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LR745N3-G Application Field and Working Principle

LR745N3-G is a specialized power management integrated circuit (PMIC) introduced by Linear Technology Corporation. It is designed to be an ultra-low power, dual-channel phase-locked loop (PLL) for cellular base station front-end applications. It combines a high accuracy voltage controlled oscillator (VCO), a frequency synthesizer, fractional-N frequency divider, and a digital phase lock loop circuit fabricated with advanced CMOS technology into a single integrated device.

Features

The LR745N3-G features a programmable frequency synthesizer for generating a wide range of output frequencies from 6.403 MHz - 97.6 kHz, an adjustable reference divider, a PLL core with low power consumption and dynamic power adjustment, a triple PLL loop filter, a watchdog timer, and output amps with rise/fall time control. It also integrates a temperature sensor, power-on reset (POR) circuitry, and a voltage monitor. All these features make the LR745N3-G a versatile and reliable PMIC.

Application Fields

The LR745N3-G has been designed to be used in cellular base station front-end applications where ultra-low power consumption, high accuracy and small-size are essential. Thanks to the PLL circuit and output amps, the LR745N3-G can be used in various applications, such as radio navigation systems, parking systems, airborne communication equipment, satellite communication systems and digital broadcast systems.

Working Principle

The LR745N3-G works by combining a programmable VCO, divider, and a digital PLL circuit into a single integrated device. The VCO generates a wide range of frequencies which can be outputted via a variety of dividers and output amps. The digital PLL circuit is used to synchronize and maintain the frequencies generated by the VCO. The PLL core is operated by a control logic circuit, which provides a closed loop control function and enables the LR745N3-G to accurately maintain a specified output frequency. Moreover, the LR745N3-G offers the ability to dynamically adjust its power consumption over a wide range without the need for a separate power-saving circuitry.

Conclusion

The LR745N3-G power management integrated circuit is a specialized PMIC tailored for cellular base station front-end applications. Its unique features include a programmable frequency synthesizer, adjustable reference divider, PLL core, triple PLL loop filter, and output amps with rise/fall control, all of which make it an ideal choice for ultra-low power, high accuracy applications.

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