TEA1081

INTEGRATED CIRCUITS DATA SHEET TEA1081 Supply circuit with power-down for telephone set peripherals Product specification Supersedes data of February 1988 File under Integrated Circuits, IC03 September 1994 Philips Semiconductors Philips Semiconductors Product specification Supply circuit with power-down for telephone set peripherals FEATURES High input impedance for audio signals Low DC series resistance High output current Large audio signal handling capability Low distortion Two modes of operation: – output voltage that follows the DC line voltage – regulated output voltage Power-down input Low number of external components. QUICK REFERENCE DATA SYMBOL VLN VO ∆VLN-O RS IO PARAMETER operating DC line voltage DC output voltage voltage drop from line to output internal series resistance output current (pin 7) TEA1081 TEA1081T VLN(rms) IINT Tamb AC line voltage (RMS value) internal supply current operating ambient temperature VLN = 4 V; IO = 15 mA; THD = 2% VLN = 4 V; IO = 0 mA; PD = LOW; VSP = VO VLN = 4 V − − − − −25 − − 1.5 0.8 − IO = 0 mA CONDITIONS MIN. 2.5 2.0 − − TYP. − − 0.5 20 GENERAL DESCRIPTION TEA1081 The TEA1081 is an integrated circuit for use in line-powered telephone sets to supply peripheral circuits for extended dialling and/or loudspeaker facilities. The IC uses a part of the surplus line current normally drawn by the voltage regulator of the speech/transmission circuit. A power-down function isolates the IC from its load and reduces th...