The M64886FP is a semiconductor integrated circuit designed for RF / IF / AF transceiver function with Dual PLL synthesizer for double conversion system cordless phone which used by 2.4 GHz and 900MHz ISM band of North America. It contains dual PLL and VCO circuit for RX / TX, PA for transmission output, double balance type mixer for the 1st and 2nd intermediate frequency, LIM and RSSI and Demodulator for 5.5 MHz, Expander (include volume control function) / Compressor (include IDC, Splutter Filter block) and Speaker / Microphone Amp for Audio signal. It is possible to control level of TX power by external variable resistor. It is designed using a high-frequency BiCMOS process and contributes to reduce size of system and power consumption.