MAX3658AETA+T

Overview

The MAX3658AETA+T is a transimpedance preamplifier designed for optical receivers operating up to 622Mbps. It features 45nA RMS input-referred noise, 18.3kΩ small-signal transimpedance gain, and 580MHz bandwidth. The device operates from a +3.3V supply with 66mW power dissipation. It includes an integrated filter resistor for photodiode biasing and an average photocurrent monitor. The package is an 8-pin TDFN (3mm x 3mm) with an exposed pad.

Feature Summary

• Integrated DC cancellation circuit minimizes pulse-width distortion for data sequences with 50% mark density
• Built-in photocurrent monitor provides current output proportional to the average input signal
• Internal resistive network at the FILT pin enables simple external filtering for supply noise reduction

Applications

• Optical receivers operating up to 622Mbps
• Passive Optical Networks (PON)
• Small Form-factor Pluggable (SFF/SFP) Transceivers
• FTTx Transceivers

Procurement Notes

Verify the component matches the exact part number MAX3658AETA+T. Confirm the manufacturer is Analog Devices Inc./Maxim Integrated. Ensure the package type is 8-lead TDFN (3mm x 3mm). Check that the temperature range is -40°C to +85°C. Validate RoHS compliance status through official documentation.

Selection Notes

Select this component for applications requiring low noise and high gain in fiber optic receivers. Consider the 580MHz bandwidth and 45nA noise figure for sensitivity requirements. Evaluate the need for the integrated photocurrent monitor and DC cancellation features. Ensure the system can accommodate the 3.3V supply voltage and differential output termination.

Part Context

The MAX3658 series consists of low-noise, high-gain transimpedance preamplifiers optimized for 622Mbps fiber optic applications. The MAX3658A variant offers positive output polarity, while the MAX3658B provides negative polarity. Both are available as dice or in the 8-pin TDFN package.

Replacement Considerations

Public confirmed substitute part numbers include MAX3658AETA-T and MAX3658BE/D.

FAQ

How does the MAX3658 handle DC components in the input signal?

The device incorporates an internally compensated DC cancellation circuit that uses low-frequency feedback to remove the DC component, centering the signal within the linear range.

What is the function of the FILT pin?

The FILT pin connects to an internal on-chip resistive network used to bias the photodiode cathode. An external capacitor connected here forms a filter to reduce supply noise effects.