UTC1062A

UTC1062A LI NEAR I NTEGRATED CI RCUI T LOW VOLTAGE TELEPHONE TRANSMISSION CIRCUIT WITH DIALLER INTERFACE DESCRIPTION The UTC1062A is a bipolar integrated circuit per- forming all speech and line interface function required in the fully electronic telephone sets. It performs electronic switching between dialing speech. The circuit is able to operate down to d.c. line voltage of 1.6v (with reduced performance) to facilitate the use of more telephone sets in parallel. FEATURES * Low d.c. line voltage; operates down to 1.6V (excluding polarity guard) * Voltage regulator with adjustment static resistance * Provides supply with limited current for external circuitry * Symmetrical high-impedance inputs (64k Ω for dynamic, magnetic or piezoelectric microphones * Asymmetrical high-impedance inputs (32k Ω for electric microphones * DTMF signal input with confidence tone * Mute input for pulse or DTMF dialing * Receiving amplifier for several types of earphones * Large amplification setting range on microphone and ear piece amplifiers * Line loss compensation facility, line current dependent (microphone and ear piece amplifiers) * Gain control adaptable to exchange supply * Possibility to adjust the d.c. line voltage DIP-16 w w w .D at aS Line voltage at Iline=15mA Line current operating range[pin1] normal operation with reduced performance Internal supply current Supply current for peripherals at Iline=15 mA mute input HIGH Vcc>2.2V Vcc>2.8V Voltage amplification range microp...