深圳市华兴微电子有限公司 （非本站正式会员）

Features

• 8 GHz, 16 bit prescaler
• Fractional or Integer Modes
• 24 bit step size resolution, 3 Hz typ
• Ultra Low Phase Noise
   6 GHz; 50 MHz Ref.
   -103 / -108 dBc/Hz @ 20 kHz 
   (Frac/INT)
   Figure of Merit (FOM)
   -221/-227 dBc/Hz (Frac/INT)
• 225 MHz, 14bit reference path input
• Direct FSK Modulation Mode
• Cycle Slip Prevention
• Read / Write Serial Port, Chip ID
• 24 Lead 4x4mm SMT Package: 16mm2

Typical Applications

• Base Stations for Mobile Radio
• WiMAX
• Test & Measurement
• CATV Equipment
• Phased Array Applications
• Simple FSK Links
• DDS Replacement

Functional Diagram

General Description

The HMC700LP4(E) is a SiGe BiCMOS fractional-N frequency synthesizer. The synthesizer includes a very low noise digital phase frequency detector (PFD), and a precision controlled charge pump.

The fractional synthesizer features an advanced deltasigma modulator design that allows both ultra-fine step sizes and very low spurious products. Spurious outputs are low enough to eliminate the need for costly Direct Digital Synthesis (DDS) references in many applications.

The HMC700LP4(E) phase-frequency detector (PFD) features cycle slip prevention (CSP) technology that allows faster frequency hopping times.

Ultra low in-close phase noise and low spurious also permit architectures with wider loop bandwidths for faster frequency hopping and low micro-phonics. FSK mode allows the synthesizer to be used as a simple low cost direct FM transmitter source.