HMC8579LG12

Series:	*
Packaging:	Tray
Part Status:	Obsolete
Base Part Number:	HMC857

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Attenuators

The HMC8579LG12 is an attenuator that is used to reduce or moderate the power of an electronic signal. It is a low noise, low power, gain and phase linearity device, which is suitable for use in military and commercial applications. The HMC8579LG12 has three dB increments of attenuation, a dynamic range of 17.5 dB, and a maximum power handling of 3.6 Watts.

Application Field of HMC8579LG12

The HMC8579LG12 is typically used in signal transmission, communication, and high-frequency signal processing systems. It is especially suitable for applications such as radar systems, radio and satellite communications, portable radios, cellular telephones, and wireless local area networks. In these applications, it is used to reduce the power of a signal to prevent communication interference or to match the power of an incoming signal to the power of an outgoing signal.

Working Principle of HMC8579LG12

The working mechanism of the HMC8579LG12 is based on a closed loop in which the output voltage is compared to an internally generated reference voltage. This reference voltage is set according to the requirement and the difference between the two is used to modulate the attenuator. When the output voltage exceeds the reference value, the attenuator reduces the power in proportion to the difference between the two values. The HMC8579LG12 consists of a series of resistors, capacitors, diodes, and transistors arranged in an IC package. Depending on the resistance of the resistor and the speed of the transistor, the device can operate at a maximum frequency of 10GHz. The HMC8579LG12 can be used as an independent or switched attenuator. In addition, the device supports both linear and logarithmic attenuation and has a wide input and output impedance range of 50Ω to 600Ω.

Features of HMC8579LG12

The HMC8579LG12 provides a high level of accuracy of the dB output and features good linearity and Gain Accuracy. It also has a minimized group delay variation and a high thermal stability due to its low-leakage surface mounted ceramic capacitors. In addition, the input and output feature high temperature and humidity performance as well as high ESD tolerance.The device also features a wide operating temperature range from -55°C to +125°C and a supply voltage of 5V. In addition to this, it can be upgraded with the use of a Programmable Attenuator Controller (PAC). This feature enables the device to be programmed to provide an accurate and reliable attenuation level throughout its entire operating range.

Conclusion

The HMC8579LG12 is a low-noise, low-power, gain and phase linearity device with a wide range of applications. It is suitable for use in radar systems, radio and satellite communications, portable radios, cellular telephones, and wireless local area networks. It features low-leakage surface mounted ceramic capacitors, high ESD tolerance, and high thermal stability, and is capable of operating at frequencies up to 10GHz. In addition, it can be upgraded with the use of Programmable Attenuator Controller (PAC) to provide an accurate and reliable attenuation level throughout its entire operating range.

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