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RF Power Detector with Shutdown Control

The MAX2209A power detector is designed to operate from 800MHz to 2.0GHz. The device is ideal for wideband code-division multiple access (WCDMA), cdma2000M, and high-speed downlink/uplink packet access. The MAX2209A accepts an RF signal at the input, and outputs a temperature-independent voltage related to the input signal power. The output voltage expressed in dBV is proportional to the input power expressed in dBm. The device has a detection range from -25dBm to 0dBm.

The typical application circuit, as taken from the MAX2209A EV Kit, is shown in Figure 1. The IC can be shut down by forcing the RFIN/SHDN DC voltage low through a 2kω resistor. The output of the detector goes to an ADC for further processing by the baseband system. Connect a series resistor and shunt capacitor to the MAX2209A output to reduce residual amplitude ripple.

The series resistor should not be less than 1kI.

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RF Power Detector with Shutdown Control