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부품번호 | PBL388121SOT 기능 |
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기능 | Voice-switch circuit for Handsfree speakerphone TAM | ||
제조업체 | Ericsson | ||
로고 | |||
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
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=100kΩ
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
4페이지 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)
7
7페이지 | |||
구 성 | 총 10 페이지수 | ||
다운로드 | [ PBL388121SOT.PDF 데이터시트 ] |
당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는 |
구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
PBL388121SO | Voice-switch circuit for Handsfree speakerphone TAM | Ericsson |
PBL388121SOT | Voice-switch circuit for Handsfree speakerphone TAM | Ericsson |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |