MAX3748HETE+T

Overview

The MAX3748HETE+T is a compact, low-power multirate limiting amplifier designed for SONET, Fibre Channel, and Gigabit Ethernet optical receivers. It operates on a single 3.3V supply and supports data rates from 155Mbps to 4.25Gbps. The device features an 86ps rise/fall time, programmable loss-of-signal detection, and RSSI interface compatibility with the MAX3744 TIA. Packaged in a 3mm x 3mm 16-pin thin QFN with an exposed pad, it ensures controlled edge speeds and constant-level CML outputs.

Feature Summary

• SFP reference design available
• Single 3.3V supply voltage operation
• Programmable loss-of-signal threshold
• RSSI interface compatible with MAX3744 TIA

Applications

• Gigabit Ethernet SFF/SFP Transceiver Modules
• Fibre Channel SFF/SFP Transceiver Modules
• Multirate OC-3 to OC-48-FEC SFF/SFP Transceiver Modules

Procurement Notes

Verify RoHS compliance status through official manufacturer documentation, as suffixes indicate lead-free status. Confirm package dimensions against the latest land pattern drawings provided by Analog Devices/Maxim Integrated. Ensure ordering information matches the specific temperature range and pin configuration required for the target application.

Selection Notes

Select this component for applications requiring a compact limiting amplifier with integrated signal diagnostics. The device is optimized for use with the MAX3744 TIA to meet SFF-8472 digital diagnostic specifications. Consider the offset correction requirements based on the data coding scheme, such as using capacitors for SONET or leaving pins open for Fibre Channel.

Part Context

The MAX3748H is part of Maxim Integrated's portfolio of high-speed optical receiver support circuits. It serves as a data quantizer for various optical networking standards. The device integrates gain stages, offset correction, and power detection to provide a complete solution for small form-factor transceivers.

Replacement Considerations

Consult official manufacturer resources for confirmed substitute part numbers. Verify functional compatibility and pinout alignment before considering alternatives.

FAQ

How is the Loss-of-Signal (LOS) threshold programmed?

The LOS threshold is set by connecting an external resistor (RTH) between the TH pin and ground. The value of RTH determines the assert and deassert levels.

What is the recommended capacitor value for the offset correction loop in SONET applications?

For ATM/SONET applications using scrambled NRZ data, a capacitor (CAZ) of 0.1μF is recommended between the CAZ1 and CAZ2 pins.