The CXA3685ER is an IC developed for direct orthogonal detection of L band (1 to 2GHz) IF signals in a digital satellite broadcast reception tuner. This direct conversion (Zero-IF) technology eliminates the need for the SAW filter that was formerly necessary. In addition, the CXA3685ER incorporates an RF gain control amplifier, oscillator circuit, wide-band phase shifter circuit and other RF circuits, a baseband LPF, baseband gain control amplifier, tuning PLL, and the inductor and varactor diode needed for a tuning VCO. This makes it possible to realize the front-end RF block without tuning the RF circuits. (Applications: BS/CS digital broadcast (ISDB-S) tuner)