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參數資料
| 型號： | UBA2051T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | One-chip telephone ICs with speech, dialler and ringer functions |
| 中文描述： | TELEPHONE MULTIFUNCTION CKT, PDSO28 |
| 封裝： | PLASTIC, SOT-136, SO-28 |
| 文件頁數： | 8/52頁 |
| 文件大小： | 292K |
| 代理商： | UBA2051T |
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2000 May 19
8
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
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
S
UPPLY
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 V
ref
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 R
VA
.
The reference voltage can be increased by connecting the
resistorR
VA
betweenpinsREGandSLPEordecreasedby
connecting the resistor R
VA
between pins REG and LN.
The voltage at pin REG is used by the internal regulator to
generate V
ref
and is decoupled by capacitor C
REG
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 (R
SLPE
) to its AC value (R
CC
in the audio
frequency range).
The voltage at pin SLPE is proportional to the line current,
and the voltage V
LN
at pin LN can be calculated as follows:
V
LN
= V
ref
+ R
SLPE
×
I
SLPE
I
SLPE
= I
line
I
CC
I
P
I
SUP
where:
I
line
= line current
I
CC
= internal current consumption
I
P
= supply current for peripheral circuits
I
SUP
= current consumed by the V
DD
regulator from
pin LN.
Resistor R
SLPE
is an external resistor connected between
pins SLPE and GND. The preferred value for R
SLPE
is
20
. Changing the value of R
SLPE
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 (V
exch
), the feeding bridge
resistance (R
exch
), the DC resistance of the telephone line
(R
line
) and the reference voltage (V
ref
). The excess current
is shunted via pin LN to pin SLPE when the line current
(I
line
) is greater than the sum of the supply current of the
speech/transmission part (I
CC
), the current drawn by the
peripheral circuitry connected to V
CC
(I
P
) and the input
currentoftheV
DD
regulator(I
SUP
).Withlinecurrentsbelow
I
low
(9 mA), the internal reference voltage (generating V
ref
)
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 I
low
, the circuit has limited sending and receiving
levels. This is called the low voltage area.
handbook, halfpage
LN
SLPE
REG
IR
AGC
DTMF
VDD
XTAL
KT
CE/CSI
CE/FDI
C4
MDY/TONE
VCC
MIC
MIC
+
RX
QR
GND
GAR
R1
R2
R3
R4
C1
C2
C3
1
2
3
4
5
6
7
8
9
10
11
12
13
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
UBA2051CT
FCA128
DP/FL
Fig.6 Pin configuration (UBA2051CT).
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