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Part Number SAN2202a
Manufacturers Sames
Logo Sames
Description SINGLE CHIP SPEAKERPHONE WITH 8 - OHM LOUDSPEAKER AMPLIFIER
Datasheet SAN2202a DatasheetSAN2202a Datasheet (PDF)

  SAN2202a   SAN2202a
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.



SAN2202 SAN2202a SAN2202b


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