MAX3747AEUB

Overview

The MAX3747AEUB+ is a multirate limiting amplifier designed for optical receiver applications. It operates at data rates from 155Mbps to 3.2Gbps and provides over 57dB of gain with less than 10^-12 BER using a 2mVP-P input amplitude. The device features PECL-compatible differential inputs and delivers an 800mV P-P current-mode logic (CML) output. It includes a programmable loss-of-signal detect function and an optional disable feature. The component consumes approximately 18mA supply current excluding output current and is housed in a 10-pin µMAX package.

Feature Summary

• Pin-for-pin compatible with Micrel SY88993V
• Programmable loss-of-signal detection with chatter-free operation
• Optional disable function for implementing squelch
• PECL-compatible differential inputs

Applications

• Gigabit Ethernet SFP/SFF Optical Transceiver Modules
• 1G/2G Fibre-Channel SFP/SFF Optical Transceiver Modules
• Multirate OC-3 to OC-48 FEC SFP/SFF Optical Transceiver Modules
• 10G LX4 Transceiver Modules

Procurement Notes

Verify the specific suffix against the manufacturer's official documentation to confirm lead-free status and temperature range compliance. Ensure the ordering code matches the required functional variant, as different suffixes may indicate distinct electrical characteristics or packaging types. Cross-reference the part number with authorized distributors to confirm current availability and authenticity before procurement.

Selection Notes

Select this component for designs requiring high-gain limiting amplification in small form-factor transceivers. The device supports multirate operation up to 3.2Gbps and offers low power consumption suitable for battery-operated or thermally constrained environments. Consider the MAX3747B variant if enhanced loss-of-signal performance under overload conditions is required for the specific application.

Part Context

This component belongs to the MAX3747 family of low-power SFP limiting amplifiers manufactured by Analog Devices Inc./Maxim Integrated. The series is engineered for use in synchronous optical network (SONET), Fibre-Channel, and Gigabit Ethernet optical receivers. The MAX3747A/MAX3747B variants provide constant-level CML outputs with controlled edge speeds, making them ideal for high-speed digital signal processing in telecommunications equipment.

Replacement Considerations

The MAX3747A/MAX3747B are pin-for-pin compatible with the Micrel SY88993V. Verify that any substitute component maintains identical pinout configuration and electrical specifications to ensure seamless integration without board redesign.

FAQ

What is the difference between the MAX3747A and MAX3747B?

The MAX3747B features enhanced loss-of-signal (LOS) operation under overload conditions compared to the MAX3747A.

How is the loss-of-signal threshold programmed?

The LOS threshold is set by applying a voltage to the TH pin, which is created using a two-resistor divider connected between VCC and VREF.