HMC424

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Attenuation Value:	31.5dB
Frequency Range:	0Hz ~ 13GHz
Power (Watts):	--
Impedance:	50 Ohms
Package / Case:	Die
Base Part Number:	HMC424

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Introduction to HMC424 Attenuator

The HMC424 is a high-performance monolithic dual-channel attenuator designed for use in a wide variety of applications, ranging from the military to medical and industrial applications. The HMC424 comprises of two input ports, two output ports, and a common enable port, which enables control of the two channels separately. The HMC424 has a control interface consisting of four pins, and each pin can be controlled by either 0-5V analog voltage or logic control. The HMC424 also includes a voltage-limiting circuit that helps prevent damage to the device due to over-voltage.

Application field and Working Principle

The HMC424 attenuator is typically used in receiver architectures with high linearity and low noise figures. It is a single-ended device that can be used either in unbalanced or differential applications. It has excellent return loss to ensure maximum power transfer to the load.The HMC424 attenuator has a differential input and an output impedance of 50 ohms. It has an attenuation range from 0 to 31.5 dB with a flat response, making it well-suited for applications where the signal needs to be attenuated without adversely affecting the source or output.The HMC424 attenuator utilizes a variable and non-linear resistive network to achieve its high levels of linearity. The network consists of two identical resistors and one variable resistor. The variable resistor is used to set the attenuation level. The HMC424 operates by varying the resistance value of the variable resistor in response to the voltage applied to the pins that control it. The resistor values are adjusted such that only the desired frequency range is attenuated.In applications where more than two attenuation levels are required, the HMC424 can be cascaded with other attenuators to achieve a wide range of attenuation steps. The HMC424 is also suitable for applications that require variable gain instead of fixed attenuation. This is done by adjusting the control voltage and changing the ratio of the two constant resistors to the variable resistor.The HMC424 attenuator is also well-suited for AC reference signals, such as the time reference signal in Global Positioning System (GPS), due to its high linearity and low noise figure.Overall, the HMC424 provides a compact and efficient solution for applications that require variable gain or attenuation and is an ideal choice for high-linearity, low-noise applications.

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