Loading...
INTEGRATED CIRCUITS
DATA SHEET
UBA2050(A); UBA2051(A;C)
One-chip telephone ICs with speech, dialler and ringer functions
Product specification |
2000 May 19 |
Supersedes data of 1998 Mar 24
File under Integrated Circuits, IC03
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
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)
∙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 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
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 |
TYPES |
|
|
UBA2050x |
UBA2050; UBA2050A |
|
|
UBA2051x |
UBA2051; UBA2051A; UBA2051C |
|
|
UBA205x |
UBA2050; UBA2051 |
|
|
UBA205xA |
UBA2050A; UBA2051A |
|
|
UBA205xx |
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.
ORDERING INFORMATION
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.
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 |
3 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
QUICK REFERENCE DATA
SYMBOL |
PARAMETER |
CONDITIONS |
MIN. |
TYP. |
MAX. |
UNIT |
|
|
|
|
|
|
|
Speech/transmission part |
|
|
|
|
|
|
|
|
|
|
|
|
|
Iline |
line current operating range |
normal operation |
11 |
− |
140 |
mA |
|
|
with reduced performance |
1 |
− |
11 |
mA |
|
|
|
|
|
|
|
VLN |
DC line voltage |
Iline = 15 mA |
4.05 |
4.35 |
4.65 |
V |
ICC |
internal current consumption |
VCC = 3.6 V |
− |
1.25 |
1.5 |
mA |
VCC |
supply voltage for internal circuitry |
IP = 0 mA |
− |
3.6 |
− |
V |
|
(unregulated) |
|
|
|
|
|
|
|
|
|
|
|
|
VDD |
regulated supply voltage for peripherals |
speech mode; |
3.0 |
3.3 |
3.6 |
V |
|
|
IDD = −2.6 mA |
|
|
|
|
|
|
ringer mode; IDD = 75 mA |
3.0 |
3.3 |
3.6 |
V |
IDD |
available supply current for peripherals |
|
− |
− |
−2.6 |
mA |
Gv(TX) |
typical voltage gain for microphone |
VMIC = 4 mV (RMS) |
43.2 |
44.2 |
45.2 |
dB |
|
amplifier |
|
|
|
|
|
|
|
|
|
|
|
|
Gv(RX) |
typical voltage gain for receiving amplifier |
VIR = 4 mV (RMS) |
32.4 |
33.4 |
34.4 |
dB |
Gv(QR) |
gain setting range for earpiece amplifier |
RE1 = 100 kΩ |
−14 |
− |
+12 |
dB |
Gv(trx) |
gain control range for microphone and |
Iline = 85 mA; referenced to |
− |
6.0 |
− |
dB |
|
receive amplifiers |
Iline = 15 mA |
|
|
|
|
Gv(trx)(m) |
gain reduction for microphone and receive |
in DTMF mode |
− |
80 |
− |
dB |
|
amplifiers |
|
|
|
|
|
|
|
|
|
|
|
|
Dialler part |
|
|
|
|
|
|
|
|
|
|
|
|
|
VHG(LN)(rms) |
high group frequency voltage (RMS value) |
RDTMF1 = 20 kΩ; |
353 |
435 |
536 |
mV |
|
on line |
RDTMF2 = 2.74 kΩ |
|
|
|
|
VLG(LN)(rms) |
low group frequency voltage (RMS value) |
RDTMF1 = 20 kΩ; |
277 |
341 |
420 |
mV |
|
on line |
RDTMF2 = 2.74 kΩ |
|
|
|
|
GV |
pre-emphasis of group |
|
1.5 |
2.0 |
2.5 |
dB |
THD |
total harmonic distortion |
|
− |
−25 |
− |
dB |
|
|
|
|
|
|
|
Ringer part |
|
|
|
|
|
|
|
|
|
|
|
|
|
fring |
ringer detection frequency |
|
13 |
− |
