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PDF MAX3656 Data sheet ( Hoja de datos )
| Número de pieza | MAX3656 | |
| Descripción | 155Mbps to 2.5Gbps Burst-Mode Laser Driver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2790; Rev 1; 5/04
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
General Description
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.
Applications
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
Pin Configuration
TOP VIEW
24 23 22 21 20 19
VCC 1
18 VCC
IN+ 2
17 OUT-
IN- 3
VCC 4
MAX3656
16 OUT+
15 VCC
BEN+ 5
14 BIAS+
BEN- 6
13 BIAS-
7 8 9 10 11 12
Features
o Multirate Operation from 155Mbps to 2.5Gbps
o Burst Enable/Disable Delay <2ns
o Burst On-Time of 576ns to Infinity
o Infinite Bias-Current Hold Time Between Bursts
o DC-Coupled Operation with Single +3.3V Power
Supply
o 40mA Typical Supply Current
o Programmable Bias Current from 1mA to 70mA
o Programmable Modulation Current from 10mA
to 85mA
o Automatic Average Power Control with Failure
Monitor (No CAPC Capacitor Needed)
o APC Loop Initialization ≤3 Bursts
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX3656E/D
— Dice*
—
MAX3656ETG -40°C to +85°C 24 Thin QFN-EP** T2444-1
MAX3656ETG+ -40°C to +85°C 24 Thin QFN-EP** —
+ Denotes lead-free package.
*Dice are designed to operate from TJ = -40°C to +120°C, but
are only tested and guaranteed at TA = +25°C.
**EP = Exposed pad.
Functional Diagram appears at end of data sheet.
Typical Application Circuit
VCC
SERIAL
DATA
SOURCE
BURST
CONTROL
100Ω
100Ω
IN+
IN-
MAX3656
BEN+
OUT-
OUT+
BIAS+
BIAS-
MD
BEN-
VCC
VCC
THIN QFN
**EXPOSED PAD IS CONNECTED TO GND
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
BEN+
BEN-
IBIAS
+
IMOD
ENABLE DELAY
BEN ±MIDPOINT
10% OF IBIAS
IFINAL × 110%
IFINAL
IFINAL × 90%
DISABLE DELAY
Figure 1. Enable and Disable Delay Times
VCC
22.1Ω
OUT-
MAX3656
OUT+
BIAS+
BIAS-
49.9Ω VCC
IMOD
VCC
22.1Ω
Z0 = 50Ω
26.7Ω
IBIAS
Z0 = 50Ω
121Ω VCC
OSCILLOSCOPE
50Ω
50Ω
26.7Ω
35.7Ω
Figure 2. Output Termination for Characterization
(TA = +25°C, unless otherwise noted.)
OPTICAL EYE DIAGRAM
(155.52Mbps, 117MHz FILTER,
PATTERN = PRBS 27 - 1 + 80 CID)
MAX3656 toc01
Typical Operating Characteristics
OPTICAL EYE DIAGRAM
(622.08Mbps, 467MHz FILTER,
PATTERN = PRBS 27 - 1 + 80 CID)
MAX3656 toc02
OPTICAL EYE DIAGRAM
(1.25Gbps, 933MHz FILTER,
PATTERN = PRBS 27 - 1 + 80 CID)
MAX3656 toc03
EXCELIGHT SLT3120-DN LASER
AVERAGE OPTICAL POWER = -4dBm
EXTINCTION RATIO = 15.2dB
MASK MARGIN = 42%
EXCELIGHT SLT3120-DN LASER
AVERAGE POWER = -4dBm
EXTINCTION RATIO = 15.1dB
MASK MARGIN = 30%
EXCELIGHT SLT3120-DN LASER
AVERAGE POWER = -3.5dBm
EXTINCTION RATIO = 14dB
MASK MARGIN = 23%
_______________________________________________________________________________________ 5
5 Page 
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
Running Burst Enable
Single Ended
With PECL signal levels, for single-ended operation of
burst enable, connect the BEN+ to the burst-enable
control. Connect a resistor (R1) from VCC to BEN- and
resistor (R2) from BEN- to ground. The parallel combina-
tion of R1 and R2 should be less than 1kΩ. Choose the
values of R1 and R2 to set the common-mode voltage in
the range defined in the Electrical Characteristics table
(see Figure 6).
With LVTTL or LVCMOS signal levels, for single-ended
operation of burst enable connect a 4kΩ (R4) resistor
from the burst-enable signal to BEN+. Connect a 1kΩ
(R3) resistor from VCC to BEN+. Connect a 1kΩ resistor
(R5) from VCC to BEN- and a 9kΩ resistor (R6) from
BEN- to ground. The parallel combination of R5 and R6
should be less than 1kΩ. For typical LVTTL or LVCMOS
specifications of VCC to 2.8V for a high and 0.4V to 0V
for a low, the LVTTL or LVCMOS sources zero current
and sinks a maximum of 720µA ((3.6V to 0V) / 5kΩ).
See Figure 7 for setting up the single-ended LVTTL or
LVCMOS biasing for burst enable.
Applications Information
This section provides an example of how to set up the
MAX3656.
Select Laser
Select a communication-grade laser for the proper data
rate. Assume the laser output average power is PAVG =
0dBm, the operating temperature is -40°C to +85°C,
and the laser diode has the following characteristics:
ZO = 50Ω
ZO = 50Ω
ZO = 50Ω
ZO = 50Ω
VCC
130Ω
IN+
82Ω VCC
130Ω
MAX3656
IN-
82Ω
VCC
130Ω
82Ω VCC
BEN+
130Ω
BEN-
82Ω
ZO = 50Ω
ZO = 50Ω
100Ω
ZO = 50Ω
ZO = 50Ω
100Ω
IN+
IN-
MAX3656
BEN+
BEN-
Figure 5. Connecting to CML Outputs
VCMBEN + (100mV to 800mV)
VCMBEN
VCMBEN - (100mV to 800mV)
3.3V
R1 = 1.65kΩ
VCMBEN = +2.0V
R2 = 2.54kΩ
IN+
IN-
BEN+
BEN-
MAX3656
Figure 4. Connecting to PECL Outputs
Figure 6. Single-Ended Biasing for Burst Enable
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX3656.PDF ] | |
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