ADF41513 26.5 GHz, Integer N/Fractional-N, PLL Synthesizer

优势和特点

• 1 GHz to 26.5 GHz bandwidth
• Ultralow noise PLL
• Integer N: −234 dBc/Hz, fractional-N: −231 dBc/Hz
• High maximum PFD frequency
• Integer N: 250 MHz, fractional-N: 125 MHz
• 25-bit fixed/49-bit variable fractional modulus
• Single-ended reference input
• 3.3 V power supply, 3.3 V charge pump
• Integrated 1.8 V logic capability
• Phase resync
• Programmable charge pump currents: 16× range
• Digital lock detect
• 3-wire serial interface with register readback option
• Hardware and software power-down mode

产品详情

The ADF41513 is an ultralow noise frequency synthesizer that can be used to implement local oscillators (LOs) as high as 26.5 GHz in the upconversion and downconversion sections of wireless receivers and transmitters.

The ADF41513 is designed on a high performance silicon geranium (SiGe), bipolar complementary metal-oxide semiconductor (BiCMOS) process, achieving a normalized phase noise floor of −234 dBc/Hz. The phase frequency detector (PFD) operates up to 250 MHz (integer N mode)/ 125 MHz (fractional-N mode) for improved phase noise and spur performance. The variable modulus Δ-Σ modulator allows extremely fine resolution when using a 49 bit divide value. The ADF41513 can be used as either an integer N phase-locked loop (PLL) or fractional-N PLL with either a fixed modulus for subhertz frequency resolution, or variable modulus for subhertz exact frequency resolution.

A complete PLL is implemented when the synthesizer is used with an external loop filter and voltage controlled oscillator (VCO). The 26.5 GHz bandwidth means a frequency doubler or divider stage can be eliminated, simplifying system architecture and reducing cost. The ADF41513 is packaged in a compact, 24-lead, 4 mm × 4 mm LFCSP.

Applications

• Test equipment and instrumentation
• Wireless infrastructure
• Microwave point to point and multipoint radios
• VSAT radios

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