− |
Hz |
2000 May 19 |
4 |
_ |
|
|
|
|
|
|
|
|
|
|
|
DIAGRAM BLOCK |
functionsringerand dialler |
withICstelephonechip-One |
19 May 2000 |
|
|
|
|
|
|
pagewidth ll |
|
|
|
RX |
|||
|
|
KT |
DP/FL |
DMO |
|
LED |
VDD |
DTMF |
|
IR |
LN |
|
|
|
|
DIALLER |
|
|
|
|
|
|
|
|
SPEECH/TRANSMISSION |
|
|
|
|
|
PART |
|
|
|
|
|
|
|
VDD |
PART |
GAR |
|
|
|
|
|
|
|
|
|
|
|
REGULATOR |
|
|
|
|
||
|
|
FLASH |
|
PULSE |
DTMF |
|
|
VCC |
EARPIECE |
|
|
|
|
|
|
|
|
INDICATION |
|
|
AMPLIFIER |
|
|
|
|
||||
|
|
|
|
|
|
|
QR |
|
|
|
||||
R1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
R2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
R3 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
R4 |
KEYBOARD |
KEYTONE |
|
|
MUTE |
|
|
|
RECEIVE |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
C1 |
DETECTOR |
|
|
|
|
|
|
|
|
AMPLIFIER |
|
|
|
|
C2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
speech, |
C3 |
|
|
|
dB |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
C4 |
|
TONE |
|
MDY |
DTMF/ |
|
|
|
AGC |
AGC |
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||
|
|
GENERATOR |
|
RINGER |
|
|
|
|
|
|
|
|
||
5 |
|
|
|
|
|
|
|
SLPE |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
TRANSMIT |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
AMPLIFIER |
|
|
|
|
XTAL |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CE/CSI |
TIMING/ |
|
|
|
|
|
|
|
|
|
REG |
|
|
|
CONTROL |
|
|
|
|
|
|
|
|
|
|
UBA2050(A); |
|||
|
|
|
|
|
|
|
|
|
|
|
||||
CE/FDI |
|
|
RINGER |
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
PART |
|
|
|
|
|
SUPPLY |
VCC |
|
|
|
|
|
|
|
DETECTOR/ |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
GENERATOR |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
UBA205xx |
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
FCA138 |
|
|
|
|
|
|
|
|
MDY/TONE |
|
MIC+ |
MIC− |
GND |
SLPE |
|
UBA2051(A;C) |
||
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. |
|
|
|
|
|
|
|
|
|
|
||||
|
|
|
|
|
Fig.1 |
Block diagram. |
|
|
|
|
|
|
|
|
Semiconductors Philips
specification Product
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
PINNING
|
SYMBOL |
|
|
PIN |
|
|
DESCRIPTION |
|
|
|
|
|
|
|
|||
|
UBA2050 |
UBA2050A |
UBA2051 |
UBA2051A |
UBA2051C |
|||
|
|
|
|
|||||
|
|
|
|
|
|
|
|
|
|
LN |
1 |
1 |
1 |
1 |
1 |
positive line terminal |
|
|
|
|
|
|
|
|
|
|
|
SLPE |
2 |
2 |
2 |
2 |
2 |
slope (DC resistance) adjustment |
|
|
|
|
|
|
|
|
|
|
|
REG |
3 |
3 |
3 |
3 |
3 |
line voltage regulator decoupling |
|
|
|
|
|
|
|
|
|
|
|
IR |
4 |
4 |
4 |
4 |
4 |
receive amplifier input |
|
|
|
|
|
|
|
|
|
|
|
AGC |
5 |
5 |
5 |
5 |
5 |
automatic gain control and line-loss |
|
|
|
|
|
|
|
|
|
compensation |
|
|
|
|
|
|
|
|
|
|
DTMF |
6 |
6 |
6 |
6 |
6 |
DTMF transmit input |
|
|
|
|
|
|
|
|
|
|
|
VDD |
7 |
7 |
7 |
7 |
7 |
stabilized supply for dialler and |
