The AD8315 is a low-cost subsystem for the precise control of RF power amplifiers operating in the frequency range 0.1 GHz to 2.5 GHz and over a typical dynamic range of 50 dB. It is intended for use in cellular handsets and other battery- operated wireless devices. The log amp technique provides a much wider linear range than conventional control circuits, and has higher DC accuracy and lower power consumption.
The AD8315 is a low‑cost RF detector/controller subsystem designed for precise power‑amplifier control in cellular handsets and other battery‑operated wireless devices. It provides a voltage‑output control signal (VAPC) and a set‑point input (VSET) with a linear‑in‑dB response over a 50 dB dynamic range from 0.1 GHz to 2.5 GHz.
Key specifications include a supply voltage range of 2.7 V to 5.5 V, quiescent current of 8.5 mA (typical) when enabled, and an output voltage swing from 250 mV above ground to within 200 mV of the supply. The device is available in MSOP and LFCSP packages and features low‑power operation with a sleep current of 4 µA.
| Frequency Range | 0.1 GHz to 2.5 GHz |
|---|---|
| Supply Voltage (VPOS) | 2.7 V to 5.5 V |
| Quiescent Current (ENBL high) | 8.5 mA to 10.7 mA |
| Input Resistance (VSET) | 100 kΩ |
The AD8315 operates from 2.7 V up to 5.5 V supply voltage.
When ENBL is high, the quiescent current is typically between 8.5 mA and 10.7 mA.
The VSET input resistance is 100 kΩ.
The device operates from 0.1 GHz to 2.5 GHz.