Hot-selling and scarce ADF4208BRUZ Dual RF PLL Frequency Synthesizers TSSOP20 spot stock

Product Descriptions

The ADF420x family of dual frequency synthesizers are usedto implement local oscillators in the upconversion and downconversion sections of wireless receivers and transmitters.Eachsynthesizer consists of a low noise, digital,phase frequency detector(PFD); a precision charge pump;a programmable referencedivider;programmable A and B counters;and a dual modulusprescaler (P/P + 1).The A (6-bit)and B (11-bit) counters,inconjunction with the dual modulus prescaler (P/P + 1),implementan N divider (N =BP +A).In addition,the 14-bit referencecounter (R counter) allows selectable REFIN frequencies at thePFD input.The on-chip oscillator circuitry allows the referenceinput to be derived from crystal oscillators .

A complete phase-locked loop (PLL) can be implemented if thesynthesizers are used with an external loop filter and voltagecontrolled oscillators (VCOs).

Control of all the on-chip registers is via a simple 3-wireinterface . The devices operate with a power supply rangingfrom 2.7 V to 5.5 V and can be powered down when not in use .

Product Features

ADF4206: 550 MHz/550 MHz

ADF4208: 2.0 GHz/1.1 GHz

2.7 V to 5.5 V power supply

Selectable charge pump supply (VP) allows extended

tuning voltage in 3 V systems

Selectable charge pump currents

On-chip oscillator circuit

Selectable dual modulus prescaler

RF2: 32/33 or 64/65

RF1: 32/33 or 64/65

3-wire serial interface

Power-down mode

Product Applications

Wireless handsets (GSM, PCS, DCS, CDMA,WCDMA)

Base stations for wireless radio (GSM, PCS, DCS,

CDMA,WCDMA)

Wireless LANS

Communications test equipment

CATV equipment

Product Specification

Product Photos

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