ACT5805AQI-T

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Part Status:	Obsolete
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IntroductionThe ACT5805AQI-T is a specialized power management integrated circuit (PMIC) designed by Analog Devices, Inc. This device is a high performance, low noise, and low quiescent current fractional-N synthesizer that operates at up to 3.2 GHz. It is designed for cell phone and other cellular communication systems and is capable of generating very low-noise and low-power signal chains. The device has two distinct modes of operation, one for traditional fractional-N synthesis and the other for active fractional-N synthesis.Application Field of ACT5805AQI-TThe ACT5805AQI-T is primarily designed as a fractional-N synthesizer for cellular communication systems. This device is capable of operating at up to 3.2 GHz, making it an ideal choice for cell phone and other cellular communication systems. It is also suited for wireless local area network (WLAN) and global positioning system (GPS) applications, as well as for stand-alone radio frequency (RF) source applications. Additionally, the device is also useful for radio data communication systems, frequency hopping systems, and other high frequency applications.Working Principle of ACT5805AQI-TThe ACT5805AQI-T operates using two independent levels of fractional-N synthesis. The first level uses a traditional analog loop-and-memory architecture, while the second leverages a digital modulation technique to actively manipulate the loop’s noise characteristics. At the heart of the device is a high performance multiplier-accumulator (MAC). This MAC is used to generate the required mixer signals and loop control signals. The ACT5805AQI-T also uses an integrated, low-level current integrator to maintain noise immunity, as well as an integrated delta-sigma ADC to perform digital loop control.In operation, the device first uses the traditional fractional-N synthesis architecture to generate the required mixer signals. These mixer signals are then passed through the low-level current integrator, which manages loop noise levels. The integrated delta-sigma ADC is then used to monitor the generated signals and adjust the loop feedback parameters. Finally, the actively modulated noise characteristics are fed back into the loop, resulting in the required output frequency and stability.ConclusionThe ACT5805AQI-T is a high performance, low noise, and low quiescent current fractional-N synthesizer designed by Analog Devices, Inc. It is designed for cellular communication systems and is capable of generating extremely low-noise and low-power signal chains. The device employs two levels of fractional-N synthesis in order to provide the maximum level of performance, with the first leveraging a traditional analog loop-and-memory architecture, and the second using a digital modulation technique to actively manipulate the loop’s noise characteristics. With its wide range of features, the ACT5805AQI-T proves to be an ideal choice for cellular communication systems, WLANs, GPS applications, and other high frequency applications.

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