MAX3643_14 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – 155Mbps to 2.5Gbps Burst-Mode Laser Driver

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
130Ω 130Ω
SERIAL
Z0 = 50Ω
IN+
DATA
SOURCE
Z0 = 50Ω
IN-
82Ω 82Ω
3.3V
+3.3V
FILTER
VCC
MAX3643
130Ω 130Ω
BURST
Z0 = 50Ω
BEN+
CONTROL
Z0 = 50Ω
BEN-
82Ω 82Ω
3kΩ
1kΩ
15Ω
10nH
15Ω
OUT-
5.6Ω
OUT+
5.6Ω
BIAS+
10Ω
BIAS-
MDIN
75Ω
27pF
+3.3V
10pF
1kΩ
MDOUT
1kΩ
BMD
MON1
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