參數(shù)資料
型號: HD407A4639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 103/133頁
文件大?。?/td> 803K
代理商: HD407A4639R
HD404639R Series
103
DTMF Output:
The sine waves of the row-group and column-group are individually converted in the D/A
conversion circuit which provides a high-precision ladder resistance. The DTMF output pins (TONER,
TONEC) transmit the sine waves of the row-group and column-group, respectively. Figure 87 shows the
tone output equivalent circuit. Figure 88 shows the output waveform. One cycle of this wave consists of 32
slots. Therefore, the output waveform is stable with little distortion. Table 28 lists the frequency deviation
of the MCU from standard DTMF signals.
Switch control
VT
GND
ref
TONER
TONEC
Figure 87 Tone Output Equivalent Circuit
VT
ref
GND
Time slots
1 2 3 4 5 6 7 8 9 10 11121314151617 1819202122232425262728 29303132
Figure 88 Waveform of Tone Output
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