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PBL388121SOT 데이터시트 PDF




Ericsson에서 제조한 전자 부품 PBL388121SOT은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 PBL388121SOT 기능
기능 Voice-switch circuit for Handsfree speakerphone TAM
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PBL388121SOT 데이터시트, 핀배열, 회로
OPcBtoLbe3r81899192
PBL 388 12
Voice-switch circuit for
Handsfree speakerphone TAM
Description
Key Features
The PBL 388 12 contains all the necessary circuitry, amplifiers, detectors, comparators
and control functions to implement a high performance, voice-switched, ”hands-free ”
function in an answering machine. The gain dynamics (attenuation between channels)
is settable (25dB or 50dB) via CTR pin that also control two mute levels. A background
noise detector in the transmitting channel reduces the influence of continuous noise sign-
als.
The PBL 388 12 is designed for answering machines that are either powered from the
telephone line or from a mains powered dc. supply.
Filtering of both the audio and control signals in both transmitter and receiver channels
possible.
An external loudspeaker amplifier has to be used, normally the same as used for the
answering machine.
All figures in this paper refer to 16-pin SO package.
• Settable gain dynamics (25 or 50
dB).
• Low power consumption, totally
1.0mA at 3.3V typical.
• Background noise compensation in
the transmitting channel with hold
function.
• Exellent noise performance.
• Both channel input amplifiers have
balanced inputs.
• Minimum of external components
needed for function.
• 16-pin SO and 18-pin DIP
encapsulation.
1
5
F3
4
6
15 +
F2
PBL 388 12
Control
F6
12
16
13
11
F5
16-pin SO
2
3
F1
+
8
Ref.
7 9 10
Figure 1. Block diagram. ( SO - package )
F4 + 14
18-pin DIP
1




PBL388121SOT pdf, 반도체, 판매, 대치품
PBL 388 12
Parameter
NDet leakage current (hold), INDet
NDet swing relative to VRef , VNDet
CMP (comparator) sensitivity,
transmit (Tx) mode to receive
(Rx) mode or vice versa
CTR voltage for 25 dB dynamics, VCTR
CTR voltage for mute, ICTR
CTR voltage for disable, VCTR
Ref.
fig.
3
3
3
13
Conditions
VTxDetIn = VRef - 0.1 V,
VCMP = VRef + 0.1 V,
VCMP = VRef - 0.1 V,
VTxDetIn = VRef + 0.1 V
Tx mode = max Tx gain,
Rx mode = max Rx gain
3 VCMP = VRef ± 0.35 V, RCTR=100k
3 VCMP = VRef ± 0.35 V
3
Notes:
1.
20 • 10log (
VNDet - VRef
VTxDet - VTxDetO
)
VNDet = voltage at noise detector output
VRef = reference voltage (about 1.9 V) see figure 2.
V = Voltage at transmit detector output.
TxDet
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.
-100
Max.
-0.45
50 100
Unit.
nA
V
mV
V+ V
µA
0.55 V
4

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PBL388121SOT 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 12
+
R7
R6
R5
C4
C2
C1
Mic.
C3
F2
Ref.
R4 - F1+ R3
R2
2 R1
3 16
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 2V 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
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
V+ (V)
V Rxout
(mV)
500
400
300
200
100
2.4 2.6 2.8 3.0 3.2 3.4
V+ (V)
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관련 데이터시트

부품번호상세설명 및 기능제조사
PBL388121SO

Voice-switch circuit for Handsfree speakerphone TAM

Ericsson
Ericsson
PBL388121SOT

Voice-switch circuit for Handsfree speakerphone TAM

Ericsson
Ericsson

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