MAX3509EUP+

Overview

The MAX3509EUP+ is a programmable power amplifier designed for CATV upstream applications, operating within a frequency range of 5 MHz to 65 MHz. It delivers an output level ranging from less than 12 dBmV to 67 dBmV (QPSK) through a 1:1 transformer. The device features variable gain controlled via a 3-wire digital serial bus with 1 dB step resolution. Key electrical characteristics include ultra-low power-up/down transients of 25 mV typical at 66 dBmV output and a low transmit output noise floor of -41 dBmV in a 160 kHz bandwidth. It supports single-supply operation and includes a shutdown mode.

Feature Summary

• Programmable gain control accessible through a 3-wire digital serial interface
• Ultra-low transient response during power-up and power-down cycles
• Low transmit output noise floor ensuring signal integrity
• Integrated shutdown mode for power management

Applications

• Telephony-Over-Cable systems
• CATV Set-Top Boxes
• Cable Modems
• CATV Infrastructures

Procurement Notes

Verify the specific suffix EUP+ against the manufacturer's current datasheet to confirm package type and RoHS compliance status. Confirm availability as this component may be subject to supply constraints or discontinuation notices. Ensure the design environment supports the required 3-wire serial communication protocol for gain adjustment.

Selection Notes

Select this component for upstream cable television applications requiring precise gain programming and low noise performance. The device is suitable for designs needing single-supply operation and minimal transient disturbances. Evaluate the need for the specific 5 MHz to 65 MHz frequency coverage and the integration of the internal 1:1 transformer.

Part Context

The MAX3509 belongs to Maxim Integrated's lineup of upstream CATV amplifiers. It is engineered to meet the stringent requirements of hybrid fiber-coaxial networks. The part integrates necessary amplification and control functions into a compact surface-mount package, facilitating efficient PCB layout for cable modem and set-top box implementations.

Replacement Considerations

The MAX3507 is a documented alternative within the same family, featuring an on-chip anti-alias filter. Verify pin compatibility and functional equivalence before substitution.