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SAN2202

SINGLE CHIP “SPEAKERPHONE” WITH 8 - OHM LOUDSPEAKER AMPLIFIER

South African Micro Electronic Systems 

SAN2202

TABLE OF CONTENTS

1 SCOPE.............................................................................................................................................................................................................1

2 KEY FEATURES ..............................................................................................................................................................................................1

3 OTHER APPLICABLE DOCUMENTS AND PAPERS ......................................................................................................................................3

4 REVISION STATUS .........................................................................................................................................................................................3

5 GENERAL DESCRIPTION ...............................................................................................................................................................................3

5.1 AMPLIFIER SUPPLY: COMPARISON OF SAN2202A AND SAN2202B: ..............................................................................................................3

6 BLOCK DIAGRAM ...........................................................................................................................................................................................4

6.1 HOW TO AVOID HOWLING .............................................................................................................................................................................4

7 CIRCUIT DESCRIPTION ..................................................................................................................................................................................5

7.1 8Ω LOUDSPEAKER AMPLIFIER.......................................................................................................................................................................5

7.2 AMPLIFIER SUPPLY IN SHUNT TRANSISTOR PATH ............................................................................................................................................5

7.3 AMPLIFIER SUPPLY BY POWER EXTRACTION CIRCUIT SAN3020 ......................................................................................................................5

8 MEASUREMENT RESULTS & CURVES .........................................................................................................................................................6

8.1 FREQUENCY RESPONSE ..............................................................................................................................................................................6

8.2 MAXIMUM SENDING LEVEL ............................................................................................................................................................................6

8.3 MAXIMUM OUTPUT POWER ...........................................................................................................................................................................6

8.4 ON-RESISTANCE IN PULSE DIALING ...............................................................................................................................................................7

9 APPLICATION SCHEMATIC............................................................................................................................................................................8

10 LIABILITY AND COPYRIGHT STATEMENT ..................................................................................................................................................9

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