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參數(shù)資料
| 型號： | MC145446 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Single-Chip 300-Baud Modem with DTMF Transceiver |
| 中文描述： | 單芯片300波特調(diào)制解調(diào)器的雙音多頻收發(fā)器 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 264K |
| 代理商： | MC145446 |
MC145446A
MOTOROLA
11
Table 3. Transmit Attenuator/AGC Gain Set
Truth Table
A3
A2
A1
A0
Attenuation
(dB)
AGC Gain
Step (dB)
0
0
0
0
0
– 5.0
0
0
0
1
1
– 2.5
0
0
1
0
2
0.0
0
0
1
1
3
2.5
0
1
0
0
4
5.0
0
1
0
1
5
7.5
0
1
1
0
6
10.0
0
1
1
1
7
12.5
1
0
0
0
8
15.0
1
0
0
1
9
17.5
1
0
1
0
10
20.0
1
0
1
1
11
Clamp
1
1
0
0
12
Automatic
1
1
0
1
13
—
1
1
1
0
14
—
1
1
1
1
15
—
Table 4. Tone Frequency Truth Table
T3/D3
T2/D2
T1/D1
T0/D0
Tone Frequency (Hz)
DTMF Mode
Tone Mode
Low
Group
High
Group
Keyboard
Equivalent
Single
0
0
0
0
941
1633
D
941
0
0
0
1
697
1209
1
697
0
0
1
0
697
1336
2
697
0
0
1
1
697
1477
3
697
0
1
0
0
770
1209
4
770
0
1
0
1
770
1336
5
770
0
1
1
0
770
1477
6
770
0
1
1
1
852
1209
7
852
1
0
0
0
852
1336
8
1336
1
0
0
1
852
1477
9
1477
1
0
1
0
941
1336
0
1336
1
0
1
1
941
1209
*
1209
1
1
0
0
941
1477
#
1477
1
1
0
1
697
1633
A
1633
1
1
1
0
770
1633
B
1633
1
1
1
1
852
1633
C
1633
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相關代理商/技術參數(shù) |
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|---|---|
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| MC145447P | 制造商:Motorola Inc 功能描述: |
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