Rainbow Electronics MAX3799 - Manual

General Description
The MAX3799 is a highly integrated limiting amplifier
and VCSEL driver that operates up to 14Gbps, making
it suitable for Ethernet and Fibre Channel applications.
By providing a selectable data path with a noise-shap-
ing filter, the MAX3799 enables a module with 10G
optics to be fully compliant with both 1000BASE-SR
and 10GBASE-SR specifications. Operating from a sin-
gle +3.3V supply, this low-power integrated limiting
amplifier and VCSEL driver IC enables a platform
design for SFP MSA as well as for SFP+ MSA-based
optical transceivers. The high-sensitivity limiting ampli-
fier limits the differential input signal generated by a
transimpedance amplifier into a CML-level differential
output signal. The compact VCSEL driver provides a
modulation and a bias current for a VCSEL diode. The
optical average power is controlled by an average
power control (APC) loop implemented by a controller
that interfaces to the VCSEL driver through a 3-wire
digital interface. All differential I/Os are optimally back-
terminated for a 50
Ω transmission line PCB design.
The use of a 3-wire digital interface reduces the pin
count while enabling advanced Rx (rate selection, LOS
threshold, LOS squelch, LOS polarity, CML output level,
signal path polarity, deemphasis, and fast mode-select
change time) and Tx settings (modulation current, bias
current, polarity, and eye safety control) without the
need for external components. The MAX3799 provides
multiple current and voltage DACs to allow the use of
low-cost controller ICs.
The MAX3799 is packaged in a lead-free, 5mm x 5mm,
32-pin TQFN package.
Applications
1000BASE-SR/10GBASE-SR Multirate SFP+
Optical Transceiver
1x/2x/4x/8x/16x SFF/SFP/SFP+ MSA Fibre
Channel (FC) Optical Transceiver
Features
♦ Enables Single-Module Design Compliance with
1000BASE-SR and 10GBASE-SR Specifications
♦ -21.5dBm Optical Sensitivity at 1.25Gbps Using a
10.32Gbps ROSA (-19.7dBm OMA)
♦ Low Power Dissipation of 320mW at 3.3V Power
Supply
♦ Typical Electrical Performance of 14.025Gbps on
Rx/Tx (Non-Retimed 16x Fibre Channel Solution)
♦ 3mV
P-P
Receiver Sensitivity at 10.32Gbps
♦ 4ps
P-P DJ at Receiver Output at 8.5Gbps 8B/10B
♦ 4ps
P-P DJ at Receiver Output at 10.32Gbps
2 31 - 1 PRBS
♦ 26ps Rise and Fall Time at Rx/Tx Output
♦ Rate Select for 1Gbps Mode or 10Gbps Mode
♦ CML Output Squelch
♦ Polarity Select for Rx and Tx
♦ LOS Assert Level Adjustment
♦ LOS Polarity Select
♦ Modulation Current Up to 12mA Into 100Ω
Differential Load
♦ Bias Current Up to 15mA
♦ Integrated Eye Safety Features
♦ 3-Wire Digital Interface
♦ Programmable Deemphasis at Tx Output
MAX3799
1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-4695; Rev 0; 8/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
PART TEMP RANGE PIN-PACKAGE
MAX3799ETJ+ -40
°C to +85°C 32
TQFN-EP*
Typical Application Circuit and Pin Configuration appear at
end of data sheet.