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SAN2202 - SINGLE CHIP SPEAKERPHONE WITH 8 - OHM LOUDSPEAKER AMPLIFIER

General Description

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

Key Features

  • Low cost additional circuit enables use of loudhearing function.
  • Full duplex “handsfree” operation via handset microphone and loudspeaker (at distances.

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Datasheet Details

Part number SAN2202
Manufacturer Sames
File Size 81.94 KB
Description SINGLE CHIP SPEAKERPHONE WITH 8 - OHM LOUDSPEAKER AMPLIFIER
Datasheet download datasheet SAN2202 Datasheet

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SAN2202a SINGLE CHIP SPEAKERPHONE WITH 8 - OHM LOUDSPEAKER AMPLIFIER
SAN2202b SINGLE CHIP SPEAKERPHONE WITH 8 - OHM LOUDSPEAKER AMPLIFIER
SAN3010 SINGLE CHIP TELEPHONE INTERFACE FOR KEYBOARD ENTRY VIA uC
SAN3020 SINGLE CHIP TELEPHONE POWER EXTRACTION FOR EXTERNAL LOADS
SAN3021 Single Chip Telephone: Using dynamic microphone as tone ringer

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.