Philips Semiconductors APPLICATION NOTELow voltage FM stereo radiowith TEA5767/68AN10133Application NoteAN10133 Philips SemiconductorsDRAFT2Low voltage FM stereo radio with TEA5767/68This document describes an application in which the FM stereo radio TEA5767/68 is being used. This newgeneration single-chip stereo radio is alignment free. Because of its low power consumption, small size andsmall FM application, this tuner will lead to a breakthrough in the market of portable consumer products, asmobile phone, CD and MP3 players.The radio can tune into the European, Japan and US FM bands.Abstract© Philips Electronics N.V. 2003All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyrightowner.The information presented in this document does not form part of any quotation or contract, is believed to be accurate andreliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.Application NoteAN10133 Philips SemiconductorsDRAFT3Low voltage FM stereo radio with TEA5767/68APPLICATION NOTELow voltage FM stereo radiowith TEA5767/68AN10133Author(s):M Ait MoulayPhilips Semiconductors Strategic Partnership CatenaThe NetherlandsKeywordsTEA5767/68FM-stereo RadioLow voltageDate: 18-06-2002Application NoteAN10133 Philips SemiconductorsDRAFT4Low voltage FM stereo radio with TEA5767/68The TEA5767/68 is a single chip stereo FM receiver. This new generation low voltage FM radio has a fullyintegrated IF-selectivity and demodulation. The IC does not require any alignment, which makes the use ofbulky and expensive external components unnecessary. The digital tuning is based on the conventional PLL concept. Via software, the radio can be tuned into theEuropean, Japan or US FM band.The power consumption of the tuner is low. The current is about 13mA and the supply voltage can be variedbetween 2.5 and 5V.The radio can find its application in many areas especially portable applications as mobile phones, CD and MP3players.This application note describes this FM radio in a small size and low voltage application. To demonstrate theoperation of the tuners a demoboard is developed, which can be extended with a software controllable amplifierand a RDS chip. The whole application can be controlled from a PC by means of demo software.SummaryApplication NoteAN10133 Philips SemiconductorsDRAFT5Low voltage FM stereo radio with TEA5767/68CONTENTS1 INTRODUCTION ...........................................................................................................................92 SYSTEM GLOBAL VIEW............................................................................................................10 2.1 The TEA5767............................................................................................................................................................10 2.2 FM STEREO application ..........................................................................................................................................11 2.3 TEA5767HN package ...............................................................................................................................................123 THE TEA5767HN......................................................................................................................... 14 3.1 Low Noise Amplifier.................................................................................................................................................14 3.2 Mixer .........................................................................................................................................................................15 3.3 IF selectivity..............................................................................................................................................................15 3.4 Limiter.......................................................................................................................................................................15 3.5 Demodulator..............................................................................................................................................................15 3.6 The MPX decoder .....................................................................................................................................................163.6.1 The PLL............................................................................................................................................................163.6.2 The pilot detector..............................................................................................................................................163.6.3 The SNC...........................................................................................................................................................163.6.4 The matrix decoder...........................................................................................................................................173.6.5 HCC..................................................................................................................................................................17 3.7 The softmute..............................................................................................................................................................184 THE TUNING SYSTEM ............................................................................................................... 20 4.1 The PLL tuning system .............................................................................................................................................20 4.2 PLL word calculation ................................................................................................................................................214.2.1 High side injection tuning ................................................................................................................................214.2.2 Low side injection tuning .................................................................................................................................23 4.3 IF counter