The ADF4153A is a fractional-N frequency synthesizer that implements local oscillators in the upconversion and downconversion sections of wireless receivers and transmitters. It consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. A sigma-delta (Σ-Δ) based fractional interpolator allows programmable fractional-N division. The INT, FRAC, and MOD registers define an overall N divider (N = (INT + (FRAC/MOD))). In addition, the 4-bit reference counter (R counter) allows selectable REFIN frequencies at the PFD input. A complete phase-locked loop (PLL) can be implemented if the synthesizer is used with an external loop filter and a voltage controlled oscillator (VCO). A simple 3-wire interface controls all on-chip registers. 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 * CATV equipment * Base stations for mobile radio (GSM, PCS, DCS, WiMAX, SuperCell 3G, CDMA, W-CDMA) * Wireless handsets (GSM, PCS, DCS, CDMA, W-CDMA) * Wireless LANs, PMR * Communications test equipment * RF bandwidth to 4 GHz * 2.7 V to 3.3 V power supply * Separate VP allows extended tuning voltage * Programmable fractional modulus * Programmable charge pump current * 3-wire serial interface * Analog and digital lock detect * Power-down mode * Pin-compatible with ADF4106/ADF4110/ADF4111/ADF4112/ ADF4113 and ADF4153 * Consistent RF output phase * Loop filter design possible with ADIsimPLL https://elecena.pl/product/3746435/fractional-n-frequency-synthesizer 2012-11-08 https://elecena.pl/product/3746435/fractional-n-frequency-synthesizer 2018-03-29 https://elecena.pl/product/3746435/fractional-n-frequency-synthesizer 2025-01-21