The MAX2015 is a complete multistage logarithmic amplifier designed to accurately convert radio-frequency (RF) signal power in the 0.1GHz to 3GHz frequency range to an equivalent DC voltage. The outstanding dynamic range and precision over temperature of this log amplifier make it particularly useful for a variety of base station and other wireless applications, including automatic gain control (AGC), transmitter power measurements, and received signal strength indication (RSSI) for terminal devices. The MAX2015 can also be operated in a controller mode where it measures, compares, and controls the output power of a variable-gain amplifier as part of a fully integrated AGC loop. This logarithmic amplifier provides much wider measurement range and superior accuracy compared to controllers based on diode detectors, while achieving excellent temperature stability over the full -40°C to +85°C operating range.
The MAX2015 is a multistage logarithmic amplifier designed to convert RF power from 0.1 GHz to 3 GHz into a proportional DC voltage. It offers a 75 dB dynamic range, high accuracy over temperature, and can operate in detector (RSSI) or controller mode for AGC loops.
The device runs from a 2.7 V to 5.25 V supply, supports shutdown current as low as 1 µA, and is specified for –40 °C to +85 °C operation. Pin‑compatible packages include µMAX and TDFN, and the datasheet provides detailed electrical characteristics, layout guidelines, and typical application circuits.
| Frequency range | 0.1 GHz to 3 GHz |
|---|---|
| Dynamic range | 75 dB |
| Shutdown current | 1 µA |
| Output voltage range | 0.5 V to 1.8 V |
| Slope (detector mode) | ~18 mV/dB |
| Operating temperature range | –40 °C to +85 °C |
In shutdown mode the MAX2015 draws about 1 µA of supply current.
The logarithmic detector provides a 75 dB dynamic range over its frequency range.
Driving the PWDN pin high (logic‑high) powers the device down, reducing supply current to the shutdown level.