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Order this document by MC33215/D MC33215 Advance Information Telephone Line Interface and 52 1 Speakerphone Circuit FB SUFFIX The MC33215 is developed for use in fully electronic telephone sets with PLASTIC PACKAGE speakerphone functions. The circuit performs the ac and dc line termination, CASE 848B 2–4 wire conversion, line length AGC and DTMF transmission. The (TQFP–52) speakerphone part includes a half duplex controller with signal and noise monitoring, base microphone and loudspeaker amplifiers and an efficient supply. The circuit is designed to operate at low line currents down to 4.0 mA enabling parallel operation with a classical telephone set. • Highly Integrated Cost Effective Solution • Straightforward AC and DC Parameter Adjustments 42 • Efficient Supply for