MAX3761EEP

Overview

The MAX3761EEP+ is a low-power, single-channel limiting amplifier designed for 622Mbps LAN and ATM fiber optic applications. It operates on a single +5V supply with a maximum voltage of 5.5V and minimum of 4.5V. The device features 60dB voltage gain, 25mA operating current, and 591mW power dissipation. It provides PECL data outputs and TTL LOS interface logic in a 20-pin QSOP package. Operating temperature ranges from -40°C to +85°C.

Feature Summary

• Chatter-free power detector with programmable loss-of-signal outputs
• 4mV input sensitivity for low-level signal detection
• PECL data outputs with controlled edge speeds
• TTL-compatible loss-of-signal interface logic

Applications

• 622Mbps LAN/ATM LAN Receivers
• 155Mbps LAN/ATM LAN Receivers
• Fiber optic receiver systems requiring RSSI indication
• Optical networks utilizing squelch functions

Procurement Notes

Verify the specific suffix against official manufacturer documentation to confirm lead-free status and RoHS compliance. Confirm the exact package type and pin configuration match the design requirements before integration. Check for any recent product discontinuance notices or lifecycle changes directly from the manufacturer.

Selection Notes

Select this component for applications requiring high sensitivity and integrated signal strength monitoring. Ensure the system supports PECL output termination and TTL logic levels for control signals. Verify that the single +5V supply constraint aligns with the overall system power architecture and thermal management capabilities.

Part Context

This part belongs to the MAX3761/MAX3762 family of limiting amplifiers manufactured by Analog Devices / Maxim Integrated. It is specifically optimized for low-cost, high-speed fiber optic receivers. The MAX3761 variant distinguishes itself with TTL LOS outputs, whereas the MAX3762 uses PECL LOS outputs.

Replacement Considerations

Consult official manufacturer documentation for confirmed substitute part numbers. Do not assume compatibility with other series members without verifying electrical characteristics and pin configurations.

FAQ

How is the Loss-of-Signal threshold programmed?

The LOS threshold is programmed using two external resistors connected to the VTH pin. The relationship is defined as VTH = 1.18(1 + R2 / R1), where R1 must be greater than or equal to 100kΩ.

What is the purpose of the FILTER capacitor?

The FILTER capacitor sets the integration frequency of the power detector. For 622Mbps ATM applications, a value of 100pF is recommended to achieve an integration frequency of approximately 3MHz.