3 5.1 AMPLIFIER SUPPLY: COMPARISON OF SAN2202A AND SAN2202B: 3 6 BLOCK DIAGRAM 4 6.1 HOW TO AVOID HOWLING 4 7 CIRCUIT DESCRIPTION 5 7.1 8Ω LOUDSPEAKER AMPLIFIER 5 7.2 AMPLIFIER SUPPLY IN SHUNT TRANSISTOR PATH 5 7.3 AMPLIFIER SUPPLY BY POWER EXTRACTION CIRCUIT SAN3020 5 8 MEASUREMENT RESULTS & CURVES
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
SAN2202b Features
* Low cost additional circuit enables use of loudhearing function
* Full duplex “handsfree” operation via handset microphone and loudspeaker (at distances
Datasheet Details
SAN2202b
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Single chip speakerphone with 8 - ohm loudspeaker amplifier.
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