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參數資料
| 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： | 5/12頁 |
| 文件大?。?/td> | 141K |
| 代理商： | MC145740F |
MC145740
MOTOROLA
5
Figure 1. Out–of–Band Energy
3.4 k
4 k
16 k
256 k
f (Hz)
– 15 dB/OCT.
T
0
0
– 25
– 55
Figure 2. DTMF Detect Timing
“C”
“A”
“B”
“D”
RxA
TD
DV
D0 – D3
(NOTE 1)
(NOTE 2)
(NOTE 3)
ton
1
10 mS
toff
ton
DTMF TONE CHANGED WITHOUT SILENT PERIOD
“A”
“B”
“C”
“D”
NOTES:
1. The high–to–low and low–to–high transition on the TD pin will appear immediately after the valid DTMF
tones are detected. The TD will also output a short H pulse when the device detects the DTMF tones
being changed without a silent period.
2. The high–to–low and low–to–high transition on the DV pin will appear after the programmed guard time
determined by two bits of serial data (CD1, CD0).
3. The device recognizes the DTMF tones changed without a silent period, and the four bits of data can
be read from the status register.
NO DETECT
NO DETECT
DETECT MINIMUM
WIDTH
– 3.5%
+ 3.5%
– 1.5% – 2 Hz
+ 1.5% + 2 Hz
LO
Figure 3. DTMF Frequency Detect Band Width
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