ADF4208BRUZ-R7

Clock Generator 5MHz to 2GHz Input 20Pin TSSOP T/R

Product Details

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

A complete phase-locked loop PLL can be implemented if the synthesizers are used with an external loop filter and voltage controlled oscillators VCOs.

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

**Applications**

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Wireless handsets GSM, PCS, DCS, CDMA, WCDMA

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

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Wireless LANS Communications test equipment

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CATV equipment

### Features and Benefits

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2.0 GHz/1.1 GHz

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2.7 V to 5.5 V power supply

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

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Selectable charge pump currents

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On-chip oscillator circuit

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Selectable dual modulus prescaler

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RF2: 32/33 or 64/65

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RF1: 32/33 or 64/65

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3-wire serial interface

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Power-down mode