The AD8318 is a wideband, high-accuracy, low-noise RF power detector that provides power monitoring and power control functions.
The AD8318 from Analog Devices is a wide‑band logarithmic detector/controller covering 1 MHz to 8 GHz. It offers high accuracy (+1 dB over a 55 dB range), low noise, and a built‑in temperature sensor for stable operation across –40 °C to +85 °C. The device can operate from a single 5 V supply, drawing about 68 mA in active mode and less than 1.5 mW when powered down.
The datasheet provides detailed specifications, pin configurations, typical performance curves, and guidance for both measurement and controller modes. It also includes an evaluation board layout, ordering information, and absolute maximum ratings for safe design integration.
| Frequency range | 1 MHz to 8 GHz |
|---|---|
| Quiescent current (ENBL=5 V) | 68 mA typical |
| Output voltage range (VOUT) | 0 V to 4.9 V |
| Operating temperature range | -40 °C to +85 °C |
| Logarithmic slope | ≈ –25 mV/dB |
| Power‑down consumption | < 1.5 mW at 5 V |
| Response time | 10 ns fall, 12 ns rise |
In power‑down the AD8318 consumes less than 1.5 mW at a 5 V supply.
The detector has a pulse response time of 10 ns fall and 12 ns rise.
VOUT can swing from 0 V up to 4.9 V, suitable for controller applications.