|
|
|
|
|
|
|
|
|
ringer parts |
|
|
|
|
|
|
|
|
|
|
XTAL |
8 |
8 |
8 |
8 |
8 |
oscillator input |
|
|
|
|
|
|
|
|
|
|
|
|
|
9 |
9 |
9 |
9 |
9 |
dial pulse/flash output (active LOW) |
|
DP/FL |
|||||||
|
DMO |
10 |
− |
10 |
− |
− |
dial mode output |
|
|
|
|
|
|
|
|
||
LED |
− |
10 |
− |
10 |
− |
DTMF mode indication output |
||
|
|
|
|
|
|
|
||
CE/CSI |
11 |
11 |
11 |
11 |
11 |
chip enable/cradle switch input; |
||
|
|
|
|
|
|
|
|
note 1 |
|
|
|
|
|
|
|
||
CE/FDI |
12 |
12 |
12 |
12 |
12 |
chip enable/frequency discrimination |
||
|
|
|
|
|
|
|
|
input |
|
|
|
|
|
|
|
||
MDY/TONE |
13 |
13 |
13 |
13 |
13 |
melody (ringer) output/DTMF |
||
|
|
|
|
|
|
|
|
generator output |
|
|
|
|
|
|
|
||
KT |
14 |
14 |
− |
− |
10 |
keytone output |
||
|
|
|
|
|
|
|
||
C4 |
− |
− |
14 |
14 |
14 |
keyboard input/output C4 |
||
|
|
|
|
|
|
|
|
|
|
C3 |
15 |
15 |
15 |
15 |
15 |
keyboard input/output C3 |
|
|
|
|
|
|
|
|
|
|
|
C2 |
16 |
16 |
16 |
16 |
16 |
keyboard input/output C2 |
|
|
|
|
|
|
|
|
|
|
|
C1 |
17 |
17 |
17 |
17 |
17 |
keyboard input/output C1 |
|
|
|
|
|
|
|
|
|
|
|
R4 |
18 |
18 |
18 |
18 |
18 |
keyboard input/output R4 |
|
|
|
|
|
|
|
|
|
|
|
R3 |
19 |
19 |
19 |
19 |
19 |
keyboard input/output R3 |
|
|
|
|
|
|
|
|
|
|
|
R2 |
20 |
20 |
20 |
20 |
20 |
keyboard input/output R2 |
|
|
|
|
|
|
|
|
|
|
|
R1 |
21 |
21 |
21 |
21 |
21 |
keyboard input/output R1 |
|
|
|
|
|
|
|
|
|
|
|
GND |
22 |
22 |
22 |
22 |
22 |
negative line terminal |
|
|
|
|
|
|
|
|
|
|
|
QR |
23 |
23 |
23 |
23 |
23 |
earpiece amplifier output |
|
|
|
|
|
|
|
|
|
|
|
GAR |
24 |
24 |
24 |
24 |
24 |
gain adjustment earpiece amplifier |
|
|
|
|
|
|
|
|
|
|
|
RX |
25 |
25 |
25 |
25 |
25 |
receive amplifier output |
|
|
|
|
|
|
|
|
|
|
|
MIC+ |
26 |
26 |
26 |
26 |
26 |
non-inverting microphone amplifier |
|
|
|
|
|
|
|
|
|
input |
|
|
|
|
|
|
|
|
|
|
MIC− |
27 |
27 |
27 |
27 |
27 |
inverting microphone amplifier input |
|
|
|
|
|
|
|
|
|
|
|
VCC |
28 |
28 |
28 |
28 |
28 |
supply for speech/transmission part |
|
|
|
|
|
|
|
|
|
and peripherals |
|
|
|
|
|
|
|
||
Note |
|
|
|
|
|
|
||
1.The cradle switch and the two positions ‘handset on the cradle’ and ‘handset lifted’ are further on in this document referred to as ‘hook-switch’, respectively ‘on-hook’ and ‘off-hook’ position.
2000 May 19 |
6 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
|
LN |
1 |
|
|
28 |
VCC |
|
SLPE |
2 |
|
|
27 |
MIC− |
|
REG |
3 |
|
|
26 |
MIC+ |
|
IR |
4 |
|
|
25 |
RX |
|
AGC |
5 |
|
|
24 |
GAR |
DTMF |
6 |
|
|
23 |
QR |
|
|
VDD |
7 |
|
UBA2050T |
22 |
GND |
|
XTAL |
8 |
|
21 |
R1 |
|
|
|
|
||||
|
|
9 |
|
|
20 |
R2 |
DP/FL |
|
|
||||
|
DMO 10 |
|
|
19 |
R3 |
|
CE/CSI |
11 |
|
|
18 |
R4 |
|
CE/FDI |
12 |
|
|
17 |
C1 |
|
MDY/TONE 13 |
|
|
16 |
C2 |
||
|
KT |
14 |
|
|
15 |
C3 |
|
|
|
|
|
|
|
|
|
|
|
MGT042 |
|
|
Fig.2 Pin configuration (UBA2050T).
