The ADF4252 is a dual fractional-N/integer-N frequency synthesizer that can be used to implement local oscillators (LO) in the upconversion and downconversion sections of wireless receivers and transmitters. Both the RF and IF synthesizers consist of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. The RF synthesizer has a Σ-Δ-based fractional interpolator that allows programmable fractional-N division. The IF synthesizer has programmable integer-N counters. A complete phase-locked loop (PLL) can be implemented if the synthesizer is used with an external loop filter and voltage controlled oscillator (VCO). Control of all the on-chip registers is via a simple 3-wire interface. The device operates with a power supply ranging from 2.7 V to 3.3 V and can be powered down when not in use. Applications * Base stations for mobile radio (GSM, PCS, DCS, CDMA, WCDMA) * Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA) * Wireless LANs * Communications test equipment * CATV equipment * 3.0 GHz fractional-N/1.2 GHz integer-N * 2.7 V to 3.3 V power supply * Separate VP allows extended tuning voltage to 5 V * Programmable dual modulus prescaler * RF: 4/5, 8/9 * IF: 8/9, 16/17, 32/33, 64/65 https://elecena.pl/product/192469/dual-fractional-n-integer-n-frequency-synthesizer 2007-02-22 https://elecena.pl/product/192469/dual-fractional-n-integer-n-frequency-synthesizer 2018-03-29 https://elecena.pl/product/192469/dual-fractional-n-integer-n-frequency-synthesizer 2025-01-19