Analog Devices Inc./Maxim Integrated MAX3298CUE

Overview

MAX3298CUE from Maxim Integrated is a 2.5Gbps high-speed laser driver IC optimized for fiber optic LAN transmitters, integrating bias generation with automatic power control (APC), laser modulation, dual enable/shutdown safety circuitry, and programmable temperature compensation. It delivers 30mA modulation current into 25Ω, supports common-anode or common-cathode laser pinning, and achieves 7ps deterministic jitter at 2.5Gbps for Fibre Channel and Gigabit Ethernet optical transmitters.

For engineers reviewing the MAX3298CUE datasheet, MAX3298CUE pinout, MAX3298CUE application, or MAX3298CUE equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts for 2.5Gbps laser driver replacement, and supply-chain support details specific to the 16-pin TSSOP-EP package.

Technical Context

The MAX3298CUE implements a dual-path modulation current generator with independent MODSET (temperature-stable component) and TC (temperature-increasing component) programming pins, enabling precise extinction ratio control across –40°C to +85°C. Its APC loop uses MD input feedback to maintain constant average optical power via external PNP/NPN bias transistor driven by BIASDRV.

Safety architecture includes dual latched FAULT/FAULT outputs, redundant SHDNDRV shutdown driver, programmable FLTDLY fault delay, and comprehensive single-point fault detection on REF, MD, MON, POL, MODSET, and TC - all compliant with IEC 60825-1 Class 1 laser safety requirements for optical transmitters.

Key Specifications

Pinout & Package

MAX3298CUE is housed in a 16-pin thermally enhanced TSSOP package (5mm × 4.4mm) with exposed ground pad (EP) soldered to PCB for optimal thermal performance. Pin numbering follows standard TSSOP convention, with EP internally connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2.5Gbps laser driver applications.

Compared with MAX3296CUE and LMH6570MA/NOPB, the MAX3298CUE uniquely integrates APC, dual safety enables/faults, and MON-based VCSEL bias in a thermally optimized TSSOP-EP - reducing system-level validation effort and PCB area for certified optical transmitters.

Availability

MAX3298CUE is available at Aetrix Electronics and suitable for Gigabit Ethernet optical transceivers, Fibre Channel line cards, ATM network interfaces, and industrial fiber data links requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MAX3298CUE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and high-speed interface solutions for communications, industrial, and computing markets.

The MAX3296/MAX3298 series was designed specifically for cost-sensitive, safety-critical 2.5Gbps fiber optic transmitter applications - emphasizing integrated laser control, deterministic jitter minimization, and IEC 60825-compliant fault handling.

FAQ

What is the maximum data rate supported by the MAX3298CUE?

The MAX3298CUE is specified and characterized for reliable 2.5Gbps operation, meeting Fibre Channel FC-PI-2 and IEEE 802.3z requirements. Its 7ps deterministic jitter and 30mA modulation drive ensure full compliance with eye mask specifications at this rate. While the MAX3286 series supports 1.25Gbps, the MAX3298CUE belongs to the MAX3296 family explicitly optimized for 2.5Gbps - confirmed in the datasheet's Ordering Information and Electrical Characteristics tables.

Does the MAX3298CUE support both common-anode and common-cathode laser configurations?

Yes, the MAX3298CUE supports both configurations via the POL and POL pins. Setting POL = VCC and POL = GND configures common-cathode mode; POL = GND and POL = VCC configures common-anode mode - as defined in Table 4 of the datasheet. This flexibility allows use with industry-standard DFB lasers (common cathode) and certain VCSEL packages (common anode), with corresponding bias transistor selection (PNP vs. NPN).

How does the MAX3298CUE implement automatic power control (APC) without an external microcontroller?

The MAX3298CUE implements fully autonomous APC using its internal power-control amplifier, reference generator, and window comparator. When MD is connected to a laser's monitor photodiode, the IC regulates BIASDRV output to maintain constant average optical power - independent of temperature or laser aging. No firmware or external controller is needed, as confirmed in the Detailed Description section and Figure 3 bias generator schematic.

What is the purpose of the MON pin on the MAX3298CUE, and how does it differ from MD?

The MON pin on the MAX3298CUE enables direct current-mode biasing for VCSELs that lack an integrated monitor photodiode. Unlike MD - which closes the APC feedback loop using photodiode current - MON accepts a voltage reference to set fixed bias current, eliminating external sense resistors. This distinction is explicitly documented in the Pin Description table and Design Procedure section for VCSEL applications.

Can the MAX3298CUE be used in industrial temperature range applications?

The MAX3298CUE is rated for 0°C to +70°C ambient operation per its Ordering Information table. While the die itself operates up to +150°C junction temperature, the packaged device is not characterized or guaranteed beyond +70°C. For extended temperature applications, engineers should verify thermal design margins using the 45°C/W θ_JA value and derate accordingly - as stated in the Absolute Maximum Ratings and Typical Operating Characteristics sections.