The ADF4108 frequency synthesizer is a low noise digital phase frequency detector (PFD) and digital phase-locked loop (PLL) that can be used to implement local oscillators in the upconversion and downconversion sections of wireless receivers and transmitters.
The ADF4108 is a PLL frequency synthesizer with an 8 GHz bandwidth, programmable dual‑modulus prescaler, and a 3‑wire serial interface. It is intended for use in broadband wireless access, satellite systems, instrumentation, and wireless LAN base stations. The device includes a low‑noise digital phase‑frequency detector, precision charge pump, programmable reference divider, and A/B counters.
The handbook contains detailed specifications, pin configuration, timing characteristics, absolute maximum ratings, ESD precautions, typical performance data, PCB design guidelines for the 4 mm × 4 mm 20‑lead chip‑scale package, and an ordering guide. It also provides revision history and application notes for integrating the ADF4108 into RF front‑ends.
| RF Input Frequency | 1.0 GHz – 8.0 GHz |
|---|---|
| RF Input Sensitivity | 5 dBm – 45 dBm |
| Maximum Allowable Prescaler | 300 MHz (P=8) |
| Maximum Output Frequency | 325 MHz (P=16) |
| Reference Input Frequency | 20 MHz – 250 MHz |
| Analog Power Supply (AVop) | 3.2 V – 3.6 V |
| Operating Temperature Range (Industrial) | -40 °C to +85 °C |
| Package | 4 mm × 4 mm, 20‑lead chip‑scale package |
The analog power supply (AVop) should be between 3.2 V and 3.6 V.
The industrial version of the ADF4108 operates from –40 °C up to +85 °C.
The device is supplied in a 20‑lead chip‑scale package.