CMOS LSI

Ordering number : EN *5602

N2897HA (OT) No. 5602-1/14

Preliminary

LC72720, 72720M

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

Overview

The LC72720 and LC72720M are single-chip system LSIs

that implement the signal processing required by the

European Broadcasting Union RDS (Radio Data System)

standard and by the US NRSC (National Radio System

Committee) RDBS (Radio Broadcast Data System)

standard. These LSIs include band-pass filter,

demodulator, synchronization, and error correction circuits

as well as data buffer RAM on chip and perform effective

error correction using a soft-decision error correction

technique.

Functions

• Band-pass filter: Switched capacitor filter (SCF)

• Demodulator: RDS data clock regeneration and

demodulated data reliability information

• Synchronization: Block synchronization detection (with

variable backward and forward protection conditions)

• Error correction: Soft-decision/hard-decision error

correction

• Buffer RAM: Adequate for 24 blocks of data (about 500

ms) and flag memory

• Data I/O: CCB interface (power on reset)

Features

• Error correction capability improved by soft-decision

error correction

• The load on the control microprocessor can be reduced

by storing decoded data in the on-chip data buffer RAM.

• Two synchronization detection circuits provide

continuous and stable detection of the synchronization

timing.

• Data can be read out starting with the backward-

protection block data after a synchronization reset.

• Fully adjustment free

• Operating power-supply voltage: 4.5 to 5.5 V

• Operating temperature: –40 to +85°C

• Package: DIP24S, MFP24

Package Dimensions

unit: mm

3067-DIP24S

unit: mm

3045B-MFP24

SANYO: DIP24S

[LC72720]

SANYO: MFP24

[LC72720M]

• CCB is a trademark of SANYO ELECTRIC CO., LTD.

• CCB is SANYO’s original bus format and all the bus

addresses are controlled by SANYO.

Single-Chip RDS

Signal-Processing System LSI