The ADF4252 is a frequency synthesizer from Analog Devices. It is powered by 2.7V to 3.3V and supports 3.0GHz fractional-N/1.2GHz integer-N. It supports 4/5, 8/9, 16/17, 32/33, 64/65 pre-divider ratios, 8/9, 16/17, 32/33, 64/65 programmable charge pump currents, three-wire serial interface, digital lock detect, power-down mode, programmable modulus on fractional-N synthesizer, trade-off noise versus spurious performance
The ADF4252 is a dual fractional‑N/integer‑N frequency synthesizer used as a local oscillator in wireless receivers and transmitters. It supports RF frequencies from 0.25 GHz to 3 GHz and IF frequencies from 0.1 GHz to 1.2 GHz, making it suitable for base‑station, handset, LAN, test equipment and CATV applications.
Key features include a 2.7 V‑3.3 V power supply range, programmable charge‑pump currents, a 3‑wire serial interface for register control, digital lock detect, power‑down mode, and selectable noise versus spurious performance. The device is supplied in a 24‑lead LFCSP package and includes detailed pin‑out and timing specifications.
| RF Input Sensitivity | -10 dBm to 0 dBm |
|---|---|
| IF Input Frequency | 50 MHz – 1.2 GHz |
| Supply Voltage (Vpp1‑Vpp3) | 2.7 V – 3.3 V |
| Power‑Down Current | 1 µA typ |
| Operating Temperature Range | -40 °C to +85 °C |
| Noise Floor (20 MHz PFD) | -141 dBc/Hz typ |
The device operates from 2.7 V to 3.3 V on its Vpp1‑Vpp3 pins.
It is rated for -40 °C to +85 °C (industrial version).
All on‑chip registers are accessed via a simple 3‑wire serial interface.
The power‑down mode draws about 1 µA typical.