Datasheet.kr   

L3281AB 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 L3281AB은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 L3281AB 자료 제공

부품번호 L3281AB 기능
기능 LOW VOLTAGE TELEPHONE SPEECH CIRCUITS
제조업체 STMicroelectronics
로고 STMicroelectronics 로고


L3281AB 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




전체 10 페이지수

미리보기를 사용할 수 없습니다

L3281AB 데이터시트, 핀배열, 회로
L3281
LOW VOLTAGE TELEPHONE SPEECH CIRCUITS
PRELIMINARY DATA
OPERATION DOWN TO 1.6V / 6.5mA
DTMF & BEEP TONE INPUTS
EXTERNAL MUTING FOR EARPHONE AND
MICROPHONE
SUITABLE FOR DYNAMIC EARPHONE AND
DYNAMIC OR ELECTRET MICROPHONE
AGC CONTROL ON BOTH SENDING AND
RECEIVING
DIP14
SO14
DESCRIPTION
The L3281 is an electronic speech circuit devel-
oped to replace hybrid circuits in telephone sets
that can be operated in parallel with other
phones.
BLOCK DIAGRAM
ORDERING NUMBERS:
L3281AB
L3281AD1
June 1993
1/10
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.




L3281AB pdf, 반도체, 판매, 대치품
L3281
ELECTRICAL CHARACTERISTICS IL = 20 to 100mA; R4 =( 51// diode) + 33;
T = 25°C; f = 1kHz; Unless Otherwise Specified
Symbol
Vl
Parameter
Line Voltage
CMRR
Gtx
DGtx
THDtx
Ntx
Zml
Grx
DGrx
THDrx
Common Mode Rej. Ratio
Sending Gain
Delta Sending Gain
Sending Distortion
Sending Noise
Mic. Input Impedance
Receiving Gain
Delta Receiving Gain
Receiving Distortion
Nrx
Zro
Zm
Vso
Iro
MUlo
MUhl
Gmf
Rmf
THDmf
Gbeep
Rbeep
THDbeep
Vz
Ileak
Receiving Noise
Rec. Output Impedance
Sidetone
Line Match. Impedance
Sending Output Voltage
Receiving Output Current
Mute Input Low
Mute Input Open
DTMF Gain
DTMF Input Impedance
DTMF Distortion
Beeptone Gain
Beeptone Input Impedance
Beeptone Distortion
Zener Voltage (Pin 5)
Leakage Current,Vpin5 = 3V
Test Condition
IL = 6.5mA
IL = 20mA
IL = 50mA
IL = 80mA
Vmi = 10mV; IL = 20mA
Vmi = 10mV; IL = 70mA
Vso = 700mV; IL = 20mA
Vmi = 0V; IL = 50mA
Vmi = 10mV
IL = 20mA; Vri = 0.2V
IL = 70mA; Vri = 0.2V
Vro = 350mV; Load = 350
Vro = 300mV; IL = 10 mA
Vri = 0V
Load = 200; Vro = 50V
Vmi = 10mV
Vri = 0.2V
IL = 6.5mA; THD = 5%
IL = 6.5mA; THD = 5%
Dialing Mode
Speaking Mode
Vmf IN = 10mV
Vmf LN = 140mV
Vbeep IN = 25mV
Vbeep IN = 100mV; IL = 20mA
Iz = 1 mA
Min.
50
30
– 7.2
Typ.
1.65
3.4
6.0
8
31.5
–5.7
40
– 10.7
– 7.2
– 70
– 9.2
– 5.7
100
10
10
500 600
100
0.5
50
14.5 16
5 10
8.5
5.5 8
0.5
4.2 5.1
20
Max.
3.7
6.5
9.5
33
–4.2
5
– 7.7
– 4.2
5
5
20
700
100
1
17.5
5
5
6.2
Unit
V
V
V
V
dB
dB
dB
%
dB
k
dB
dB
%
%
µV
dB
mV
mAp
µA
µA
dB
k
%
dB
k
%
V
µA
4/10

4페이지










L3281AB 전자부품, 판매, 대치품
AC CHARACTERISTIC
The AC Impedance measured at line terminals is
equal to:
Zm
=
(R1
+
1
jwC1
)
/
/
(
R2 +
R3
+
Zb
)
The value of the capacitor C1 must be In the
range of 22 µF to 100 µF.
The external resistor R1 can be replaced by a re-
sistor/capacitor network in order to realize a com-
plex Impedance Zm.
TRANSMITTING CIRCUIT
The first block of the TX stage is basically a differ-
ential amplifier which converts voltage to current.
The inputs are internally polarized at 300 mVdc.
The differential Input impedance is 60 Kto allow
Figure 8: Equivalent Transmitting Circuit.
L3281
a good matching to microphone. The AGC in TX
is function of voltage at pin 14 in order to de-
crease to max gain of 5.5dB to 6.0dB when the
line current increases.
RECEIVING CIRCUIT
Fig.9 shows the equivalent receiving circuit. The
differential input of RX signal across R2+R3 is
transferred to the AGC block when the mute sig-
nal (pin 10) is not active.
The AGC in RX is a function of the voltage at pin
14 and decreases the gain when the line current
increases (5.5dB to 6.0dB).
The final stage is a single ended amplifier with
low output impedance optimized to drive mag-
netic/dynamic transducers.
Figure 9: Equivalent Receiving Circuit.
7/10

7페이지


구       성 총 10 페이지수
다운로드[ L3281AB.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


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 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
L3281AB

LOW VOLTAGE TELEPHONE SPEECH CIRCUITS

STMicroelectronics
STMicroelectronics
L3281AD1

LOW VOLTAGE TELEPHONE SPEECH CIRCUITS

STMicroelectronics
STMicroelectronics

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