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L3281AD1 Datasheet

  • L3281AD1

  • LOW VOLTAGE TELEPHONE SPEECH CIRCUITS

  • 10頁(yè)

  • STMICROELECTRONICS   STMICROELECTRONICS

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L3281
ELECTRICAL CHARACTERISTICS
I
L
= 20 to 100mA; R4 =( 51鈩?// diode) + 33鈩?
T = 25擄C; f = 1kHz; Unless Otherwise Specified
Symbol
V
l
Parameter
Line Voltage
I
L
I
L
I
L
I
L
Test Condition
= 6.5mA
= 20mA
= 50mA
= 80mA
50
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鈩?/div>
V
ro
= 300mV; I
L
= 10 mA
V
ri
= 0V
Load = 200鈩? 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
V
mf LN
= 140mV
V
beep IN
= 25mV
5.5
V
beep IN
= 100mV; I
L
= 20mA
I
z
= 1 mA
4.2
8.5
8
0.5
5.1
20
5
6.2
14.5
5
16
10
5
500
100
0.5
50
100
1
17.5
100
10
10
600
20
700
40
鈥?10.7
鈥?7.2
鈥?9.2
鈥?5.7
鈥?7.7
鈥?4.2
5
5
鈥?70
30
鈥?7.2
31.5
鈥?.7
33
鈥?.2
5
Min.
Typ.
1.65
3.4
6.0
8
Max.
3.7
6.5
9.5
Unit
V
V
V
V
dB
dB
dB
%
dB
k鈩?/div>
dB
dB
%
%
碌V
鈩?/div>
dB
鈩?/div>
mV
mAp
碌A(chǔ)
碌A(chǔ)
dB
k鈩?/div>
%
dB
k鈩?/div>
%
V
碌A(chǔ)
CMRR
G
tx
DG
tx
THD
tx
N
tx
Z
ml
G
rx
DG
rx
THD
rx
N
rx
Z
ro
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
Common Mode Rej. Ratio
Sending Gain
Delta Sending Gain
Sending Distortion
Sending Noise
Mic. Input Impedance
Receiving Gain
Delta Receiving Gain
Receiving Distortion
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
4/10

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