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參數(shù)資料
| 型號(hào)： | L3280AB |
| 英文描述： | Telephone Speech Circuit |
| 中文描述： | 電話語音電路 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 130K |
| 代理商： | L3280AB |
ELECTRICAL CHARACTERISTICS
(T
amb
= 25
o
C ; f = 1kHz ; I
L
= 20mA : mute low ; R1 (pin 14) = 43
, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
L
Line Voltage
I
L
= 20 mA
3.05
3.35
V
V
L
Line Voltage
I
L
= 50 mA
5.8
6.2
V
V
L
Line Voltage
I
L
= 80 mA
8.5
10
V
C
MRR
Common Mode Rej. Ratio
50
dB
G
S
Sending Gain
V
MI
= 2 mV, I
L
= 20 mA
47.8
49.3
50.8
dB
D
GS
Delta Sending Gain
I
L
= 70 mA, V
MI
= 2 mV
– 7
– 5.5
– 4
dB
T
HDS
Sending Distortion
V
SO
= 700 mV
5
%
N
TX
Sending Noise
I
L
= 50 mA, V
MI
= 0 V
– 71
dBm
Z
MI
Mic. Input Impedance
V
MI
= 2 mV
40
K
G
R
Receiving Gain
I
L
= 20 mA, V
RI
= 0.2 V
7.7
9.2
10.7
dB
D
GR
Delta Receiving Gain
I
L
= 70 mA, V
RI
= 0.2 V
– 7
– 5.5
– 4
dB
T
HDR
Receiving Distortion
V
RO
= 615 mV
5
%
N
RX
Receiving Noise
V
RI
= 0 V
300
μ
V
Z
RO
Receiving Output Imped.
R
1
= 200
, V
RO
= 50 mV
10
Sidetone
V
MI
= 2 mV
40
dB
Z
ML
Line Match. Impedance
V
RI
= 0.2 V
500
600
700
V
L
Line Voltage
I
L
= 5.5 mA
1.5
1.8
V
V
SO
Sending Output Voltage
I
L
= 5.5 mA, T
HD
= 5 %
100
mV
I
RO
Rec. Output Current
I
L
= 5.5 mA, T
HD
= 5 %
0.7
mA
OPERATION @ I
L
= 16 mA
MULO
Mute Input Low
(speaking mode)
1
V
MUHI
Mute Input High
(dialling mode)
2
V
GMF
DTMF Gain
V
in
= 2 mV ; Mute = 2 V
25
26.5
28
dB
RMF
DTMF Input Impedance
Mute = 2 V
6
8.5
K
THDMF
DTMF Distorsion
Mute = 2 V ; V
in
= 25 mV
5
%
G
beep
Beeptone Gain
Mute = 2 V ; V
in
= 25 mV
8.5
dB
R
beep
Beeptone Input Imped.
Mute = 2 V
12
K
THD
Beeptone Distorsion
Mute = 2 V ; V
Bt
= 100 mV
5
%
DV
L
DELTA V
LINE
Mute = 2 V ; I
L
= 20 mA
0.5
1.2
V
G
BACK
Back Tone Gain
–
–
–3.0
dB
L3280
4/8
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