Overview
The LC72705E is a data demodulation IC for receiving FM multiplex broadcasts for mobile receivers in the DARC format. This IC includes a decoder circuit that performs the required VICS processing, and, in conjunction with a bandpass filter IC (either the LV3400M or the LV3403M), can form a compact yet high-functionality VICS reception system. Note that a contract with VICS Center is required to evaluate this IC and to produce end products that support VICS.

Functions
• MSK delay detection circuit based on a 1T delay
• Error correction function based on a 2T delay (in the MSK detector stage)
• Digital PLL based Clock regeneration circuit
• Shift-register type 1T and 2T delay circuits
• Block and frame synchronization detection circuit
• Function for setting the number of allowable BIC errors, the number of synchronization protection states
• Error correction using (272, 190) codes
• Layer 4 CRC code checking circuit
• On-chip frame memory and memory control circuit for vertical correction
• 7.2-MHz crystal oscillator circuit
• VICS decoder circuit

Applications
• Receivers for DARC format mobile receiver FM multiplex broadcasts