MAX3643 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Burst-Mode Laser Driver

19-3848; Rev 0; 11/05
Burst-Mode Laser Driver
General Description
The MAX3643 burst-mode laser driver provides bias
and modulation current drive for PON burst-mode ONT
applications. 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 (out-
put off) condition to full on-condition in less than 2ns.
When BEN is inactive, typical modulation and bias cur-
rents 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
155/622/1244Mbps A/B/GPON ONT Modules
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
MAX3643ETG -40°C to +85°C
MAX3643ETG+ -40°C to +85°C
*EP = Exposed paddle.
+Denotes lead-free package.
PIN-
PACKAGE
24 TQFN-EP*
24 TQFN-EP*
PKG
CODE
T2444-3
T2444-3
Pin Configuration appears at end of data sheet.
Typical Application Circuit
+3.3V
+3.3V
FILTER
VCC
OUT-
IN+
OUT+
IN-
BIAS+
MAX3643
BEN+
BIAS-
BEN-
EN
IMAX
BCMON
VREF VMSET
MODSET
MDIN
VBSET
MDOUT
BIASSET BENOUT GND
0.1µF
27nH
24Ω
15Ω
10Ω
10Ω
RCOMP
15Ω
VCC
CCOMP
1kΩ
3kΩ 1kΩ
1kΩ
1kΩ
ANALOG OUT
ANALOG OUT
ANALOG IN
START CONVERT
ANALOG IN
ANALOG IN
CONTROL
CONTROLLER
CONTINUOUS
OPERATION
________________________________________________________________ Maxim Integrated Products 1
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