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19-5943; Rev 0; 6/11
E V A L U A T I O N K I T A V A I L A B L E
MAX3948
11.3Gbps, Low-Power, DC-Coupled Laser Driver
General Description
Benefits and Features
The MAX3948 is a 3.3V, multirate, low-power laser diode
driver designed for Ethernet, Fibre Channel, and SONET
transmission systems at data rates up to 11.3Gbps. This
device is optimized to drive a differential transmitter
optical subassembly (TOSA) with a 25I flex circuit. The
unique design of the output stage enables DC-coupling
to unmatched TOSAs, thereby lowering transmitter power
consumption by more than 100mW.
SꢀLowestꢀPowerꢀConsumption
ꢀ168mWꢀTypicalꢀICꢀPowerꢀDissipationꢀatꢀ3.3V
(LD ꢀ=ꢀ40mA,ꢀLD ꢀ=ꢀ20mA)
ꢀ
MOD
DC
ꢀ383mWꢀTotalꢀTransmitterꢀPowerꢀDissipationꢀat
3.3VꢀIncludingꢀLD ꢀ=ꢀ40mA,ꢀLD ꢀ=ꢀ20mA
ꢀ
MOD
DC
ꢀEnablesꢀ<ꢀ1WꢀMaximumꢀTotalꢀSFP+ꢀModule
PowerꢀDissipationꢀ
ꢀEnablesꢀ<ꢀ2.5WꢀMaximumꢀTotalꢀQSFP+ꢀModule
PowerꢀDissipation
ꢀ
ꢀ
The MAX3948 receives differential AC-coupled signals
with on-chip termination. It can deliver laser modula-
tion currents of up to 85mA at an edge speed of 26ps
(20% to 80%) into a 5I external differential load. The
device is designed to have a high-bandwidth differen-
tial signal path with on-chip back termination resistors
integrated into its outputs. An input equalization block
can be activated to compensate for SFP+/QSFP+ host
connector losses. The integrated DC circuit provides
programmable laser DC currents up to 61mA. Both the
laser DC current generator and the laser modulator can
be disabled from a single pin.
SꢀSavesꢀBoardꢀSpace
ꢀSmallꢀ3mmꢀxꢀ3mmꢀPackage
ꢀDC-CouplingꢀtoꢀtheꢀLaserꢀReducesꢀExternal
ꢀ
ComponentꢀCount
SꢀFlexibility
ꢀOperateꢀUpꢀtoꢀFourꢀMAX3948ꢀICsꢀOverꢀSingle
ꢀ
3-WireꢀDigitalꢀInterfaceꢀ
ꢀProgrammableꢀModulationꢀCurrentꢀUpꢀto
85mAꢀ(5ωꢀLoad)
ꢀProgrammableꢀDCꢀCurrentꢀUpꢀtoꢀ61mA
(TranslatesꢀtoꢀUpꢀtoꢀ100mAꢀLaserꢀBiasꢀCurrent)ꢀ
ꢀProgrammableꢀInputꢀEqualizationꢀandꢀOutput
Deemphasis
SꢀSafety
ꢀSupportsꢀSFF-8431ꢀSFP+ꢀMSAꢀandꢀSFF-8472
DigitalꢀDiagnosticꢀ
ꢀIntegratedꢀEyeꢀSafetyꢀFeaturesꢀwithꢀMaskable
Faultsꢀ
ꢀ
ꢀ
The device offers one dedicated pin (VSEL) to program up
to four channel addresses for multichannel applications.
ꢀ
The use of a 3-wire digital interface reduces the pin count
while permitting adjustment of input equalization, polar-
ity, output deemphasis, and modulation and DC currents
without the need for external components. The MAX3948
is available in a 3mm x 3mm, 16-pin TQFN package, and
is specified for the -40NC to +95NC extended temperature
range.
ꢀ
ꢀ
ꢀDCꢀCurrentꢀMonitor
Applications
40GBASE-LR4 QSFP+ Optical Transceivers
10GBASE-LR SFP+ Optical Transceivers
10GBASE-LRM SFP+ Optical Transceivers
OC192-SR SFP+ SDH/SONET Transceivers
Ordering Information appears at end of data sheet.
ForꢀinformationꢀonꢀotherꢀMaximꢀproducts,ꢀvisitꢀMaxim’sꢀwebsiteꢀatꢀwww.maxim-ic.com.
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