handbook, halfpage
LN |
1 |
28 |
VCC |
SLPE |
2 |
27 |
MIC− |
REG |
3 |
26 |
MIC+ |
IR |
4 |
25 |
RX |
AGC |
5 |
24 |
GAR |
DTMF |
6 |
23 |
QR |
VDD |
7 |
22 |
GND |
|
8 |
UBA2051T |
|
XTAL |
21 |
R1 |
|
|
9 |
20 |
R2 |
DP/FL |
|||
DMO 10 |
19 |
R3 |
|
handbook, halfpage |
|
|
|
|
VCC |
|
|
LN |
1 |
|
|
28 |
|
|
SLPE |
2 |
|
|
27 |
MIC− |
|
REG |
3 |
|
|
26 |
MIC+ |
|
IR |
4 |
|
|
25 |
RX |
|
AGC |
5 |
|
|
24 |
GAR |
DTMF |
6 |
|
|
23 |
QR |
|
|
VDD |
7 |
|
UBA2050AT |
22 |
GND |
|
XTAL |
8 |
|
21 |
R1 |
|
|
|
|
||||
|
|
9 |
|
|
20 |
R2 |
DP/FL |
|
|
||||
|
LED |
10 |
|
|
19 |
R3 |
CE/CSI |
11 |
|
|
18 |
R4 |
|
CE/FDI |
12 |
|
|
17 |
C1 |
|
MDY/TONE 13 |
|
|
16 |
C2 |
||
|
KT |
14 |
|
|
15 |
C3 |
|
|
|
|
|
|
|
|
|
|
|
MGT043 |
|
|
Fig.3 Pin configuration (UBA2050AT).
handbook, halfpage
LN |
1 |
28 |
VCC |
SLPE |
2 |
27 |
MIC− |
REG |
3 |
26 |
MIC+ |
IR |
4 |
25 |
RX |
AGC |
5 |
24 |
GAR |
DTMF |
6 |
23 |
QR |
VDD |
7 |
22 |
GND |
|
8 |
UBA2051AT |
|
XTAL |
21 |
R1 |
|
|
9 |
20 |
R2 |
DP/FL |
|||
LED |
10 |
19 |
R3 |
CE/CSI |
11 |
18 |
R4 |
CE/CSI |
11 |
18 |
R4 |
||
CE/FDI |
12 |
17 |
C1 |
CE/FDI |
12 |
17 |
C1 |
||
MDY/TONE 13 |
16 |
C2 |
MDY/TONE 13 |
16 |
C2 |
||||
C4 |
14 |
15 |
C3 |
C4 |
14 |
15 |
C3 |
||
|
|
|
|
|
|
|
|
|
|
|
|
MGT044 |
|
|
|
MGT045 |
|
||
Fig.4 Pin configuration (UBA2051T). |
Fig.5 Pin configuration (UBA2051AT). |
||||||||
2000 May 19 |
7 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
|
LN |
1 |
|
|
|
VCC |
|
|
|
|
28 |
||||
|
SLPE |
|
|
|
|
MIC− |
|
|
2 |
|
|
27 |
|||
|
REG |
3 |
|
|
|
MIC+ |
|
|
|
|
26 |
||||
|
IR |
4 |
|
|
|
RX |
|
|
|
|
25 |
||||
|
AGC |
|
|
|
|
GAR |
|
|
5 |
|
|
24 |
|||
|
|
|
|
|
|
|
|
DTMF |
6 |
|
|
23 |
QR |
||
|
VDD |
|
|
|
|
GND |
|
|
7 |
|
UBA2051CT |
22 |
|||
|
|
|
8 |
|
|
|
|
|
XTAL |
|
|
21 |
R1 |
||
|
|
|
9 |
|
|
|
R2 |
DP/FL |
|
|
20 |
||||
|
KT |
10 |
|
|
|
R3 |
|
|
|
|
19 |
||||
CE/CSI |
11 |
|
|
|
R4 |
||
|
|
18 |
|||||
CE/FDI |
12 |
|
|
|
C1 |
||
|
|
17 |
|||||
MDY/TONE 13 |
|
|
|
C2 |
|||
|
|
16 |
|||||
|
|
|
|
|
|
|
|
|
C4 |
14 |
|
|
15 |
C3 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
FCA128 |
|
|
Fig.6 Pin configuration (UBA2051CT).
FUNCTIONAL DESCRIPTION
The values given in the functional description are typical values unless otherwise specified.
For numbering of components, refer to Figs 7, 37 and 38. Voltage levels are referenced to the negative line terminal GND, except when otherwise specified.
Speech/transmission part
SUPPLY
The supply for the IC and its peripheral circuits is obtained from the telephone line (see Fig.7).
