深圳市华兴微电子有限公司 （非本站正式会员）

Features

• 24-Bit Step Size Resolution, 6 Hz typ
• Ultra Low Phase Noise 
   12 GHz, 50 MHz Ref.
    -98 / -103 dBc/Hz @ 20 kHz 
   (Frac / Integer)
• Auto & Triggered Sweeper Functions
• Cycle Slip Prevention (CSP) 
   for Fast Settling
• Autotune Support for 
   External Step Tuned VCOs
• Multi-VCO Support
• 40 Lead 6x6mm SMT Package: 36mm2

Typical Applications

• Base Stations for Mobile Radio
    (GSM, PCS, DCS, CDMA, WCDMA)
• Wireless LANs, WiMax
• Communications Test Equipment
• CATV Equipment
• FMCW Sensors
• Automotive Radar
• Phased-Array Systems

Functional Diagram

General Description

The HMC702LP6CE is a SiGe BiCMOS fractional-N frequency synthesizer. The synthesizer includes a 8GHz 16-bit RF N-Divider, a 24-bit delta-sigma modulator, a very low noise digital phase frequency detector (PFD), and a precision controlled charge pump. In addition the synthesizer supports an external step tuned VCO.

The fractional synthesizer features an advanced delta-sigma modulator design that allows ultra-fine frequency step sizes. The synthesizer features the ability to alter both the phase-frequency detector (PFD) gain and the cycle slipping characteristics of the PFD. This feature can reduce the time to arrive at the new frequency by 50% vs. conventional PFDs. Ultra low in-close phase noise also allows wider loop bandwidths for faster frequency hopping.

The synthesizer contains a built-in linear sweeper function, which allows it to perform frequency chirps with a wide variety of sweep times, polarities and dwells, all with an external or automatic sweep trigger.

A General Purpose Output (GPO) bus supports the use of multiple VCO s. In addition the synthesizer has a number of auxiliary clock generation modes that can be accessed via the GPO.