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