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參數資料
| 型號： | UBA2051C |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | One-chip telephone ICs with speech, dialler and ringer functions |
| 中文描述： | 一個有語言，撥號及振鈴電話集成電路芯片的功能 |
| 文件頁數： | 13/52頁 |
| 文件大小： | 292K |
| 代理商： | UBA2051C |
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2000 May 19
13
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
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 R
E1
connected
between pins RX and the inverting input GAR. Feedback
resistor R
GAR
of the earpiece amplifier is connected
between pins QR and GAR. Output QR drives the
earpiece via a series capacitor C
ear
.
The gain of the earpiece amplifier (from RX to QR) can be
set between +12 and
14 dB by means of resistor R
GAR
.
The preferred value of R
E1
is 100 k
.
The earpiece amplifier offers a gain boost facility relative
to the initial gain. Resistor R
GAR
has to be replaced by the
network of R
GAR1
, R
GAR2
and R
gb
and a series capacitor
C
gb
as shown in Fig.13.
The initial gain is defined by:
which corresponds to R
gb
=
∞
.
The gain boost is realised by a defined value of R
gb
and is
defined by:
External capacitors C
GAR
(connected between pins
QR and GAR) and C
GARS
(connected between pins GAR
and GND) ensure stability. The capacitor C
GAR
provides a
first-order low-pass filter. The cut-off frequency
corresponds to the time constant C
GAR
×
R
GAR
. The value
of C
GARS
must be 10 times the value of C
GAR
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 V
LN
, the DC resistance R
CC
of the
set-impedance network between pins LN and V
CC
, the
current consumption I
CC
and I
P
from pin V
CC
and the load
impedance at pin QR.
V
RX
V
R
---------------------------------------
R
R
E1
–
=
V
RX
V
R
---------------------------------------
R
R
E1
1
R
---------------R
R
GAR2
R
gb
×
+
R
+
×
–
=
handbook, full pagewidth
Iline
Rline
VCC
GND
0.5VCC
QR
LN
GAR
CGAR
CGAR
RX
FCA133
CVCC
100
μ
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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