The LT5538 from Analog Devices is a RF Detector with Frequency 40 MHz to 3.8 GHz, Max Input Power -70 to 10 dBm, Supply Voltage 3 to 5.25 V, Current 29 to 36 mA, Operating Temperature -40 to 85 Degree C. Tags: Surface Mount, Power Detector. More details for LT5538 can be seen below.