參數(shù)資料
型號(hào)： 935260607112
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 無(wú)繩電話/電話
英文描述： TELEPHONE MULTIFUNCTION CKT, PDSO28
封裝： PLASTIC, SOT-136, SO-28
文件頁(yè)數(shù)： 2/56頁(yè)
文件大?。?/td> 360K
代理商： 935260607112
2000 May 19
10
Philips Semiconductors
Product specication
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
handbook, halfpage
0
3
2
1
0
12
4
3
MGL827
IP
(mA)
VCC (V)
(2)
(1)
1.9 mA
1.6 mA
Fig.8
Typical current IP available from VCC for
peripheral circuitry.
VCC ≥ 2.5 V; VLN = 4.35 V at Iline = 15 mA; RCC = 619 ;
RSLPE =20 .
(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 .
handbook, halfpage
FCA130
Irec
PERIPHERAL
CIRCUITS
IP
GND
VCC
VCC0
RCC
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.
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