SAN3021 Datasheet, PDF (1/5 Pages) Sames – Single Chip Telephone: Using dynamic microphone as tone ringer

sames
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