The ADF4156 is a 6 GHz fractional-N frequency synthesizer that implements local oscillators in the upconversion and downconversion. It features an RF bandwidth of up to 6 GHz, programmable fractional modulus, programmable charge pump currents, digital lock detect, etc. It is suitable for applications such as CATV equipment, base stations for mobile radio, wireless handsets, wireless LANs, etc.
The ADF4156 is a 6 GHz fractional‑N frequency synthesizer that operates from a 2.7 V to 3.3 V supply and provides a programmable fractional modulus, charge‑pump currents, and a 3‑wire serial interface. It includes a digital phase‑frequency detector, precision charge pump, and programmable reference divider, allowing flexible output frequencies and phase control. The device is pin‑compatible with several earlier Analog Devices synthesizers and is suited for CATV, mobile base stations, wireless handsets, LANs, and test equipment.
The datasheet lists electrical specifications such as RF input range (0.5‑6 GHz), power‑supply limits, timing parameters, and absolute maximum ratings. Pin configurations for TSSOP and LFCSP packages are provided, along with typical performance graphs for phase noise, lock time, and spur behavior. Thermal impedance, ESD handling, and recommended PCB layout guidelines are also included.
| RF Input Frequency | 0.5 GHz – 6.0 GHz |
|---|---|
| Power Supply Voltage (AVop/DVpp) | 2.7 V to 3.3 V |
| Phase Detector Maximum Frequency | 32 MHz |
| Charge Pump High‑Value Current | 5 mA typ |
| Operating Temperature Range (Industrial B version) | ‑40 °C to +85 °C |
| ESD Rating | <2 kV |
The device operates from 2.7 V to 3.3 V on both the analog (AVop) and digital (DVpp) supplies.
The ADF4156 accepts RF input frequencies from 0.5 GHz up to 6 GHz.
Driving the CE (Chip Enable) pin low powers down the device and places the charge‑pump output in three‑state mode.
The part is rated for electrostatic discharge events of less than 2 kV.