The ADF4157 is a 6 GHz fractional-N frequency synthesizer with a 25-bit fixed modulus, allowing subhertz frequency resolution at 6 GHz. It features a wide RF bandwidth, programmable charge pump currents, and is suitable for applications such as satellite communications terminals, radar equipment, instrumentation equipment, and personal mobile radio (PMR).
The ADF4157 is a 6 GHz fractional‑N frequency synthesizer with a 25‑bit fixed modulus, enabling sub‑hertz resolution. It includes a low‑noise digital phase‑frequency detector, programmable charge pump, and a 3‑wire serial interface, operating from a 2.7 V to 3.3 V supply and supporting power‑down mode.
The document lists detailed specifications, timing diagrams, pin descriptions, thermal data, and typical performance curves, and it outlines applications such as satellite communications, radar, mobile radios, and wireless handsets.
| RF Input Frequency | 0.5 GHz – 6.0 GHz |
|---|---|
| Supply Voltage (AVpp/DVpp) | 2.7 V to 3.3 V |
| Reference Input Frequency | 10 MHz – 300 MHz |
| Phase Detector Frequency | up to 32 MHz |
| Charge Pump High Current | 5 mA (typical) |
| Input High Voltage (Vin) | ≥ 14 V |
| Operating Temperature (Industrial B version) | –40 °C to +85 °C |
The device operates from 2.7 V to 3.3 V.
A simple 3‑wire serial interface is used for register programming.
The ADF4157 supports RF input frequencies up to 6 GHz.
The industrial version operates from –40 °C to +85 °C.