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UBA2050

One-chip telephone ICs with speech, dialler and ringer functions

Philips Electronics 

Philips Semiconductors

One-chip telephone ICs with speech,

dialler and ringer functions

Product specification

UBA2050(A); UBA2051(A;C)

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)

• Access pause time 2.0 and 3.6 s (resistor option);

access pauses in series are possible

• [∗/T] key (for mixed mode dialling) or separate

[P → T] key

• Repertory memory integrity check

• Keytone generation (only UBA2050, UBA2050A and

UBA2051C)

• Dial Mode Output (DMO) function during pulse dialling

and flash function (only UBA2050 and UBA2051)

• LED output for DTMF dialling indication (only

UBA2050A and UBA2051A)

• Function keys:

– [LNR/P], [R] and [P → T]

– [STORE], [MEM], [M1], [M2] and [M3]

(only UBA2051, UBA2051A and UBA2051C).

• Resistor options:

– [∗/T] key definition (MMS)

– Pulse or Tone mode Selection (PTS)

– Flash Time Selection (FTSA and FTSB)

– Make/Break ratio Selection (MBS)

– Pulses Per Second (PPS)

– Access Pause Time (APT).

• 13 repertory numbers (only UBA2051, UBA2051A and

UBA2051C):

– 3 direct memories (21 digits)

– 10 indirect memories (21 digits).

• Supply and temperature independent tone output

• On-chip DTMF filtering for low output distortion

(“CEPT CS 203” compatible)

• On-chip oscillator suitable for low-cost 3.579545 MHz

quartz crystal or ceramic resonator

• Uses standard single-contact keyboard

• Keyboard entries fully debounced.

Ringer part

• Ringer input frequency discrimination

• 3-tone ringer with 4 programmable melodies (selectable

via keyboard by keys [1] to [4])

• 4-level volume control (selectable via keyboard by

keys [5] to [8]).

2000 May 19

2

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