參數(shù)資料
型號: HD4074629
廠商: Hitachi,Ltd.
英文描述: AS Microcomputer Incorporating a DTMF Generator Circuit(微計算機帶雙音多頻發(fā)生器電路)
中文描述: 由于微機安裝有雙音多頻發(fā)電機斷路器(微計算機帶雙音多頻發(fā)生器電路)
文件頁數(shù): 102/155頁
文件大小: 549K
代理商: HD4074629
HD404629R Series
102
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 92 shows the tone output equivalent circuit. Figure 93 shows the output waveform. One cycle of
this wave consists of 32 slots. Therefore, the output waveform is stable with little distortion. Table 30 lists
the frequency deviation of the MCU from standard DTMF signals.
Table 30 Frequency Deviation of the MCU from Standard DTMF
Standard DTMF (Hz)
697
770
852
941
1,209
1,336
1,477
1,633
MCU (Hz)
694.44
769.23
851.06
938.97
1,212.12
1,333.33
1,481.48
1,639.34
Deviation from Standard (%)
–0.37
–0.10
–0.11
–0.22
0.26
–0.20
0.30
0.39
R1
R2
R3
R4
C1
C2
C3
C4
Note:
This frequency deviation value does not include the frequency deviation due to the oscillator
element. Also note that in this case the ratio of the high level and low level widths in the oscillator
waveform due to the oscillator element will be 50%:50%.
VT
GND
ref
Switch control
TONER
TONEC
Figure 92 Tone Output Equivalent Circuit
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