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PBL38814 데이터시트 PDF




Ericsson에서 제조한 전자 부품 PBL38814은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 PBL38814 기능
기능 Voice - switched 2-channel Circuit with loudspeaker amplifier
제조업체 Ericsson
로고 Ericsson 로고


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PBL38814 데이터시트, 핀배열, 회로
PRELIMINARY
May 1998
PBL 388 14
Voice - switched 2-channel Circuit with
loudspeaker amplifier
Description.
Key Features
The PBL 388 14 contains all the necessary circuitry, amplifiers, detectors,
comparator and control functions to implement a high performance voice switched
handsfree two- way communication system. The gain dynamics (attenuation between
channels) is selectable (25dB or 50dB) via a separate pin. A background noise
detector in the transmitting channel reduces the influence of continuous external noise
signals to the switching .
The PBL 388 14 is designed for mains powered handsfree telephones, vehicular
mobile telephone handsfree systems and handsfree intercom systems. Automatic
volume attenuation in the power amplifier extends the operating range at low supply
currents. The circuit has two special features, the power amplifiers volume control can
be implemented either as an ac. potentiometer control or as a digital control by a µ-
processor (dc. control) and that the feedback loop of the power amplifier is accessible
thus making it possible to add a simple external power stage driving low impedance
loudspeakers up to several watts.
Filtering is possible of both, the audio and the speech switching control signals,
in both transmitter and receiver channels.
Minimum of external components
needed for function.
Selectable gain dynamics. (25 or 50
dB)
Low power consumption: 1mA at 3.3V
(typical) for speech switching, audio
power amplifier quiscent current 1mA.
Drives an 25 - 50 ohm loudspeaker
without a transformer.
Background noise compensation in the
transmitting channel with hold function
at receive.
18 19 21 22 20
• Input amplifiers of both channels have
balanced inputs.
• Exellent noise performance.
23 • Encapsulated in 24 pin plastic ”skinny”
DIP and 24 pin SO .
4
24
16 +
F3
3
5
PBL 388 14
Control
17
12
F6
13
11
24 pin SO
F2
1
2
F1
+
8
F5
Ref.
6 9 10 7
15
F4
+
14
24 pin DIP
Figure 1. Block diagram.
1




PBL38814 pdf, 반도체, 판매, 대치품
PBL 388 14
Parameter
NDet leakage current (hold), INDet
Ref.
fig.
2
NDet swing relative to VRef , VNDet
2
CMP (comparator) sensitivity,
transmit (Tx) mode to receive
(Rx) mode or vice versa
CTR voltage for 25 dB dynamics, VCTR
CTR voltage for mute, VCTR
CTR voltage for disable, V
CTR
Loudspeaker amplifier
Operating voltage, VA
Current consumption (no signal), I+L
Current consumption
(output swing at 5% dist.)
Swing at 5% dist., VOut
Gain
Frequency response
Amplifier power efficiency (5% dist), n
2
12
2,14
2,14
2,14
3
3
3
3
3
3
3
3
3
3
3
3
3
Input impedance pin 23
3
Conditions
VTxDetIn = VRef - 0.1 V,
VCMP = VRef + 0.1 V,
VTxDetIn = VRef + 0.1 V,
V = V - 0.1 V
CMP
Ref
Tx mode = max Tx gain,
Rx mode = max Rx gain
RCTR=100k
VA = 3.0 V
VA = 5.0 V
VA = 12.0 V
VA = 3.0 V
V = 5.0 V
A
VA = 12.0 V
VA = 3.0 V
VA = 5.0 V
VA =12.0 V
VA =5.0 V, IVOL = 0
200 to 3400 Hz, relative 1kHz,
V = 3.0 to 12.0 V,
A
n = 100 PLoad/PSupply
Notes
1.
20 • 10log (
VNDet - VRef
VTxDet - VTxDetO
)
VNDet = voltage at noise detector output
V = reference voltage (about 2 V) see figure 2.
Ref
VTxDet = Voltage at transmit detector output.
VTxDetO= voltage at transmit detector output at the point
when the voltage at the noise detector starts
moving when a signal at transmit channel input is
gradually increased (threshold, typical value 30 mV)
2. Depends on V+. Channels are tracking.
Min.
Typ.
Max.
Unit.
-100
nA
0.45 V
40 80
mV
1.1
2.5
0.6
1.5
3.6
34.5
-1
24
V+
1.6
0.9
12
1 2.3
2
49
7
13
30
0.85
1.7
4.0
36.5 38.5
1
40
30 36
V
V
V
V
mA
mA
mA
mA
mA
mA
Vp
Vp
Vp
dB
dB
%
k
4

4페이지










PBL38814 전자부품, 판매, 대치품
Figure 7. Transmitter channel input
amplifier used to suppress ripple in the
mic. supply. (CMRR).
R1 = R2 3k
R3 = R4 100k
R5 = R6
C1 = C2
PBL 388 14
+
R7
R6
R5
C4
C2
C1
Mic.
C3
PBL
388 14
F2
Ref.
R4 - F1+ R3
R2
1 R1
2 17
Figure 8. Transmitter and receiver
channel rectifier characteristics.
Figure 9. Relationship in timing between
the voltage levels at TxIn, TxDet and NDet
VRxDet
+600
+400
+200
V ref 1.9V Vref
-200
-400
-600
V2.5 5.0 7.5 10
Rx in
mVp
0.5 1.0 1.5 V Tx in
V TxDet
A
Txin
TxDetout
Figure 10. Transmitter and receiver
channel output dynamics.
N Det
V Txout
(mV)
500
400
300
200
100
2.4 2.6 2.8 3.0 3.2 3.4
time
V+ (V)
V Rxout
(mV)
500
400
300
200
100
2.4 2.6 2.8 3.0 3.2 3.4
V+ (V)
7

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