SAN3021

PDS038-SA2531/2-004

Rev. B

21-03-00

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.

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

Application Note AN1500A: SA2532K Single Chip Telephone Demo Board

SAN3021 Application Note (this document)

SAN3021 Schematic

Rev. 1.1

sames

sames

sames

sames

SA2531/2 Single Chip Telephone:

Using dynamic microphone

as tone ringer

SAN3021

APPLICATION NOTE

1 Scope

2 Key Features

3 Other applicable documents and papers

4 Revision status