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PDF MAX3643 Data sheet ( Hoja de datos )
| Número de pieza | MAX3643 | |
| Descripción | 155Mbps to 2.5Gbps Burst-Mode Laser Driver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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EVALUATION KIT AVAILABLE
MAX3643
155Mbps to 2.5Gbps Burst-Mode Laser Driver
General Description
The MAX3643 burst-mode laser driver provides bias and
modulation current drive for PON burst-mode ONT appli-
cations. It is specifically designed for use with a low-cost
external controller for the APC (and if desired, AMC) loop.
A high-speed differential burst-enable input enables the
driver to switch the laser from a dark (output off) condition
to full on-condition in less than 2ns. When BEN is inac-
tive, typical modulation and bias currents are 5µA each.
Laser modulation current can be set from 10mA to
85mA and bias current can be set from 1mA to 70mA
using the MODSET and BIASSET inputs. A sample-and-
hold circuit is provided to capture the monitor diode
output during short PON bursts, if needed, and the BEN
high-speed signal is mirrored on an LVCMOS output to
be used by the controller operating the APC/AMC loop.
The MAX3643 burst-mode laser driver is packaged in a
4mm x 4mm, 24-pin thin QFN package. It operates from
-40°C to +85°C.
Applications
A/B/G/XGPON ONT Modules Up to 2.5Gbps
1.25Gbps IEEE EPON ONT Modules
Features
♦ 10mA to 85mA Modulation Current
♦ 1mA to 70mA Bias Current
♦ Monitor Diode Sample and Hold
♦ 45ps Output Transition Time
♦ 2ns Turn-On/-Off Time
♦ Reference Voltage Generator
♦ LVPECL High-Speed Inputs (Data, Burst Enable)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3643ETG
-40°C to +85°C 24 TQFN-EP*
MAX3643ETG+
-40°C to +85°C 24 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed paddle.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
3.3V
3.3V
SERIAL
DATA
SOURCE
130Ω 130Ω
Z0 = 50Ω
Z0 = 50Ω
82Ω 82Ω
IN+
IN-
3.3V
+3.3V
FILTER
VCC
MAX3643
BURST
CONTROL
130Ω 130Ω
Z0 = 50Ω
Z0 = 50Ω
82Ω 82Ω
BEN+
BEN-
3kΩ
1kΩ
15Ω 10nH
OUT-
OUT+
BIAS+
15Ω
5.6Ω
5.6Ω
BIAS-
10Ω
MDIN
75Ω
27pF
+3.3V
10pF
1kΩ
MDOUT
1kΩ
MON1
BMD
DS1875
PON TRIPLEXER AND SFP
CONTROLLER
BEN
BIAS
MOD
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-3848; Rev 4; 12/12
1 page  
MAX3643
155Mbps to 2.5Gbps Burst-Mode Laser Driver
Typical Operating Characteristics
(Typical values are at VCC = 3.3V, TA = +25°C, data pattern = 27-1 PRBS + 80 ones + 27-1 PRBS + 80 zeros, unless otherwise
noted.)
OPTICAL EYE DIAGRAM
(155.52Mbps, 117MHz FILTER,
PATTERN = 223 - 1 PRBS)
MAX3643 toc01
OPTICAL EYE DIAGRAM
(622.08Mbps, 467MHz FILTER,
PATTERN = 223 - 1 PRBS)
MAX3643 toc02
OPTICAL EYE DIAGRAM
(1.24416Gbps, 933MHz FILTER,
PATTERN = 223 - 1 PRBS)
MAX3643 toc03
EXCELIGHT SLT2886-LR LASER
AVERAGE OPTICAL POWER = -6dBm
EXTINCTION RATIO = 15dB
MASK MARGIN = 49%
OPTICAL EYE DIAGRAM
(2.48832Gbps, 2.3GHz FILTER,
PATTERN = 223 - 1 PRBS)
MAX3643 toc04
EXCELIGHT SLT2886-LR LASER
AVERAGE OPTICAL POWER = -6dBm
EXTINCTION RATIO = 10dB
MASK MARGIN = 18%
EXCELIGHT SLT2886-LR LASER
AVERAGE OPTICAL POWER = -6dBm
EXTINCTION RATIO = 15dB
MASK MARGIN = 45%
ELECTRICAL EYE DIAGRAM
(2.5Gbps, IMOD = 30mA,
PATTERN = PRBS 27 - 1 + 80 CID)
MAX3643 toc05
100ps/div
EXCELIGHT SLT2886-LR LASER
AVERAGE OPTICAL POWER = -6dBm
EXTINCTION RATIO = 14dB
MASK MARGIN = 38%
SUPPLY CURRENT vs. TEMPERATURE
(IBIAS = 20mA, IMOD = 30mA)
60
55
EXCLUDES BIAS AND
MODULATION CURRENT
50
45
40
35
30
25
20
15
10
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
Maxim Integrated
5
5 Page 
MAX3643
155Mbps to 2.5Gbps Burst-Mode Laser Driver
BURST-ENABLE (BEN±) IN
≤ 125μs FOR BPON/GPON
INTERNAL MDIN VOLTAGE SAMPLER
BENOUT OUTPUT
3μs
MDOUT
1.2V
100μs
< 2.56mV
Figure 2. Sample-and-Hold Timing Diagram
Enable Input
An LVCMOS input, EN, is provided to disable both bias
and modulation currents under external control. The
maximum time to disable laser current with the EN con-
trol is 375ns.
Setting the Current Limit
A current limiter is provided to protect the laser diode
by shutting down both bias and modulation currents
when total current exceeds a value set by the resistor
connected from IMAX to ground. Do not use less than
3kΩ RIMAX. See the IBIAS + IMOD Current Threshold vs.
RIMAX graph in the Typical Operating Characteristics.
Programming the MODSET and
BIASSET Inputs
To program the laser modulation current using a cur-
rent DAC, connect VMSET to VREF, attach the DAC to
the MODSET pin and set the current according to:
IMOD = IMODSET x 88
To program the laser modulation current using a resis-
tor or digital potentiometer, connect VMSET to VREF,
attach a resistor from the MODSET pin to ground, and
set the current according to:
IMOD
=
1.2V
RMODSET + RMOD
× 88
To program the laser modulation current using a PWM
voltage DAC (requiring a high-impedance load), attach
a DAC output to the VMSET pin, connect a resistor from
the MODSET pin to ground as shown in the Typical
Applications Circuit, and set the current according to:
IMOD
=
VDAC
RMODSET + RMOD
×
88
Maxim Integrated
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX3643.PDF ] | |
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