UBA2050 Ver la hoja de datos (PDF) - Philips Electronics
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UBA2050 Datasheet PDF : 52 Pages
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Philips Semiconductors
One-chip telephone ICs with speech,
dialler and ringer functions
Product specification
UBA2050(A); UBA2051(A;C)
GENERAL DESCRIPTION
The ICs UBA2050, UBA2050A, UBA2051, UBA2051A and
UBA2051C contain all the functions needed to build a fully
electronic telephone set.
In many places in the text, figures and tables, the
description is not applicable for all the five types, but only
for one or two or for a combination. These combinations
will be referred to by means of short denotations as given
in Table 1.
Table 1 Denotations of types
DENOTATION
UBA2050x
UBA2051x
UBA205x
UBA205xA
UBA205xx
TYPES
UBA2050; UBA2050A
UBA2051; UBA2051A; UBA2051C
UBA2050; UBA2051
UBA2050A; UBA2051A
all five types
The devices incorporate a speech/transmission part, a
dialler part and a ringer part. By offering a wide range of
possible adaptations for each part, the UBA205xx
applications can be easily adapted to meet different
requirements.
Speech/transmission part
The speech/transmission part performs all transmission
and line interface functions required in fully electronic
telephone sets. It performs electronic switching between
transmission and dialling. The IC operates at a DC voltage
down to 1.45 V (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 pin LN in order to create a supply
point at pin VDD. The voltage at pin VDD is regulated at
3.3 V to supply the dialler and ringer parts and peripheral
circuits.
Dialler part
The dialler and ringer parts of the IC are responsible for
the system control, system settings and the generation
and detection of various signals.
The dialler offers a 32-digit last number redial function.
The UBA2051x offers in addition 13 memories
(3 direct + 10 indirect) of 21 digits.
During pulse dialling the DMO output of the UBA205x can
be used to decrease the line voltage. During tone dialling
the LED output of the UBA205xA is used to indicate DTMF
dialling. A keytone is available if a valid key is pressed for
the types UBA2050x and UBA2051C.
Ringer part
The ringer part offers a discriminator input which enables
the MDY/TONE output as soon as a valid ring frequency is
detected. It offers a choice of 4 different 3-tone melodies
and a 4-level volume control, both programmable via the
keyboard. An external very low cost ringer output stage for
a buzzer is needed. Stabilized supply (VDD) during ringer
mode for dialler and ringer part is included.
ORDERING INFORMATION
TYPE NUMBER
UBA2050T
UBA2050AT
UBA2051T
UBA2051AT
UBA2051CT
NAME
SO28
SO28
SO28
SO28
SO28
PACKAGE
DESCRIPTION
plastic small outline package; 28 leads; body width 7.5 mm
plastic small outline package; 28 leads; body width 7.5 mm
plastic small outline package; 28 leads; body width 7.5 mm
plastic small outline package; 28 leads; body width 7.5 mm
plastic small outline package; 28 leads; body width 7.5 mm
VERSION
SOT136-1
SOT136-1
SOT136-1
SOT136-1
SOT136-1
2000 May 19
3
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