MAX5879ZEXF+

Overview

The MAX5879ZEXF+ is a high-performance, 14-bit, 2.3Gsps direct RF synthesis DAC designed for baseband and higher-order Nyquist zone applications. It features four 14-bit multiplexed LVDS input ports with selectable 2:1 or 4:1 mux configurations. The device supports four frequency response modes (NRZ, RZ, RF, RFZ) to optimize dynamic range across Nyquist zones up to the sixth order. Integrated 50Ω differential output matching ensures excellent spurious and intermodulation distortion performance. Operating from 3.3V and 1.8V supplies, it consumes 1.8W at 40mA full-scale current and 2.3W at 80mA. The part operates within an extended temperature range of -40°C to +85°C.

Feature Summary

• Supports four selectable frequency response modes including NRZ, RZ, RF, and RFZ for optimized gain flatness and SNR in multiple Nyquist zones.
• Integrates a delay-locked loop (DLL) for seamless data synchronization with FPGAs or ASICs.
• Features built-in parity input and error identification outputs for bit error detection between source and DAC.
• Includes integrated 50Ω differential output matching resistors to ensure consistent dynamic performance.

Applications

• Synthesizing high-frequency and broadband signals in baseband applications
• Direct RF synthesis for signal bandwidths exceeding 1GHz
• High-order Nyquist zone signal generation up to the sixth Nyquist zone

Procurement Notes

Verify the component authenticity by checking for the 'MAX5879ZEXF+' marking and '+ suffix indicating lead-free/RoHS compliance. Confirm the 256-ball CSBGA package dimensions match the 17mm x 17mm specification. Ensure the supplier provides documentation confirming the extended temperature grade (-40°C to +85°C). Cross-reference the manufacturer's official datasheet for pinout and electrical characteristics to avoid counterfeit parts.

Selection Notes

Select this DAC when requiring 14-bit resolution at speeds up to 2.3Gsps for direct RF synthesis. Choose based on the need for flexible input data rates via the 2:1 or 4:1 multiplexer options. Consider the specific Nyquist zone requirements to determine the appropriate frequency response mode (NRZ, RZ, RF, or RFZ). Ensure system power budgets align with the 1.8W to 2.3W consumption profiles at varying full-scale currents.

Part Context

The MAX5879 belongs to Maxim Integrated's family of high-speed digital-to-analog converters designed for RF and microwave applications. It is specifically engineered for direct RF synthesis, eliminating the need for complex upconversion stages. The ZEXF+ designation indicates a lead-free, RoHS-compliant version in a fine-pitch BGA package suitable for high-density PCB layouts.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing FPGA/ASIC interfaces and clocking schemes before considering alternative devices.