SA639DH,512

Series:	SA639
Packaging:	Tube
Part Status:	Obsolete
RF Type:	Cellular, ASK, DECT, FSK, UHF, VHF
Frequency:	500MHz
Number of Mixers:	2
Gain:	9.2dB
Noise Figure:	11dB
Secondary Attributes:	Up Converter
Current - Supply:	10mA
Voltage - Supply:	2.7 V ~ 5.5 V
Package / Case:	24-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	24-TSSOP

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RF Mixers

A RF mixer, or a radio frequency mixer, is an electronic or radio frequency device used to convert signals from one frequency to another. In communication systems, a RF mixer is used to convert a signal from one band to another so that it can be routed through multiple channels. This helps to ensure that the same signal can be received by multiple receivers over a variety of frequencies. The SA639DH,512 is an example of a RF mixer and this article will examine its application fields and working principles.

Applications

The SA639DH,512 is a high-performance superhet double-balanced mixer primarily used for radio frequency applications. It is a low-noise device that is designed to effectively convert signals from a low frequency to a high frequency. This makes it an ideal choice for transceiver, transponder, and source-independent band conversion. It is also used in FM and message transmission systems. Due to its low power consumption, the device is well-suited for use in low-power and portable applications.

Working Principles

The SA639DH,512 consists of two identical twin-balanced circuits connected in parallel. It is a double-balanced mixer, which means that two balanced oscillators are connected to the same point. Each oscillator will generate an output signal with a specified frequency, and the signals will interfere with each other. This interference produces a signal with an average frequency that is equal to the sum of the original frequencies. This is known as the "heterodyne effect". The heterodyne signal is then outputted at the output port of the RF mixer.The SA639DH, 512 also has a bypass option which allows it to switch between the two different signal types. The bypass option is selected when an input signal needs to be switched without any frequency conversion. This allows the device to be used as a simple switch.

Conclusion

The SA639DH,512 is a high-performance double-balanced mixer that is suitable for a variety of radio frequency applications. It is capable of converting signals from a low frequency to a high frequency, making it ideal for transceivers and other source-independent band conversion. Additionally, the device features a bypass option for simple switching applications. This makes the SA639DH,512 a versatile and reliable device for a wide variety of radio frequency applications.

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