UBA2051
Description
The ICs UBA2050, UBA2050A, UBA2051, UBA2051A and UBA2051C contain all the functions needed to build a fully electronic telephone set.
Key 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
- 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
- AGC: line loss pensation 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)
