Analog Devices Inc. ADF4218LBRUZ

Description
The ADF4217L/ADF4218L/ADF4219L are lowpower dualfrequency synthesizers designed for use in local oscillators in wireless receivers and transmitters. They consist of a digital PFD, charge pump, programmable reference divider, A and B counters, and a dual modulus prescaler. The A and B counters, along with the dual modulus prescaler, implement an N divider (N = BP A). The 14bit reference counter allows for selectable REFIN frequencies at the PFD input. A complete PLL can be implemented when used with an external loop filter and VCOs. Control of the onchip registers is via a 3wire interface with 1.8 V compatibility. The devices operate with a power supply ranging from 2.6 V to 3.3 V and can be powered down when not in use.

Features
Total loop bandwidth: 7.1 MHz
Bandwidth/RF: 3.0 GHz (ADF4217L/ADF4218L), 1.1 GHz (ADF4219L)
Bandwidth/IF: 1.0 GHz (ADF4219L)
2.6 V to 3.3 V power supply
1.8 V logic compatibility
Separate Vp allows extended tuning voltage
Selectable dual modulus prescaler
Selectable charge pump currents
Charge pump current matching of 1%
3wire serial interface
Powerdown mode

Applications
Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
Base stations for wireless radio (GSM, PCS, DCS, WCDMA)
Wireless LANs
Communications test equipment
Cable TV tuners (CATV)