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AK1541 Datasheet(PDF) 1 Page - Asahi Kasei Microsystems |
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AK1541 Datasheet(HTML) 1 Page - Asahi Kasei Microsystems |
1 / 36 page [AK1541] MS1043-E-05 1 2013/03 AK1541 20 to 600MHz Delta-Sigma Fractional-N Frequency Synthesizer 1. Overview The AK1541 is a Delta-Sigma Fractional-N PLL (Phase Locked Loop) frequency synthesizer with a frequency switching function, covering a wide range of frequencies from 20 to 600MHz. This product consists of an 18-bit Delta-Sigma modulator, a low-noise phase frequency comparator, a highly accurate charge pump, a reference divider and a dual-module prescaler (P/P+1). An excellent PLL can be achieved by combining this synthesizer with the external loop filter and VCO (Voltage Controlled Oscillator). The access to the registers is controlled via a three-lines serial interface. The operating supply voltage is from 2.7 to 5.5V; and the charge pump and serial interface can be driven by individual supply voltages. 2. Features Delta-Sigma Fractional-N frequency synthesizer providing shorter lockup time, lower phase noise and low spurious performance Operating frequency: 20 to 600MHz On-chip charge pump for fast lockup Programmable charge pump current: In a normal operating scheme, the charge pump current can be set in 16 steps, in the range from 10.6 to 168.9uA. In a fast lockup scheme, the charge pump current can be set in 8 steps, in the range from 0.84 to 2.32mA. Supply Voltage: 2.7 to 5.5 V (PVDD and CPVDD pins) Separate power supply for the charge pump: PVDD to 5.5V (CPVDD pin) On-chip power-saving features On-chip PLL lock detect feature: Direct output to the PFD (Phase Frequency Detector) or digital filtering output can be selected. Very low consumption current: 3.4mA typ. (excluding a charge pump current) Package: 24pin QFN (0.5mm pitch, 4mm 4mm 0.7mm) Operating temperature: -40C° to 85C° |
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