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MAX3798 fiches techniques PDF

Maxim Integrated Products - Low-Power SFP Limiting Amplifier and VCSEL Driver

Numéro de référence MAX3798
Description Low-Power SFP Limiting Amplifier and VCSEL Driver
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products 





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MAX3798 fiche technique
19-4360; Rev 0; 10/08
www.DataSheet4U.com
1.0625Gbps to 10.32Gbps, Integrated, Low-
Power SFP+ Limiting Amplifier and VCSEL Driver
General Description
The MAX3798 is a highly integrated limiting amplifier
and VCSEL driver designed for 1x/2x/4x/8x Fibre
Channel transmission systems at data rates up to
8.5Gbps as well as for 10GBASE-SR transmission sys-
tems at a data rate of 10.3125Gbps. Operating from a
single +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 50Ω transmission line PCB design.
The use of a 3-wire digital interface reduces the pin
count while enabling advanced Rx (mode selection,
LOS threshold, LOS squelch, LOS polarity, CML output
level, signal path polarity, slew-rate control, deempha-
sis, and fast mode-select change time) and Tx settings
(modulation current, bias current, polarity, programma-
ble deemphasis, eye-crossing adjustment, and eye
safety control) without the need for external compo-
nents. The MAX3798 provides multiple current and volt-
age DACs to allow the use of low-cost controller ICs.
The MAX3798 is packaged in a lead-free, 5mm x 5mm,
32-pin TQFN package.
Applications
10GBASE-SR SFP+ Optical Transceiver
1x/2x/4x/8x SFF/SFP/SFP+ MSA Fibre Channel
(FC) Optical Transceiver
10GBASE-LR SFP+ Optical Transceiver (1310nm
VCSEL)
10GBASE-LRM SFP+ Optical Transceiver
(1310nm VCSEL)
Features
Low Power Dissipation of 320mW at 3.3V Power
Supply
Up to 10.32Gbps (NRZ) Operation
3mVP-P Receiver Sensitivity at 10.32Gbps
4psP-P DJ at Receiver Output at 8.5Gbps 8B/10B
4psP-P DJ at Receiver Output at 10.32Gbps
231 - 1 PRBS
26ps Rise and Fall Time at Rx/Tx Output
Mode Select for High-Gain Mode and High-
Bandwidth Mode
CML Output Slew-Rate Adjustment for High-Gain
Mode
CML Output with Continuous Level Adjustment
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
Selectable Deemphasis at Rx Output
3-Wire Digital Interface
Eye-Crossing Adjustment of Modulation Output
Programmable Deemphasis at Tx Output
Fast Mode-Select Change Time of 10µs
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3798ETJ+
-40°C to +85°C
32 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit and Pin Configuration appear at
end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.

PagesPages 35
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