Overview

The LC72714W is data demodulator ICs for receiving FM multiplex broadcasts for mobile reception in the DARC format. This IC includes an on-chip bandpass filter for extracting the DARC signal from the FM baseband signal. It also integrates a decoder circuit that performs the VICS data processing on the same chip and can implement a compact, multifunction VICS reception system. The LC72714W is an improved version of the LC72710W that features circuit improvements that allow a single tuner to receive both the VICS data and the dGPS data supported by the earlier device. Note that a contract with VICS Center is required to evaluate this sample IC and to produce end products that support VICS.

Functions

• Adjustment-free 76 kHz SCF bandpass filter

• Built-in VICS decoder

• MSK delay detection system based on a 1T delay.

• Error correction function based on a 2T delay (in the MSK detection stage)

• Digital PLL based clock regeneration function

• Shift-register 1T and 2T delay circuits

• Block and frame synchronization detection circuits

• Functions for setting the number of allowable BIC errors and the number of synchronization protection operations.

• Error correction using (272, 190) codes

• Built-in layer 4 CRC code checking circuit

• On-chip frame memory and memory control circuit for vertical correction

• 7.2 MHz crystal oscillator circuit

• Two power saving modes: STNBY and EC STOP

• Dedicated frame synchronization circuit for simultaneous reception of dGPS and VICS data

• Applications can use either a parallel CPU interface (DMA) or a CCB serial interface.

• Supply voltage: 2.7 to 3.6 V