Line interface (pins LN, SLPE and REG)
The IC generates a stabilized reference voltage Vref between pins LN and SLPE. This reference voltage is 4.15 V, is temperature compensated and can be adjusted by means of an external resistor RVA.
The reference voltage can be increased by connecting the resistor RVA between pins REG and SLPE or decreased by connecting the resistor RVA between pins REG and LN.
The voltage at pin REG is used by the internal regulator to
generate Vref and is decoupled by capacitor CREG connected between pins REG and GND. This capacitor,
converted into an equivalent inductance (see Section “Set impedance”), realizes the set impedance conversion from
its DC value (RSLPE) to its AC value (RCC in the audio frequency range).
The voltage at pin SLPE is proportional to the line current, and the voltage VLN at pin LN can be calculated as follows:
VLN = Vref + RSLPE × ISLPE
ISLPE = Iline − ICC − IP − ISUP
where:
Iline = line current
ICC = internal current consumption
IP = supply current for peripheral circuits
ISUP = current consumed by the VDD regulator from pin LN.
Resistor RSLPE is an external resistor connected between
pins SLPE and GND. The preferred value for RSLPE is 20 Ω. Changing the value of RSLPE will affect more than the DC characteristics: it also influences the microphone
and DTMF gains, the gain control characteristics, the sidetone level and the maximum output swing on the line.
The DC current flowing into the set is determined by the exchange supply voltage (Vexch), the feeding bridge
resistance (Rexch), the DC resistance of the telephone line (Rline) and the reference voltage (Vref). The excess current is shunted via pin LN to pin SLPE when the line current
(Iline) is greater than the sum of the supply current of the speech/transmission part (ICC), the current drawn by the
peripheral circuitry connected to VCC (IP) and the input current of the VDD regulator (ISUP). With line currents below Ilow (9 mA), the internal reference voltage (generating Vref) is automatically adjusted to a lower value.
This means that more sets can operate in parallel with DC line voltages (excluding the polarity guard) down to an absolute minimum voltage of 1.45 V. At line currents below Ilow, the circuit has limited sending and receiving levels. This is called the low voltage area.
2000 May 19 |
8 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
Internal supply (pin VCC)
The internal transmission part circuitry is supplied from VCC. This supply voltage is derived from the voltage on pin LN by means of resistor RCC and must be decoupled by capacitor CVCC connected between pins VCC and GND. This supply point may also be used to supply peripheral circuits e.g. an electret microphone taking into account the supply possibilities according to Fig.8.
The voltage VCC (see Fig.9) depends on the current consumed by the transmission part and the peripheral circuits:
VCC = VCC0 − RCC × (IP + IREC)
where:
VCC0 = VLN − ICC × RCC
IREC = the current consumed by the output stage of the earpiece amplifier.
handbook, full pagewidth |
Rline |
Iline |
|
RCC |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
IP |
|
|
|
|
LN |
|
VCC |
|
CVCC |
100 μF |
|
|
|
|
|
|
|
|
|
supply |
|
SUPPLY TRANSMISSION PART |
|
|
|
|
|
electret |
||
|
|
|
|
|
|
microphone |
|||
|
|
|
|
|
|
|
|
|
|
Rexch |
|
from preamp |
|
ISUP |
ICC |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
VDD |
|
VDD |
|
IDD |
|
|
|
|
|
|
|
|
||
|
|
|
|
REGULATOR |
|
|
|
|
|
|
|
|
|
|
|
|
DIALLER/ |
|
|
|
|
|
|
|
|
|
RINGER |
|
|
Vexch |
|
|
|
|
|
|
|
|
ringer- |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
interface/ |
|
|
REG |
|
SLPE |
GND |
|
UBA205xx |
|
peripherals |
|
|
|
|
|
|
||||
C |
REG |
4.7 μF |
ISLPE |
RSLPE |
|
C |
VDD |
220 |
|
|
|
|
20 Ω |
|
|
|
μF |
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
FCA129 |
|
|
|
Fig.7 |
Supply configuration. |
|
|
|
||
2000 May 19 |
9 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
MGL827
3 handbook, halfpage
IP (mA)
1.9 mA
2
1.6 mA
1
(2) (1)
0
0 |
1 |
2 |
3 VCC (V) 4 |
VCC ³ 2.5 V; VLN = 4.35 V at Iline = 15 mA; RCC = 619 W; RSLPE = 20 W.
(1)This curve is valid when the receiving amplifier is not loaded.
