The AD8313 is a complete multistage demodulating logarithmic amplifier, capable of operating in a wide bandwidth range of 0.1 GHz to 2.5 GHz. It features high dynamic range, high accuracy, fast response, and is suitable for applications such as RF transmitter power amplifier setpoint control and level monitoring, RSSI measurement, cellular base stations, radio links, and radar.
The AD8313 is a multistage logarithmic amplifier designed for RF measurement and power amplifier control applications up to 2.5 GHz. It provides a high dynamic range of 70 dB, fast response (40 ns), and operates from a single supply of 2.7 V to 5.5 V.
The device includes eight 8 dB amplifier stages and nine detector cells, delivering a rail‑to‑rail output voltage. It offers both logarithmic (RSSI) and controller modes, with a typical slope of 18 mV/dB and an intercept near –100 dBm. An evaluation board and multiple packaging options are available.
| Frequency Range | 0.1 GHz – 2.5 GHz |
|---|---|
| Supply Voltage Range | +2.7 V to +5.5 V |
| Power Consumption (typical) | 40 mW at 3 V |
| Dynamic Range (3 dB) | 70 dB |
| Slope (log amp mode) | 18 mV/dB (typical) |
| Intercept (log amp mode) | -100 dBm (typical) |
| Output Source Current | 400 µA |
| Output Sink Current | 10 mA |
| Operating Temperature Range | -40 °C to +85 °C |
The AD8313 operates from a single supply between +2.7 V and +5.5 V.
The device has a fast full‑scale response of about 40 ns.
It provides a high dynamic range of up to 70 dB.
Typical power consumption is 40 mW when powered at 3 V.