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參數(shù)資料
| 型號： | MC145740F |
| 廠商： | MOTOROLA INC |
| 元件分類： | 信令電路 |
| 英文描述： | Dual Tone Multiple Frequency Line Interface |
| 中文描述： | TELECOM, DTMF SIGNALING CIRCUIT, PDSO20 |
| 封裝： | SOG-20 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 141K |
| 代理商： | MC145740F |
MC145740
MOTOROLA
3
AC ELECTRICAL CHARACTERISTICS
DTMF TRANSMIT CHARACTERISTICS
(VCC = 5 V
±
10%, TA = – 20 to 70
°
C)
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Transmit Level
Low Group
Vfl
Vfh
PE
Attenuator = 0 dB
3 579545 MHz
fosc = 3.579545 MHz
VTxA1 – VTxA2
VTxA1 VTxA2
RL = 1.2 k
—
2.5
—
dBm
High Group
—
3.5
—
High Group Pre–Emphasis
0
—
3
dB
DTMF Distortion
DIST
—
5
—
%
DTMF Frequency Variation
fV
– 1
—
1
%
Out–of–Band Energy
(See Figure 1)
VOE
—
—
—
Setup Time
tosc
—
4
—
ms
TRANSMIT ATTENUATOR CHARACTERISTICS
(VCC = 5 V
±
10%, TA = – 20 to 70
°
C)
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Attenuator Range
ARNG
0
—
15
dB
Attenuator Accuracy
AACC
1 dB – 5 dB
– 0.5
—
0.5
dB
6 dB – 9 dB
– 1
—
1
10 dB – 15 dB
– 1.7
—
1
DTMF RECEIVER CHARACTERISTICS
(VCC = 5 V
±
10%, TA = – 20 to 70
°
C)
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Input Impedance
RIDTMF
50
—
—
k
Detect Signal Level (Each Tone)
– 48
—
0
dBm
Twist (High Group/Low Group)
– 10
—
10
dB
Frequency Detect Band Width
See Figure 3
±
1.5%
±
2 Hz
—
—
% fc
Frequency Reject Band Width
—
—
±
3.5
DTMF Detect Timing
(See Figure 2)
OFF to ON
TVDON
CD1 = 0, CD0 = 1
—
20
—
ms
CD1 = 1, CD0 = 0
—
30
—
CD1 = 1, CD0 = 1
—
40
—
ON to OFF
TVDOFF
CD1 = 0, CD0 = 1
—
20
—
CD1 = 1, CD0 = 0
—
30
—
CD1 = 1, CD0 = 1
—
20
—
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