ADF4112BRU

射频锁相环频率合成器 RF PLL Frequency Synthesizers

GENERAL DESCRIPTION

The ADF4110 familyoffrequency synthesizers can be used to implement localoscillators inthe upconversion and downcon version sectionsofwireless receivers and transmitters. They

consistofalownoise digitalPFDphasefrequencydetector, a precisionchargepump, a programmablereference divider, programmable A and B counters,and a dual-modulus prescaler

P/P + 1.The A 6-bit and B 13-bit counters,in conjunction withthe dual-modulus prescaler P/P + 1,implement an N dividerN = BP+ A.Inaddition,the 14-bitreference counterR counter allows selectable REFIN frequencies atthe PFD input. A completephase-lockedloopPLL can be implemented ifthe synthesizer is used with an external loopfilter and voltage

controlledoscillator VCO.

FEATURES

ADF4110: 550 MHz; ADF4111:1.2 GHz; ADF4112: 3.0 GHz; ADF4113: 4.0 GHz

2.7 V to 5.5 V power supply

Separate charge pump supply VP allows extended tuning voltage in 3V systems

Programmable dual-modulus prescaler 8/9, 16/17, 32/33, 64/65

Programmable charge pump currents

Programmable antibacklash pulse width

3-wire serial interface

Analogand digital lock detect

Hardware and software power-down mode

APPLICATIONS

Base stations for wireless radio GSM, PCS, DCS, CDMA, WCDMA

Wireless handsets GSM, PCS, DCS, CDMA, WCDMA

Wireless LANS

Communications test equipment

CATVequipment