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TEA1114A Scheda tecnica(PDF) 2 Page - NXP Semiconductors |
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TEA1114A Scheda tecnica(HTML) 2 Page - NXP Semiconductors |
2 / 28 page 2000 Mar 21 2 Philips Semiconductors Product specification Low voltage telephone transmission circuit with dialler interface and regulated strong supply TEA1114A FEATURES • Low DC line voltage; operates down to 1.45 V (excluding voltage drop over external polarity guard) • Line voltage regulator with adjustable DC voltage • 3.3 V regulated strong supply point for peripheral circuits compatible with: – Speech mode – Ringer mode – Trickle mode. • Transmit stage with: – Microphone amplifier with symmetrical high impedance inputs – DTMF amplifier with confidence tone on receive output. • Receive stage with: – Receive amplifier with asymmetrical output – Earpiece amplifier with adjustable gain (and gain boost facility) for all types of earpieces. • MUTE input for pulse or DTMF dialling • AGC line loss compensation for microphone and receive amplifiers. APPLICATIONS • Line powered telephone sets with LCD module • Cordless telephones • Fax machines • Answering machines. GENERAL DESCRIPTION The TEA1114A is a bipolar integrated circuit that performs all speech and line interface functions required in fully electronic telephone sets. It performs electronic switching between speech and dialling. The IC operates at a line voltage down to 1.45 V DC (with reduced performance) to facilitate the use of telephone sets connected in parallel. When the line current is high enough, a fixed amount of current is derived from the LN pin in order to create a strong supply point at pin VDD. The voltage at pin VDD is regulated to 3.3 V to supply peripherals such as dialler, LCD module and microcontroller. ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TEA1114A DIP16 plastic dual in-line package; 16 leads (300 mil) SOT38-4 TEA1114AT SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 TEA1114AUH − bare die; on foil − |
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