描述 Description

The ATC79550 allows implementation of fractional-N or integer-N phase-locked loop (PLL) frequency synthesizers if used with an external loop filter and external reference frequency.

The ATC65350 has an integrated voltage controlled oscillator (VCO) with a fundamental output frequency? ranging from 2200 MHz to 4400 MHz. In addition, divide-by-1/2/4/8 or 16 circuits allow the user to generate RF output frequencies as low as 137.5 MHz. For applications that require isolation, the RF output stage can be muted. The mute function is both pin- and software-controllable. An auxiliary RF output is also available, which can? be powered down if not in use.

Control of all? the? on-chip registers is through a simple 3-wire interface. The device operates with a power? supply ranging from 3.0 V to 3.6 V and can be powered down when not in use.

特性 Features

? Output frequency range: 137.5 MHz to 4400 MHz

? Fractional-N synthesizer and integer-N synthesizer

? Low phase noise VCO

? Programmable divide-by-1/-2/-4/-8/- 16 output

? Typical rms jitter:
? Power supply: 3.0 V to 3.6 V

? Logic compatibility: 1.8 V

? Programmable dual-modulus prescaler of 4/5 or 8/9

? Programmable output power level

? RF output mute function

? 3-wire serial interface

? Analog and digital lock detect

? Switched bandwidth fast-lock mode

? Cycle slip reduction

應用 Application

? Wireless infrastructure (W-CDMA,TD-SCDMA, WiMAX, GSM, PCS,DCS, DECT) Test equipment
? Wireless LANs, CATV equipment
? Clock generation