UBA2050

INTEGRATED CIRCUITS DATA SHEET UBA2050(A); UBA2051(A;C) One-chip telephone ICs with speech, dialler and ringer functions Product specification Supersedes data of 1998 Mar 24 File under Integrated Circuits, IC03 2000 May 19 Philips Semiconductors Product specification One-chip telephone ICs with speech, dialler and ringer functions FEATURES Speech/transmission part Low DC line voltage; operates down to 1.45 V (excluding voltage drop over external polarity guard) Line voltage regulator with adjustable DC voltage Regulated 3.3 V supply (VDD) for the dialler part and peripherals compatible with: – Speech mode – Ringer mode – Trickle mode. Unregulated supply (VCC) for the transmission part and peripherals Transmit stage with: – Microphone amplifier with symmetrical high-impedance inputs – DTMF input 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. AGC: line loss compensation for microphone and receive amplifiers. Dialler part Last Number Redial (LNR) (32 digits) Pulse dialling: – 10 PPS and 20 PPS (resistor option) – M/B 2 : 3 and 1 : 2 (resistor option). DTMF timing: – Manual dialling with minimum duration for bursts and pauses (85/85 ms) – Calibrated timing during redialling (85/85 ms). Pulse or tone mode select at start-up (resistor option) Flash function (600, 300, 98 and 80 ms) (resistor options) A...