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參數(shù)資料
| 型號： | L3281AD1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LOW VOLTAGE TELEPHONE SPEECH CIRCUITS |
| 中文描述： | 低壓電話語音電路 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 170K |
| 代理商： | L3281AD1 |
ELECTRICALCHARACTERISTICS
I
L
= 20 to 100mA;R4 =(51
// diode) + 33
;
T = 25
°
C; f =1kHz; Unless OtherwiseSpecified
Symbol
V
l
Parameter
Test Condition
Min.
Typ.
1.65
3.4
6.0
8
Max.
Unit
V
V
V
V
dB
dB
dB
%
dB
k
dB
dB
%
%
μ
V
dB
mV
mAp
μ
A
μ
A
dB
k
%
dB
k
%
V
μ
A
Line Voltage
I
L
= 6.5mA
I
L
= 20mA
I
L
= 50mA
I
L
= 80mA
3.7
6.5
9.5
CMRR
G
tx
DG
tx
THD
tx
N
tx
Z
ml
G
rx
DG
rx
THD
rx
Common Mode Rej. Ratio
Sending Gain
Delta Sending Gain
Sending Distortion
Sending Noise
Mic. Input Impedance
Receiving Gain
Delta Receiving Gain
Receiving Distortion
50
30
V
mi
= 10mV; I
L
= 20mA
V
mi
= 10mV; I
L
= 70mA
V
so
= 700mV; I
L
= 20mA
V
mi
= 0V; I
L
= 50mA
V
mi
= 10mV
I
L
= 20mA; V
ri
= 0.2V
I
L
= 70mA; V
ri
= 0.2V
V
ro
= 350mV; Load = 350
V
ro
= 300mV; I
L
= 10 mA
V
ri
= 0V
Load = 200
; V
ro
= 50V
V
mi
= 10mV
V
ri
= 0.2V
I
L
= 6.5mA; THD = 5%
I
L
= 6.5mA; THD = 5%
Dialing Mode
Speaking Mode
V
mf IN
= 10mV
31.5
–5.7
33
–4.2
5
– 7.2
– 70
40
– 10.7
– 7.2
– 9.2
– 5.7
– 7.7
– 4.2
5
5
N
rx
Z
ro
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,V
pin5
= 3V
100
10
10
600
20
700
Z
m
V
so
I
ro
MU
lo
MU
hl
G
mf
R
mf
THD
mf
G
beep
R
beep
THD
beep
V
z
I
leak
500
100
0.5
50
100
1
17.5
14.5
5
16
10
V
mf LN
= 140mV
V
beep IN
= 25mV
5
8.5
8
0.5
5.1
20
5.5
V
beep IN
= 100mV; I
L
= 20mA
I
z
= 1 mA
5
4.2
6.2
L3281
4/10
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