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參數資料
| 型號： | UBA2051AT |
| 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： | 10/52頁 |
| 文件大小： | 292K |
| 代理商： | UBA2051AT |
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2000 May 19
10
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
handbook, halfpage
0
2
1
0
1
2
4
3
MGL827
IP
(mA)
VCC (V)
(2)
(1)
1.9 mA
1.6 mA
Fig.8
Typical current I
P
available from V
CC
for
peripheral circuitry.
V
CC
≥
2.5 V; V
LN
= 4.35 V at I
line
= 15 mA; R
CC
= 619
;
R
SLPE
= 20
.
(1) This curve is valid when the receiving amplifier is not loaded.
(2) This curve is valid when the receiving amplifier is loaded;
V
o(rms)
= 150 mV; R
L
= 150
.
handbook, halfpage
FCA130
Irec
PERIPHERAL
CIRCUITS
IP
GND
VCC
VCC0
RCC
Fig.9
V
CC
used as supply voltage for peripheral
circuits.
Regulated supply point (pin V
DD
)
The V
DD
regulator delivers a stabilized voltage to supply
the internal dialler and ringer parts and peripheral circuits
in transmission mode (nominal V
LN
) and in ringer mode
(V
LN
= 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 V
DD
output stabilizer
(pin V
DD
). V
DD
is decoupled by capacitor C
VDD
.
Theregulatorfunctiondependsonthetransmission,ringer
and trickle modes as follows:
Transmissionmode:Theregulatoroperatesasacurrent
source at the LN input; it takes a constant current of
I
SUP
= 4.5 mA (at nominal conditions) from pin LN.
The current switch reduces the distortion on the line at
large signal swings.
Output V
DD
follows the DC voltage at pin LN (with
typically 0.35 V difference) up to V
DD
= 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 V
DD
stabilizer.
Ringer mode: The regulator operates as a shunt
stabilizer to keep V
DD
at 3.3 V. The input voltage
V
LN
equals 0 V while the input current into pin V
DD
is
delivered by the ringing signal.
Trickle mode: When V
DD
is below typically 2 V, the
regulator is inhibited. The current consumption of the
V
DD
regulator in trickle mode is very low to save most of
the trickle current for memory retention of the dialler and
ringer parts.
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