SAN3021
PDS038-SA 2531/2-004 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.
•
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 U
SING THE DYNAMIC MICROPHONE AS TONE RINGER
(
SCHEMATIC
:
A
)................................................................. 2
6.1.1 Ringer part............................................................................................................................................. 2
6.1.2 Microphone amplifier part ...................................................................................................................... 3
6.2 A
MPLIFIER 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
samessames
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
