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參數(shù)資料
| 型號： | 935260687118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELEPHONE MULTIFUNCTION CKT, PDSO28 |
| 封裝： | PLASTIC, SOT-136, SO-28 |
| 文件頁數(shù)： | 5/56頁 |
| 文件大?。?/td> | 360K |
| 代理商： | 935260687118 |
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2000 May 19
13
Philips Semiconductors
Product specication
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
Earpiece amplier (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 k.
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.
The initial gain is defined by:
which corresponds to Rgb = ∞.
The gain boost is realised by a defined value of Rgb and is
defined by:
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.
V
QR
V
RX
----------
R
GAR1
R
+
R
E1
----------------------------------------
–
=
V
QR
V
RX
----------
R
GAR1
R
GAR2
+
R
E1
----------------------------------------
1
R
GAR1
R
GAR2
×
R
GAR1
R
GAR2
+
------------------------------------------
R
gb
------------------------------------------
+
×
–
=
handbook, full pagewidth
Iline
Rline
VCC
GND
0.5VCC
QR
LN
GAR
CGAR
RX
FCA133
CVCC
100
F
EARPIECE
AMPLIFIER
UBA205xx
RCC
RGAR
RE1
ICC
RGAR1
RE1
RGAR2
Rgb
Cgb
RX
GAR
QR
Addition for gain boost of earpiece amplifier
CGARS
Rexch
Vexch
CGARS
Cear
earpiece
Fig.13 Receive and earpiece amplifier configuration.
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