Part Number |
SAN2202 |
Manufacturers |
Sames |
Logo |
|
Description |
SINGLE CHIP SPEAKERPHONE WITH 8 - OHM LOUDSPEAKER AMPLIFIER |
Datasheet |
SAN2202 Datasheet (PDF) |
sames
SAN2202 APPLICATION NOTE
SINGLE CHIP “SPEAKERPHONE” WITH 8 - OHM LOUDSPEAKER AMPLIFIER
1 Scope
This application note describes a low-cost add-on circuit for driving an 8Ω-Loudspeaker to get a simple loudhearing (“Speakerphone”) Telephone. To possible ways of supplying the amplifier are shown: SAN2202a: SAN2202b: Amplifier supply in shunt transistor path Amplifier supply by power extraction circuit (SAN3020)
It can be added to any SA253x application without interfering with PTT-relevant parameters, like AC-impedance, Sidetone cancellation or DC-mask.
2 Key Features • Low cost additional circuit enables use of loudhearing function • Full duplex “handsfree” operation via handset microphone and loudspeaker (at distances <2m between • • • • • • •
telephone and user) Can be added to any SA253x- application Enables use of low cost 8Ω - Loudspeaker High output power with low distortion Entirely powered from the telephone line No influence of loudspeaker amplifier in AC-impedance, sid.