The LTC6412 is a fully differential variable gain amplifier with linear-in-dB analog gain control. It is designed for AC-coupled operation in IF receiver chains from 1MHz to 500MHz. The part has a constant OIP3 across a wide output amplitude range and across the 31dB gain control range. The output noise (NF + Gain) is also fl at versus gain to provide a uniform spurious-free dynamic range (SFDR) >120dB over the full gain control range at 240MHz.The LTC6412 is ideal for interfacing with the LT5527 and LT5557 downconverting mixers, LTC6410-6 IF amplifier and the LTC6400/LTC6401/LTC6416 ADC drivers for use in 12-, 14-, and 16-bit ADC applications.The LTC6412 recovers quickly from an overdrive condition, and theENpin allows for a fast output signal disable to protect sensitive downstream components. Asserting theSHDNpin reduces the current consumption below 1mA for power-down or sleep modes.ApplicationsIF Signal Chain Automatic Gain Control (AGC)2.5G and 3G Cellular Basestation TransceiversWiMAX, WiBro, WLAN ReceiversSatellite and GPS Receiver IF