ADF4252

PRODUCTION

Dual Fractional-N/ Integer-N Frequency Synthesizer

Analog Devices ADF4252 Product Info

10 February 2026 6

Features

3.0 GHz fractional-N/1.2 GHz integer-N
2.7 V to 3.3 V power supply
Separate V_P 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

Programmable charge pump currents
3-wire serial interface
Digital lock detect
Power-down mode
Programmable modulus on fractional-N synthesizer
Trade off noise vs. spurious performance

Part details & applications

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

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