MAX3509EUP

Overview

The MAX3509EUP is a narrow-band medium power amplifier designed for upstream CATV applications. It operates within a frequency range of 5MHz to 65MHz and features programmable gain controlled via a 3-wire digital serial bus in 1dB steps. The device outputs up to 67dBmV (QPSK) through a 1:1 transformer with ultra-low power-up/down transients of 25mV typical at maximum output. It supports single-supply operation, offers an output level range from less than 12dBmV to 67dBmV, and maintains a low transmit output noise floor of -41dBmV.

Feature Summary

• Programmable gain control accessible through a 3-wire digital serial interface
• Ultra-low transient response during power-up and power-down cycles
• Integrated 1:1 output transformer for signal coupling
• Low noise performance in both active and transmit-disable states

Applications

• Telephony-Over-Cable systems
• CATV Set-Top Boxes
• CATV Infrastructure equipment
• Cable Modems

Procurement Notes

Verify the specific package type and temperature rating against the official datasheet before procurement. Confirm RoHS compliance status as indicated by the suffix. Check current availability and lifecycle status, as this component may be subject to discontinuation or supply constraints. Ensure the serial bus interface requirements match the system controller capabilities.

Selection Notes

Select this component for upstream cable applications requiring precise gain adjustment and low noise characteristics. Consider the 5MHz to 65MHz operating bandwidth and single-supply voltage requirements. Evaluate the need for the integrated transformer and serial control interface against alternative discrete solutions. Verify thermal management needs for the TSSOP-20 package in the target enclosure.

Part Context

The MAX3509 series consists of programmable power amplifiers specifically engineered for cable television upstream channels. The EUP variant denotes a specific temperature grade and surface-mount packaging configuration within the Maxim Integrated product line. This family addresses the demand for compact, high-performance amplification in hybrid fiber-coaxial networks.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.