(2)This curve is valid when the receiving amplifier is loaded; Vo(rms) = 150 mV; RL = 150 W.
Fig.8 Typical current IP available from VCC for peripheral circuitry.
handbook, halfpage RCC |
VCC |
|
|
|
VCC0 |
Irec |
PERIPHERAL |
IP |
|
CIRCUITS |
|
|||
|
GND |
|
FCA130 |
|
Fig.9 VCC used as supply voltage for peripheral circuits.
Regulated supply point (pin VDD)
The VDD regulator delivers a stabilized voltage to supply the internal dialler and ringer parts and peripheral circuits in transmission mode (nominal VLN) and in ringer mode (VLN = 0 V). The maximum supply current for peripherals is 1.9 mA in dialling mode (DTMF generator on) and
2.6 mA in speech mode (DTMF generator off). The supply conditions in ringer and trickle (on-hook condition) modes must not be disturbed by the peripheral supply currents.
The regulator (see Fig.7) consists of a sense input circuitry (pin LN), a current switch and a VDD output stabilizer (pin VDD). VDD is decoupled by capacitor CVDD.
The regulator function depends on the transmission, ringer and trickle modes as follows:
∙Transmission mode: The regulator operates as a current source at the LN input; it takes a constant current of
ISUP = 4.5 mA (at nominal conditions) from pin LN. The current switch reduces the distortion on the line at large signal swings.
Output VDD follows the DC voltage at pin LN (with typically 0.35 V difference) up to VDD = 3.3 V. The input current of the regulator is constant while the output (source) current is determined by the consumption of the peripherals. The difference between input and output current is shunted by the internal VDD stabilizer.
∙Ringer mode: The regulator operates as a shunt
stabilizer to keep VDD at 3.3 V. The input voltage VLN equals 0 V while the input current into pin VDD is delivered by the ringing signal.
∙Trickle mode: When VDD is below typically 2 V, the regulator is inhibited. The current consumption of the
VDD regulator in trickle mode is very low to save most of the trickle current for memory retention of the dialler and ringer parts.
2000 May 19 |
10 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
handbook, full pagewidth |
Rline |
Iline |
RCC |
|
|
|
|
ILN |
|
ICC |
|
|
|
LN |
|
VCC |
CVCC |
Rexch |
|
|
|
VDD |
100 μF |
|
|
|
|
||
|
|
|
|
|
|
|
|
ISUP |
|
|
IDD |
|
|
|
SENSE |
SWITCH |
|
|
|
|
|
|
|
Vexch |
|
|
|
|
peripherals |
|
|
|
|
|
|
|
|
|
|
VDD regulator |
|
|
UBA205xx |
|
|
CVDD |
|
|
|
GND |
220 μF |
||
|
|
|
|
|
FCA131 |
|
|
|
Fig.10 |
VDD regulator configuration. |
|
SET IMPEDANCE
In the audio frequency range, the dynamic impedance is mainly determined by resistor RCC. The equivalent impedance of the circuit is illustrated in Fig.11.
LN handbook, halfpage
LEQ |
RP |
RCC |
|
619 Ω |
|||
|
|
||
Vref |
REG |
VCC |
|
SLPE |
|
|
|
RSLPE |
CREG |
CVCC |
|
20 Ω |
4.7 μF |
100 μF |
|
GND |
FCA132 |
|
|
|
|
LEQ = CREG × RSLPE × Rp.
Internal resistance RP = 17.5 kΩ.
Fig.11 Equivalent impedance between
LN and GND.
2000 May 19 |
11 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
TRANSMIT STAGES
Microphone signal amplification (pins MIC+ and MIC−)
The UBA205xx has symmetrical microphone inputs. The input impedance between pins MIC+ and MIC− is 64 kΩ (2 × 32 kΩ).
In speech mode, the voltage gain from pins MIC+ and MIC− to pin LN is set at 44.2 dB at 600 Ω line load. Microphone arrangements are illustrated in Fig.12.
Automatic gain control is provided on this amplifier for line loss compensation.
(2)
|
|
VCC |
|
MIC− |
MIC− |
|
MIC− |
|
|
|
|
(1) |
|
|
|
MIC+ |
MIC+ |
|
MIC+ |
|
|
||
|
|
GND |
MGT052 |
|
|
|
a. Magnetic or dynamic microphone. |
b. Electret microphone. |
c. Piezoelectric microphone. |
(1)This resistor may be connected to reduce the terminating impedance.
