HMC655-SX

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Attenuators are devices used to lower the amplitude of acoustic, electrical, or optical signals. An attenuator is used to adjust the signal strength in order to reduce interference, prevent overload, or modify the signal levels for proper interfacing. The HMC655-SX is a high performance solid state high power programmable attenuator used to precisely adjust the signal levels in a wide range of applications. It is capable of controlling the amplitude of RF signals from DC to 5 GHz, and is designed to provide high isolation levels and fast switching times.

Application Field

The HMC655-SX is used in a variety of applications including testing and measurement equipment, communications systems, automated test systems, synthetic instruments, communications and telemetry systems, military and aerospace instrumentation, video systems, microwave radio systems, and any RF system that requires precise signal level control. It is designed to operate with 0.15 dB accuracy over its entire frequency range, making it ideal for measurement and testing applications.

The HMC655-SX is also designed for use in automated test and measurement systems. The attenuator can be programmed for specific attenuation values and the control system can adjust the attenuator settings. This allows quick switching between different calibration points, ideal for automated testing. This feature also makes the HMC655-SX effective for 3G and 4G cellular base station testing.

Working Principle

The HMC655-SX is a solid state programmable attenuator that utilizes PIN diodes to control the amount of power attenuated. The PIN diode control circuit is optimized for linear performance and fast switching, allowing for accurate and speedy signal level control. The PIN diodes are connected in a bridge circuit and are arranged in 8 columns and 8 rows. The attenuator can be programmed to select the desired attenuation level using the external digital control pins.

The HMC655-SX also has an integrated variable resistance that allows the attenuator to trim its linearity over its full frequency range. The linearity can be adjusted for different temperatures and operating conditions. An internal temperature sensor is also included for further optimization.

The HMC655-SX has a high level of isolation that ensures that the signal present at the input does not appear at the output. This is important for ensuring signal integrity and avoiding interfering signals.

The HMC655-SX has an output power rating of up to 2 watts, making it suitable for a wide range of applications. The device is manufactured in a 3.3mm, 16-lead LFCSP package, making it suitable for any application with limited space constraints.

The HMC655-SX is a highly versatile programmable attenuator capable of adjusting signal levels with 0.15 dB accuracy. It is suitable for both test and measurement applications and for use in automated systems. The low profile package and high power rating make it ideal for use in a variety of applications.

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