Analog Devices Inc.

The ADF4212L is a dual frequency synthesizer that can be usedto implement local oscillators (LO) in the up-conversion and down-conversion sections of wireless receivers and transmitters. It can provide the LO for both the RF and IF sections. It 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 (12-bit) counters, in conjunction with the dual modulus prescaler (P/P + 1), implement an Ndivider (N = BP + A). In addition, the 15-bit reference counter(R Counter), allows selectable REFIN frequencies at the PFDinput. A complete phase-locked loop (PLL) can be implemented if the synthesizer is used with external loop filters and voltage controlled oscillators (VCOs).Control of all the on-chip registers is via a simple 3-wire interface with 1.8 V compatibility. The devices operate with a power supply ranging from 2.7 V to 3.3 V and can be powered down when not in use.Applications Wireless handsets (GSM, PCS, DCS, DSC1800, CDMA, WCDMA) Base stations for wireless Radio (GSM, PCS, DCS, CDMA, WCDMA) Wireless LANS Cable TV tuners (CATV) Communications test equipment

$3.27