(2)Extra decoupling capacitor for the microphone supply.
Fig.12 Microphone arrangements.
DTMF amplification (pin DTMF)
When the DTMF amplifier is enabled, dialling tones may be sent on the line. These tones are generated at
pin MDY/TONE and their amplitude can be adjusted by means of an attenuator and filter network (see Fig.35) before being applied to the DTMF amplifier at pin DTMF. These tones are also sent to the receive output RX at a low level (confidence tone).
The UBA205xx has an asymmetrical DTMF input. The input impedance between pins DTMF and GND is 20 kΩ. The voltage gain from pin DTMF to pin LN is set at 26 dB at 600 Ω line load. The DC voltage between pins DTMF and GND is 0 V. So, when an external attenuator/filter network is used, there is no need for a second decoupling capacitor.
The automatic gain control has no effect on the DTMF amplifier.
RECEIVE STAGES
The receive part consists of a receive amplifier and an earpiece amplifier.
Receive amplifier (pins IR and RX)
The receive amplifier transfers the received signal from input IR to output RX. The input impedance between pins IR and GND is 20 kΩ.
The voltage gain from pin IR to pin RX is fixed at 33.4 dB. The RX output is intended to drive high ohmic (real) loads.
Automatic gain control is provided on the receive amplifier.
2000 May 19 |
12 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
Earpiece amplifier (pins GAR and QR)
The earpiece amplifier is an operational amplifier having its output QR and inverting input GAR available. It can be used in conjunction with two resistors to get some extra gain or attenuation.
Arrangements of the receive and earpiece amplifier are illustrated in Fig.13. Earpiece connections are shown in Fig.14.
In the basic configuration (see Fig.13), output RX drives the earpiece amplifier by means of RE1 connected between pins RX and the inverting input GAR. Feedback resistor RGAR of the earpiece amplifier is connected between pins QR and GAR. Output QR drives the earpiece via a series capacitor Cear.
The gain of the earpiece amplifier (from RX to QR) can be
set between +12 and -14 dB by means of resistor RGAR. The preferred value of RE1 is 100 kW.
The earpiece amplifier offers a gain boost facility relative
to the initial gain. Resistor RGAR has to be replaced by the network of RGAR1, RGAR2 and Rgb and a series capacitor Cgb as shown in Fig.13.
VQR |
æRGAR1 + RGAR2ö |
||
The initial gain is defined by: ---------- |
= – |
---------------------------------------R E1 |
ø |
VRX |
è |
||
which corresponds to Rgb = ¥.
The gain boost is realised by a defined value of Rgb and is defined by:
|
|
|
|
æ |
RGAR1 |
´ RGAR2 |
|
VQR |
æRGAR1 + RGAR2ö |
-----------------------------------------ö |
|||||
ç |
RGAR1 |
+ RGAR2÷ |
|||||
----------VRX |
= – |
---------------------------------------R E1 |
ø |
´ ç1 + |
-----------------------------------------Rgb |
÷ |
|
è |
ç |
÷ |
|||||
|
|
|
|
è |
|
|
ø |
External capacitors CGAR (connected between pins
QR and GAR) and CGARS (connected between pins GAR and GND) ensure stability. The capacitor CGAR provides a
first-order low-pass filter. The cut-off frequency corresponds to the time constant CGAR ´ RGAR. The value
of CGARS must be 10 times the value of CGAR to ensure stability.
The output voltages of the earpiece amplifier and the DTMF amplifier are specified for continuous wave drive. The maximum output voltage swing depends on the DC line voltage VLN, the DC resistance RCC of the set-impedance network between pins LN and VCC, the
current consumption ICC and IP from pin VCC and the load impedance at pin QR.
|
|
|
|
|
|
Cear |
|
|
|
I |
Rline |
RCC |
|
|
|
earpiece |
|
|
|
line |
|
|
|
CGARS |
|
|
|
|
|
|
RGAR |
RE1 |
|
|
|
|
|
|
|
|
|
|
||
|
|
|
ICC |
CGAR |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
LN |
VCC |
QR |
GAR |
RX |
|
|
Rexch |
|
|
|
|
CVCC |
|
|
|
|
EARPIECE |
|
|
100 μF |
|
|
||
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
AMPLIFIER |
|
|
|
|
|
|
|
|
|
|
|
Rgb |
|
|
|
|
|
|
|
|
|
CGARS |
|
|
|
|
|
|
|
Cgb |
|
|
V |
exch |
|
0.5VCC |
|
RGAR2 |
RGAR1 |
RE1 |
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
||
|
|
UBA205xx |
GND |
|
|
|
CGAR |
|
|
|
|
|
|
|
QR |
GAR |
RX |
|
|
|
|
|
|
Addition for gain boost of earpiece amplifier |
||
|
|
|
|
|
|
|
|
FCA133 |
Fig.13 Receive and earpiece amplifier configuration.
