The AD8319 is a demodulating logarithmic amplifier that accurately converts an RF input signal to a DC output proportional to the input power. The device features a wide bandwidth of 1 MHz to 10 GHz and a dynamic range of 45 dB, making it suitable for RF transmitter PA setpoint control and level monitoring, power monitoring in radiolink transmitters, RSSI measurement in base stations, WLANs, WiMAX, and radars.
The AD8319 is a log detector and controller designed for RF transmitter PA set‑point control, power monitoring, and RSSI measurement in base stations, WLANs, WiMAX and radar systems. It provides a wide 1 MHz‑to‑10 GHz bandwidth, high accuracy (+1 dB over temperature), and a 45 dB dynamic range up to 8 GHz.
Key specifications include a 3.0 V‑5.5 V supply range, 22 mA typical quiescent current, 6 ns fall/10 ns rise time, and a logarithmic slope of –22 mV/dB. The device is offered in a 2 mm × 3 mm 8‑lead LFCSP package and operates from –40 °C to +85 °C.
| Frequency Range | 1 MHz to 10 GHz |
|---|---|
| Dynamic Range | 45 dB up to 8 GHz |
| Supply Voltage | 3.0 V to 5.5 V |
| Quiescent Current | 22 mA typical |
| Input Impedance (at 900 MHz) | 1500 Ω || 0.33 pF |
| Logarithmic Slope | –22 mV/dB |
| Intercept (typical) | 15 dBm |
| Output Voltage (High Power, 10 dBm input) | 0.57 V |
The device operates from 3.0 V to 5.5 V supply voltage.
Typical quiescent current is about 22 mA.
It provides a 45 dB dynamic range up to 8 GHz.
The detector works from 1 MHz to 10 GHz.