SAN3021 Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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SAN3021

SA2531/2 Single Chip Telephone: Using dynamic microphone as tone ringer

South African Micro Electronic Systems 

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SAN3021

APPLICATION NOTE

SA2531/2 Single Chip Telephone:

Using dynamic microphone

as tone ringer

1 Scope

This Application Note describes how to modify the standard application AN1500A to use a dynamic microphone

instead of the standard electret microphone. Additionally, an application is shown, which uses the dynamic

microphone as tone ringer.

2 Key Features

• Updating existing systems using dynamic handset microphone

• No need for a piezo ringer when using the dynamic microphone as tone ringer

Table of Contents

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

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

3 OTHER APPLICABLE DOCUMENTS AND PAPERS ........................................................................................ 1

4 REVISION STATUS............................................................................................................................................. 1

5 GENERAL DESCRIPTION .................................................................................................................................. 2

6 HARDWARE CONFIGURATION......................................................................................................................... 2

6.1 USING THE DYNAMIC MICROPHONE AS TONE RINGER (SCHEMATIC :A)................................................................. 2

6.1.1 Ringer part ............................................................................................................................................. 2

6.1.2 Microphone amplifier part ...................................................................................................................... 3

6.2 AMPLIFIER FOR GENERAL PURPOSE APPLICATIONS (SCHEMATIC :B) ................................................................... 3

7 APPLICATION SCHEMATIC:............................................................................................................................. 4

8 LIABILITY AND COPYRIGHT STATEMENT...................................................................................................... 5

3 Other applicable documents and papers

Application Note AN1500A: SA2532K Single Chip Telephone Demo Board

4 Revision status

SAN3021 Application Note (this document)

SAN3021 Schematic

Rev. 1.1

SAN3021

PDS038-SA2531/2-004 Rev. B 21-03-00

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