The AD640 from Analog Devices is a RF Detector with Frequency DC to 120 MHz, Dynamic Range 50 dB, Supply Voltage ±4.5 to ±7.5 V, Operating Temperature -55 to 125 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, DIP, Log Detector. More details for AD640 can be seen below.