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DATA SHEET
Product specification
Supersedes data of 1998 Mar 24
File under Integrated Circuits, IC03
2000 May 19
INTEGRATED CIRCUITS
UBA2050(A); UBA2051(A;C)
One-chip telephone ICs with
speech, dialler and ringer functions
2000 May 19
2
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
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 (V
DD
) for the dialler part and
peripherals compatible with:
Speech mode
Ringer mode
Trickle mode.
Unregulated supply (V
CC
) 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
3
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
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
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 V
DD
. The voltage at pin V
DD
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 (V
DD
) during ringer
mode for dialler and ringer part is included.
DENOTATION
TYPES
UBA2050x
UBA2050; UBA2050A
UBA2051x
UBA2051; UBA2051A; UBA2051C
UBA205x
UBA2050; UBA2051
UBA205xA
UBA2050A; UBA2051A
UBA205xx
all five types
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
UBA2050T
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
UBA2050AT
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
UBA2051T
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
UBA2051AT
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
UBA2051CT
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
2000 May 19
4
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Speech/transmission part
I
line
line current operating range
normal operation
11
-
140
mA
with reduced performance
1
-
11
mA
V
LN
DC line voltage
I
line
= 15 mA
4.05
4.35
4.65
V
I
CC
internal current consumption
V
CC
= 3.6 V
-
1.25
1.5
mA
V
CC
supply voltage for internal circuitry
(unregulated)
I
P
= 0 mA
-
3.6
-
V
V
DD
regulated supply voltage for peripherals
speech mode;
I
DD
=
-
2.6 mA
3.0
3.3
3.6
V
ringer mode; I
DD
= 75 mA
3.0
3.3
3.6
V
I
DD
available supply current for peripherals
-
-
-
2.6
mA
G
v(TX)
typical voltage gain for microphone
amplifier
V
MIC
= 4 mV (RMS)
43.2
44.2
45.2
dB
G
v(RX)
typical voltage gain for receiving amplifier
V
IR
= 4 mV (RMS)
32.4
33.4
34.4
dB
G
v(QR)
gain setting range for earpiece amplifier
R
E1
= 100 k
-
14
-
+12
dB
G
v(trx)
gain control range for microphone and
receive amplifiers
I
line
= 85 mA; referenced to
I
line
= 15 mA
-
6.0
-
dB
G
v(trx)(m)
gain reduction for microphone and receive
amplifiers
in DTMF mode
-
80
-
dB
Dialler part
V
HG(LN)(rms)
high group frequency voltage (RMS value)
on line
R
DTMF1
= 20 k
;
R
DTMF2
= 2.74 k
353
435
536
mV
V
LG(LN)(rms)
low group frequency voltage (RMS value)
on line
R
DTMF1
= 20 k
;
R
DTMF2
= 2.74 k
277
341
420
mV
G
V
pre-emphasis of group
1.5
2.0
2.5
dB
THD
total harmonic distortion
-
-
25
-
dB
Ringer part
f
ring
ringer detection frequency
13
-
-
Hz
2000
May
19
5
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and r
inger functions
UBA2050(A); UBA2051(A;C)
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BLOCK DIA
GRAM
u
ll pagewidth
KEYBOARD
DETECTOR
FLASH
KEYTONE
TONE
GENERATOR
TIMING/
CONTROL
RINGER
PART
DETECTOR/
GENERATOR
DTMF/
RINGER
dB
MDY
MUTE
DTMF
INDICATION
PULSE
VCC
DIALLER
PART
SPEECH/TRANSMISSION
PART
IR
DTMF
VDD
LED
DMO
DP/FL
KT
MDY/TONE
UBA205xx
MIC
+
MIC
-
GND
FCA138
LN
SUPPLY
AGC
SLPE
SLPE
XTAL
CE/CSI
CE/FDI
VCC
GAR
REG
RX
QR
AGC
R1
R2
R3
R4
C1
C2
C3
C4
EARPIECE
AMPLIFIER
RECEIVE
AMPLIFIER
TRANSMIT
AMPLIFIER
VDD
REGULATOR
Fig.1 Block diagram.
UBA2050 and UBA2050A: C4 output not available.
UBA2051 and UBA2051A: KT output not available.
UBA2050 and UBA2051: DMO output available, LED output not available.
UBA2050A and UBA2051A: LED output available, DMO output not available.
UBA2051C: KT output available, DMO and LED outputs not available.