MAX3798

NOT RECOMMENDED FOR NEW DESIGNS

1.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver

Industry's First Combination VCSEL Driver and Limiting Amp for 10G SFP+ Ethernet and Fibre Channel

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.99

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Overview

Low Power Dissipation of 320mW at 3.3V Power Supply
Up to 10.32Gbps (NRZ) Operation
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 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

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.

Applications

10GBASE-LR SFP+ Optical Transceiver (1310nm VCSEL)
10GBASE-LRM SFP+ Optical Transceiver (1310nm VCSEL)
10GBASE-SR SFP+ Optical Transceiver
1x/2x/4x/8x SFF/SFP/SFP+ MSA Fibre Channel (FC) Optical Transceiver

Part Models: 2
1ku List Price: Starting From $3.99

Documentation

Data Sheet 1

MAX3798: 1.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver Data Sheet (Rev.0) 11/10/2008

Reliability Data 1

MAX3798 Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX3798ETJ+	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX3798ETJ+T	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 14, 2023 - 2275A WAFER FAB
		pcn_2275a
MAX3798ETJ+
MAX3798ETJ+T

This is the most up-to-date revision of the Data Sheet.

Tools & Simulations

Software Development 1

MAX3798EVKIT Software, 1.0.0

Evaluation Kits

Evaluation Kit for the MAX3798

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Features and Benefits

Fully Assembled and Tested
Software Control Through USB Port
SMA Connectors for High-Speed Inputs and Outputs
Powered by +3.3V Supply and USB Port
Indicator for USB Power

Product Details

The MAX3798 evaluation kit (EV kit) is an assembled electrical demonstration board that provides easy computer-controlled evaluation of the MAX3798 multirate limiting amplifier and VCSEL driver. The included software communicates with the EV kit through the USB port and provides access to all the internal registers to optimize the MAX3798 functionality. A +3.3V supply and USB port powers the EV kit. SMA connectors are used for the high-speed inputs and outputs. An LED indicates the status of USB power.