ADF4208BRUZ-RL

锁相环 - PLL Dual Integer-N 1.1 GHz/2.0 GHz

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