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 systems 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 amplifier 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, deemphasis, and fast mode-select change time) and Tx settings (modulation current, bias current, polarity, programmable deemphasis, eye-crossing adjustment, and eye safety control) without the need for external components. The MAX3798 provides multiple current and voltage 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.
Key Features
Applications/Uses
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
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
Download
E-Mail