2000 May 19 |
13 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
|
|
(1) |
|
(2) |
|
|
|
|
|
||||||||
QR |
|
|
|
|
QR |
|
|
|
|
QR |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
GND |
|
|
|
GND |
|
GND |
|
|
|
|
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
|||||||
|
|
|
|
|
|
|
|
|
|
|
|||||||
|
|
|
|
|
|
|
|
||||||||||
MGT051
a. Dynamic earpiece. |
b. Magnetic earpiece. |
c. Piezoelectric earpiece. |
(1)This resistor may be connected to prevent distortion due to the inductive load.
(2)This resistor is required to increase the phase margin due to the capacitive load.
Fig.14 Earpiece connections.
2000 May 19 |
14 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
AUTOMATIC GAIN CONTROL (PIN AGC)
The UBA205xx performs automatic line loss compensation. The automatic gain control varies the gain of the microphone amplifier and the gain of the receive amplifier in accordance with the DC line current.
The control range is 6.0 dB. This corresponds approximately to the loss for a cable length of 5 km with an 0.5 mm diameter twisted copper-pair, a DC resistance of 176 Ω/km and an average attenuation of 1.2 dB/km).
The IC can be used with different configurations of exchange supply voltage and feeding bridge resistance by connecting an external resistor RAGC between pins AGC
and GND (see Fig.15). This resistor enables the Istart and Istop line currents to be increased (the ratio between Istart and Istop is not affected by the resistor).
The AGC function is disabled when pin AGC is left open-circuit.
0 |
|
|
|
|
|
RAGC = ∞ |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Gv |
|
|
|
|
|
|
|
|
|
|
(dB) |
|
|
|
|
|
|
|
|
|
|
−2 |
|
|
|
|
|
|
|
|
|
|
−4 |
|
|
|
|
|
|
|
|
|
|
−6 |
|
|
|
|
|
0 |
10 |
20 |
30 kΩ |
|
|
|
|
|
|
|
|
|
|
|
|
0 |
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
|
|
|
|
|
|
|
|
Iline |
(mA) |
MGT049 |
|
|
|
|
|
|
|
|
|
|
|
Fig.15 Variation of gain as a function of line current with RAGC as parameter.
2000 May 19 |
15 |
Philips Semiconductors |
Product specification |
|
|
One-chip telephone ICs with speech,
UBA2050(A); UBA2051(A;C)
dialler and ringer functions
SIDETONE SUPPRESSION
The anti-sidetone network for the UBA205xx, comprising
RCC in parallel with Zline, Rast1, Rast2, Rast3, RSLPE and Zbal (see Fig.16), suppresses the transmitted signal in the
earpiece. Maximum compensation is obtained when the following conditions are fulfilled:
RSLPE × Rast1 = RCC × (Rast2 + Rast3)
Rast2 × (Rast3 + RSLPE)
k = -----------------------------------------------------------
Rast1 × RSLPE
Zbal = k × Zline
The scale factor k is chosen to meet the compatibility with a standard capacitor from the E6 or E12 range for Zbal.
In practice, Zline varies considerably with the line type and the line length. Therefore, the value of Zbal should be
chosen for an average line length, which gives satisfactory sidetone suppression with short and long lines.
The suppression also depends on the accuracy of the match between Zbal and the impedance of the average line.
The anti-sidetone network for the UBA205xx attenuates the received signal from the line by 32 dB before it enters the receive stage. The attenuation is almost constant over the whole audio frequency range.
A Wheatstone bridge configuration (see Fig.17) may also be used.
More information on the balancing of an anti-sidetone bridge can be obtained in our publication “Application Handbook for Wired Telecom Systems, IC03b”.
|
LN |
RCC |
Rast1 |
Zline |
|
GND |
IR |
Im |
Zir
Rast2
RSLPE
Rast3
SLPE Zbal
MGT046
Fig.16 Equivalent circuit of UBA205xx anti-sidetone bridge.
2000 May 19 |
16 |
Loading...