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參數(shù)資料
| 型號： | 935260607112 |
| 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)： | 4/56頁 |
| 文件大小： | 360K |
| 代理商： | 935260607112 |
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2000 May 19
12
Philips Semiconductors
Product specication
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
TRANSMIT STAGES
Microphone signal amplication (pins MIC+ and MIC
)
The UBA205xx has symmetrical microphone inputs. The
input impedance between pins MIC+ and MIC
is 64 k
(2
× 32 k).
In speech mode, the voltage gain from pins MIC+ and
MIC
to pin LN is set at 44.2 dB at 600 line load.
Microphone arrangements are illustrated in Fig.12.
Automatic gain control is provided on this amplifier for line
loss compensation.
handbook, full pagewidth
MGT052
GND
VCC
(1)
MIC
MIC
+
MIC
MIC
+
MIC
MIC
+
(2)
Fig.12 Microphone arrangements.
a. Magnetic or dynamic microphone.
b. Electret microphone.
c. Piezoelectric microphone.
(1) This resistor may be connected to reduce the terminating impedance.
(2) Extra decoupling capacitor for the microphone supply.
DTMF amplication (pin DTMF)
When the DTMF amplifier is enabled, dialling tones may
be sent on the line. These tones are generated at
pin MDY/TONE and their amplitude can be adjusted by
means of an attenuator and filter network (see Fig.35)
before being applied to the DTMF amplifier at pin DTMF.
These tones are also sent to the receive output RX at a low
level (confidence tone).
The UBA205xx has an asymmetrical DTMF input. The
input impedance between pins DTMF and GND is 20 k
.
The voltage gain from pin DTMF to pin LN is set at 26 dB
at 600
line load. The DC voltage between pins DTMF
and GND is 0 V. So, when an external attenuator/filter
network is used, there is no need for a second decoupling
capacitor.
The automatic gain control has no effect on the DTMF
amplifier.
RECEIVE STAGES
The receive part consists of a receive amplifier and an
earpiece amplifier.
Receive amplier (pins IR and RX)
The receive amplifier transfers the received signal from
input IR to output RX. The input impedance between
pins IR and GND is 20 k
.
The voltage gain from pin IR to pin RX is fixed at 33.4 dB.
The RX output is intended to drive high ohmic (real) loads.
Automatic gain control is provided on the receive amplifier.
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