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부품번호 | PBL385822SOT 기능 |
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기능 | Telephone Line interface circuit for DECT/ DAM/ CT Unisolated or Isolated | ||
제조업체 | Ericsson | ||
로고 | |||
DecPeBmLbe3r 81959892
PBL 38582
Telephone Line interface circuit for
DECT, DAM, CT
Unisolated or Isolated
Description
PBL 38582 is a monolithic bipolar integrated circuit for use as telephone line interface in
unisolated or isolated DECT and other cordless telephone residential base stations and
in analog / digital answering machines or as second line in an unisolated DECT telephone
base station.
Transmit and receive gains are set by external components. On / Off switchable gain,
related to line, regulation for different current feeds can be set by external resistors.
Typical current feeds as 48 V, 2 • 200 ohm, 48 V 2 • 400 ohm and 60 V 2 • 600 ohm can
be handled. Application dependent parameters such as line balance, impedance to the
line and frequency response are set by external components. Parameters are set
independently which results in an easy adoption for various market needs.
Key Features
• Minimum number of inexpensive
external components, 5 capacitors
and 4 resistors.
• Current range
5 - 130 mA(DIL),
5 - 100 mA(20-pin SO)
5 - 70 mA(16-pin SO) 385 82/2
• Operation voltage range
down to 2 V.
• Short start-up time.
RECEIVE
TRANSMIT
PBL 38582
18
1
Fast start - up
1 7 Limiter
Reference
DC
supply
6 32
+
1 5 5, 14,16 4
2
1
Figure 1. Functional diagram. DIP package.
Telephone
line
16-pin plastic SO
20-pin plastic SO
18-pin plastic DIP
1
PBL 385 82
+L 1
TO 2
TI 3
+C 4
-L 5
GR 6
NA 7
NA 8
NA 9
18 RE 2
17 RE 1
16 -L
15 RI
14 -L
13 NA
12 NA
11 NA
10 NA
18-pin DIP
+L 1
TO 2
TI 3
+C 4
-L 5
GR 6
NA 7
NA 8
NA 9
NA 10
20 RE2
19 RE1
18 -L
17 RI
16 -L
15 NA
14 NA
13 NA
12 NA
11 NA
20-pin SO
+L 1
TO 2
TI 3
+C 4
-L 5
GR 6
NA 7
NA 8
16 RE2
15 RE1
14 -L
13 RI
12 -L
11 NA
10 NA
9 NA
16-pin SO
Figure 5. Pin configuration.
Pin Descriptions
Refer to figure 5.
DIP SO 20 SO 16 Name
Function
11
1
+L Output of the transmitter amplifier. Connected to the line through a
polarity guard diode bridge.
22
2
33
44
3
4
66
6
TO Output of the transmitter amplifier. Connected through a resistor of 47 to 100 ohm to -L.
Sets the DC-charateristic of the circuit.The output has a low AC output impedance and
the signal is used to drive a side tone balancing network.
TI Input of transmit amplifier. Input impedance 17 kΩ ± 20 %.
+C The positive power supply terminal for most of the circuitry inside the PBL 385 82
(about 1 mA current consumption). The +C-pin is to be connected to a decoupling
capacitor of 47 µF to 150 µF.
GR The control input for the gain regulation in the receiver.
55
14 16
16 18
15 17
17 19
18 20
77
88
99
10 10
5
12
14
13
15
16
7
8
9
10
}-L The negative power terminal, connected to the line through a polarity guard diode
bridge.
RI Input of the receive signal amplifier. Input impedance is 38 kohm ± 20 %.
}RE2
RE1
The receive signal amplifier outputs. Output impedance is approximately 3 ohm.
NA
NA
NA
NA
11 11
12 12
11
NA
NA
13 13
NA
14 NA
15 NA
4
4페이지 PBL 385 82
Battery feed
Regulation:
48V, 2 • 200Ω
48V, 2 • 400Ω
48V, 2 • 800Ω
R13
∞
∞
∞
No regulation:
Set for low gain
All feedings
Set for high gain
Set for high gain
∞
18k
22k
R14
∞
∞
180k
R6
47Ω
75Ω
100Ω
dB
c.
b.
a.
High limit
<22k
∞
∞
47 - 100Ω
47Ω
75 - 100Ω
Low limit
Figure 9. Gain regulation principle.
IL
What is balancing the side
tone?
To understand that side tone balancing
is to counteract the signal, that is
transmitted via the microphone and trans-
mitter to the line, returning to the earphone
via the receiver.
That presence of a strong side tone
signal is disturbing in a way that one quite
instictively lowers ones own voice level
thus lowering the signal level for the other
party. But again, if the balance is too good
(seldom the case) the earphone will feel
”dead”. In practical terms what is expected
is the same amplitude of ones own voice
in the ear as when not talking in a telephone.
The need to lower the side tone level
where no balancing has been done is in
the order of 6 - 12 dB.
To understand that the side tone is
influenced by other factors like, the
impedance of the line and the signal that
enters the ear acoustically directly from the
mouth and from the mouth through the
material in the handset. The signal that
enters the microphone from the earphone
acoustically will also influence the return
loss factor to the telephone line.
To understand that the side tone network
can be trimmed to form a veritable
”distortion analyser”, so that the distortion
that is present from the microphone, will be
the only signal entering the earphone and
this signal even being small will sound very
bad. It is better to induce some of the
fundamental frequency back by making
the balance less perfect at that frequency.
This is valid for a network that is trimmed to
only one frequency. It is to strive to trim the
network such that it will attenuate the fun-
damental and the harmonic frequencies
alike throughout the different line
combinations.
To understand that if one of the two
signals entering the balancing system
from either direction, direct from
microphone or via the line, is clipped, will
result in a very distorted signal entering the
receiver amplifier and thus the earphone.
Further , to remember that side tone is a
small signal that is the difference of two
large signals and that the amplitude of the
distortion can be up to ten times the
amplitude of the fundamental frequency.
a).
1
Tx
PBL 385 82
17
Rx
2 15
b).
R7 c). R10
C4
} R11
R8
R6 Zbal R12
C5 R9
18
Figure 10. The side tone suppression principle.
Telephone
set side
Line side
Z2 Z1
A short guidance for under-
standing the side tone
principle. (See fig. 10.)
Assuming the line impedance to be 600Ω.
( theorethical value )
Z1 = Line impedance
Z2 = The telephone set impedance 600Ω
Z1//Z2 = 300Ω
R6 will have a certain value 39 - 100Ω to
give the telephone a specified DC-
characteristic and overcurrent protection.
Assuming that this DC-characteristic
requires R6=60Ω, hence it will be 1/5 of
the Z1//Z2. This will in transmitting mode
result that 1/5 of the ac-signal that is on the
line to appear across R6.
7
7페이지 | |||
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부품번호 | 상세설명 및 기능 | 제조사 |
PBL385822SOS | Telephone Line interface circuit for DECT/ DAM/ CT Unisolated or Isolated | Ericsson |
PBL385822SOT | Telephone Line interface circuit for DECT/ DAM/ CT Unisolated or Isolated | Ericsson |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |