HMC985-SX

Overview

The HMC985-SX is a GaAs monolithic microwave integrated circuit (MMIC) variable attenuator manufactured by Analog Devices Inc. It operates in the 20 GHz to 50 GHz frequency range with a 50 Ohm impedance. The device provides 35 dB of dynamic attenuation control via an analog DC voltage signal, achieving a maximum attenuation of 40 dB. Key electrical parameters include a typical insertion loss of 4.5 dB and a rated power handling capability of 30 dBm. It requires a -3 V supply voltage and is housed in a die package format.

Feature Summary

• Absorptive variable attenuation design for precise RF signal level control
• Analog DC voltage control mechanism enabling continuous adjustment within the specified dynamic range
• High-frequency operation capability extending up to 50 GHz using GaAs technology

Applications

• Microwave communication systems requiring signal level adjustment
• Test and measurement equipment operating in the Ka-band
• Radar systems utilizing high-frequency signal processing

Procurement Notes

Verify the specific datasheet version for the HMC985-SX variant, as specifications may differ between the 10-40 GHz and 20-50 GHz models. Confirm that the die package format aligns with your assembly capabilities, as it requires specialized mounting. Check current availability status directly with Analog Devices or authorized distributors, as this component may be subject to limited supply conditions or discontinuation notices.

Selection Notes

Select the HMC985-SX when analog control of high-frequency signals is required within the 20-50 GHz band. Ensure the system can accommodate the -3 V supply requirement and the 30 dBm power rating. Consider the 4.5 dB insertion loss impact on overall link budget. Verify compatibility with the 50 Ohm system impedance. Evaluate if the absorptive topology suits the application's reflection coefficient requirements compared to reflective alternatives.

Part Context

The HMC985 series represents Analog Devices' portfolio of high-performance MMIC attenuators designed for microwave applications. These devices utilize GaAs technology to achieve wide bandwidth and precise control. The HMC985-SX specifically targets the higher frequency end of the spectrum, offering robust performance for demanding RF environments where stable attenuation characteristics are critical for system integrity.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult Analog Devices technical support for direct replacements or cross-references based on specific frequency and attenuation requirements.