MAX3518ETP+C33

Overview

The MAX3518ETP+C33 is an integrated CATV upstream amplifier IC designed for DOCSIS 3.0 compliance, manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +5V supply and features a 20-pin, 5mm x 5mm thin QFN package. The device supports a 5MHz to 85MHz input frequency range with a 3dB bandwidth of 275MHz. It handles four simultaneous QPSK modulated carriers at +58dBmV each. Gain is controlled via a 3-wire SPI interface across a 63dB range with 1dB steps. Power consumption is 1.25W at 31dB gain and 64dBmV output, dropping to 25mW in transmit disable mode.

Feature Summary

• Integrated design supporting DOCSIS 3.0 requirements with differential inputs and outputs
• SPI-controlled gain adjustment allowing precise configuration for system needs
• Multiple power modes enabling optimization between performance and current consumption
• Low transient voltage during burst enable/disable operations

Applications

• DOCSIS 3.0 cable modems
• Set-top boxes
• VoIP modems

Procurement Notes

Verify the specific suffix C33 against official documentation to confirm tape-and-reel packaging or temperature grade variations. Ensure compatibility with existing board layouts regarding the 20-WQFN footprint. Confirm that the manufacturer designation reflects the post-acquisition status under Analog Devices. Cross-reference pinouts to ensure alignment with reference designs.

Selection Notes

Select this component for applications requiring low-power upstream amplification in hybrid fiber-coaxial networks. Evaluate the trade-off between the 1.25W active power and the 25mW standby mode based on thermal constraints. Consider the requirement for an external balun for single-ended connections. Verify that the 3.3V CMOS logic levels match the host controller interface.

Part Context

Originally developed by Maxim Integrated, this part is now part of the Analog Devices portfolio following the 2021 acquisition. The MAX3518 series addresses the growing demand for efficient upstream signal processing in broadband infrastructure. It represents a shift toward highly integrated solutions that reduce external component count while maintaining high linearity and low noise figures essential for modern data-over-cable services.

Replacement Considerations

Check for direct cross-references within the Analog Devices catalog. Verify if older Maxim-branded versions are still available through authorized distributors. Ensure any substitute maintains the same 20-pin QFN package and electrical specifications.