SAN2202

PDS038-SA2531/2-001

Rev. B

21-03-00

This application note describes a low-cost add-on circuit for driving an 8

Ω-Loudspeaker to get a simple loudhearing

(“Speakerphone”) Telephone.

To possible ways of supplying the amplifier are shown:

SAN2202a:

Amplifier supply in shunt transistor path

SAN2202b:

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.

telephone and user)

handset microphone and loudspeaker

sames

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SAN2202

APPLICATION NOTE

SINGLE CHIP “SPEAKERPHONE” WITH

8 - OHM LOUDSPEAKER AMPLIFIER

1 Scope

2 Key Features