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參數(shù)資料
| 型號： | PBL38570 |
| 廠商： | ERICSSON |
| 英文描述： | Universal Speech Circuit |
| 中文描述： | 通用語音電路 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 238K |
| 代理商： | PBL38570 |
PBL 385 70
11
The circuit has further two temperature
and line current compensated DC supplies
DC1 and DC2. DC1 is a voltage supply for
supplying diallers, can also be used for
memory back up because it does not leak
any current back into the circuit. Typical
voltage 2.4V down to line voltage of 4.1V,
in case the line voltage is lower than 4.1V
calculate ; actual line voltage minus 1.9V.
In order to prevent noise entering the line,
a series resistor and a reservoir capaciotor
is recommended in series at this output.The
output current is given to be 2 mA in the
specification. In case this would not be
enough the current capability can be
increased by connecting the outputs of
DC1 and DC2 in parallel. The driving capa-
city will increase almost to the double but
the voltage drop across the necessary
series resistor will go upp thus limiting the
useful current.
The voltage level that is common for
both of these supplies is set by DC2. DC2
is a high precision, reference quality supply
that can be used to supply microphones,
opto couplers etc. The internally set voltage
can be adjusted with external resitors when
needed (R
DC1
and R
DC2
).
The fourth DC-supply VPA has an
advantage that it does not influence the
circuits DC characteristics even at high
current drain. The supply has a floating
ground reference in the plus line in order to
minimize RFI problems and is used to
supply the power amplifier of a handsfree
telephone ( PBL3881, 38811---14 ). These
circuits have a current controlled charging
of the supply capacitor and the control
signal is taken across the resistor R6. In
case a monitor amplifier is required where
the ground reference is hardly necessary,
it can be supplied from VPA or like in alt. b
in fig. 17.
17
14
2
3
11
12
13
18
16
AM
AT
AR
15
4
+
10
AD
1
PBL 385 70
7
9
+
6
5
8
DC-supply
+
47
μ
F
*
*
18k
22k
100n
75
910
560
11k
100n
6.2k
11k
10
62k
47
μ
F
15n
910
47n
1-10M
MIC.
1
μ
F
220
220
CMOS
DIALLER
1
2
3
4
5
6
7
8
9
0
#
*
DTMF 12
MUTE 9
VDD
GND
47
μ
F
100
Voltage
adjust
100
Hook switch
Telephone line
10
+
1
μ
F
10n
100
Rec.
3.3n
680p
33k
15V
Figure 17. DC-supplies
Figure 18. Typical DTMF tone dialling telephone. 18-pin DIP package. * marked components for gain regulation.
+
R
Feed
R
Line
I
L
1
Hook
switch
PBL 38 570
Lim
+
V
T
+
-
3
2
4
+Line
+
+
-Line
C1
R3
R6
V
Mon.
+
+
-
15k
15k
4.7-47
μ
F
8
0-470
1-10M
V
DC1
V
DC2
Ref.
7
14
R
DC1
R
DC2
0-470
+
4.7-47
μ
F
9
V
PA
+
a.
b.
V
L
V
exh.
a. Supply arrangement for a handsfree system power amplifier. For ex. PBL 38811---14
b. Supply arrangement for a call monitor cicuit.
V
+C
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PBL385701N | Universal Speech Circuit |
| PBL385701SO | Universal Speech Circuit |
| PBL385711SOS | High current Speech and Line interface Circuit |
| PBL38571 | High current Speech and Line interface Circuit |
| PBL385711NS | High current Speech and Line interface Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PBL385701N | 制造商:ERICSSON 制造商全稱:Ericsson 功能描述:Universal Speech Circuit |
| PBL385701SO | 制造商:ERICSSON 制造商全稱:Ericsson 功能描述:Universal Speech Circuit |
| PBL385701SOT | 制造商:ERICSSON 制造商全稱:Ericsson 功能描述:Universal Speech Circuit |
| PBL38571 | 制造商:ERICSSON 制造商全稱:Ericsson 功能描述:High current Speech and Line interface Circuit |
| PBL38571/1NS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm |
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