Bias Current from 1mA to 70mA
♦ Programmable Modulation Current from 10mA
♦ Automatic Average Power Control with Failure
♦ APC Loop Initialization ≤3 Bursts
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
Functional Diagram appears at end of data sheet.
MAX3656ETG
MAX3656ETG+
CONTROL
SOURCE
SERIAL
BURST
DATA
Supply
to 85mA
Monitor (No C
PART
130Ω
130Ω
82Ω
82Ω
+3.3V
130Ω
+3.3V
130Ω
82Ω
82Ω
Typical Application Circuit
APC
-40°C to +85°C
-40°C to +85°C
IN+
IN-
BEN+
BEN-
TEMP RANGE
Capacitor Needed)
Ordering Information
MAX3656
Laser Driver
+3.3V
BIAS+
OUT+
BIAS-
OUT-
MD
PIN-PACKAGE
24 Thin QFN-EP*
24 Thin QFN-EP*
5.6Ω
5.6Ω
15Ω
10Ω
Features
10Ω
+3.3V
+3.3V
75Ω
27pF
10nH
1

Related parts for MAX3656ETG+T

MAX3656ETG+T Summary of contents

Page 1

... THIN QFN *EXPOSED PAD IS CONNECTED TO GND ________________________________________________________________ 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. 155Mbps to 2.5Gbps Burst-Mode ♦ Multirate Operation from 155Mbps to 2.5Gbps ♦ Burst Enable/Disable Delay <2ns ♦ Burst On-Time of 576ns to Infinity ♦ ...

Page 2

Burst-Mode Laser Driver ABSOLUTE MAXIMUM RATINGS Supply Voltage, V ..............................................-0.5V to +6.0V CC Current into BIAS+, BIAS-, OUT+, OUT- ........-20mA to +150mA Current into MD.................................................... -5mA to +5mA Current into FAIL ...............................................-10mA to +10mA Voltage at IN+, ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) (Typical values are +3.3V BIAS PARAMETER SYMBOL V BEN+ Single-Ended Input Voltage V BEN- Input High Voltage V IH Input Low Voltage V Output High Voltage V OH Output Low Voltage V ...

Page 4

Burst-Mode Laser Driver ELECTRICAL CHARACTERISTICS (continued) (Typical values are +3.3V BIAS PARAMETER SYMBOL BURST-MODE SPECIFICATIONS Burst Enable Delay Burst Disable Delay Burst On-Time (Note 13) t B-ON Burst Off-Time (Note 13) t ...

Page 5

BEN+ BEN- I BIAS + I MOD 10 ENABLE DELAY Figure 1. Enable and Disable Delay Times (T = +25°C, unless otherwise noted.) A OPTICAL EYE DIAGRAM (155.52Mbps, 117MHz FILTER, 23 PATTERN = PRBS) MAX3656 ...

Page 6

Burst-Mode Laser Driver (T = +25°C, unless otherwise noted.) A OPTICAL EYE DIAGRAM (2.48832Gbps, 2.3GHz FILTER, 23 PATTERN = PRBS) MAX3656 toc04 EXCELIGHT SLT2886-LR LASER AVERAGE OPTICAL POWER = -6dBm EXTINCTION RATIO = 10dB ...

Page 7

APCSET 10,000 1000 100 10 0 (kΩ) APCSET TIMING DIAGRAM, BURST ON V MOD+ V BIAS+ 500ps/div _______________________________________________________________________________________ 155Mbps to 2.5Gbps Burst-Mode Typical Operating Characteristics (continued) ...

Page 8

Burst-Mode Laser Driver PIN NAME Power-Supply Voltage CC 15, 18 IN+ Noninverting Data Input with On-Chip Biasing 3 IN- Inverting Data Input with On-Chip Biasing 5 BEN+ Noninverting Burst-Enable Input with ...

Page 9

Detailed Description The MAX3656 laser driver has three main parts: a high- speed modulator, a high-speed bias driver, and a laser- biasing block with automatic power control (see the Functional Diagram ). Both the bias and modulation output stages are ...

Page 10

Burst-Mode Laser Driver APC loop reset), and then it is driven low (chip- enabled). In this case, APC loop initialization begins when the voltage at EN drops below the specified EN input low voltage of 0.8V. After ...

Page 11

Programming the APC Loop When using the MAX3656’s APC feature, program the average optical power by adjusting the APCSET resis- tor. To select this resistor, determine the desired moni- tor current to be maintained over temperature and lifetime. See the ...

Page 12

Burst-Mode Laser Driver Design Example Select a communication-grade laser for the proper data rate. Assume the laser output average power is P 0dBm, the operating temperature is -40°C to +85°C and the laser diode has the following ...

Page 13

R = 5kΩ 3 LVTTL OR LVCMOS HIGH R = 3kΩ 4 LVTTL OR LVCMOS LOW R = 5kΩ 9kΩ 6 Figure 7. Single-Ended LVTTL or LVCMOS Biasing for Burst Enable Applications Information Running Burst Enable Single-Ended ...

Page 14

Burst-Mode Laser Driver MAX3656 IN+ IN- BEN+ BEN- R MODSET Chip Information TRANSISTOR COUNT: 8153 PROCESS: SiGe BIPOLAR 14 ______________________________________________________________________________________ I MOD I BIAS APC DAC DSP ASP R R LONGB BIASMAX EN FAIL APCSET Package Information ...

Page 15

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2010 Maxim Integrated Products 155Mbps to 2 ...

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