SAN3021
SAN3021 is Single Chip Telephone: Using dynamic microphone as tone ringer manufactured by Sames.
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 2 3 4 5 6 SCOPE................................................................................................................................................................. 1 KEY Features
................................................................................................................................................. 1 OTHER APPLICABLE DOCUMENTS AND PAPERS ........................................................................................ 1 REVISION STATUS............................................................................................................................................. 1 GENERAL DESCRIPTION .................................................................................................................................. 2 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) ......................................
