參數(shù)資料
型號(hào)： HD404668
廠商： Hitachi,Ltd.
英文描述： Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計(jì)算機(jī))
中文描述： 低電壓如同在微機(jī)芯片的DTMF產(chǎn)生電路（帶雙音多頻電路的低電壓微計(jì)算機(jī)）
文件頁數(shù)： 96/142頁
文件大?。?/td> 894K
代理商： HD404668
HD404669 Series
96
DTMF Output:
The sine waves of the row-group and column-group are output from the DTMF output
pins (TONER and TONEC). These are output by a high-precision resistance-ladder type D/A converter.
Figure 74 shows the TONE output pin equivalent circuit, and figure 75 shows the output waveform. One
output waveform cycle is composed of 32 slots, giving stable output with a low distortion factor. Table 21
shows the deviation of the output frequencies with respect to the standard DTMF signals.
Table 21 Frequency Deviation of the MCU from Standard DTMF
(
f
OSC
=400kHz
,
800kHz
,
2MHz
,
4MHz
,
8MHz
)
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
Table 22 Frequency Deviation of the MCU from Standard DTMF (
f
OSC
=3.58kHz
,
7.16MHz
)
Standard DTMF (Hz)
MCU (Hz)
Deviation from Standard (%)
R1
697
690.58
–0.92
R2
770
764.96
–0.65
R3
852
846.33
–0.67
R4
941
933.75
–0.77
C1
1,209
1,205.39
–0.30
C2
1,336
1,325.92
–0.75
C3
1,477
1,473.25
–0.25
C4
1,633
1,630.23
–0.17
Notes: 1. The DTMF signal frequency deviation must be within
±
1.5%, totaling the values in tables 21 and
22 and the precision of the oscillator used. When an f
OSC
frequency of 3.58 MHz or 7.16 MHz is
used, in particular, the frequency deviation is greater (max - 0.92%) than with an f
OSC
frequency
of 400 kHz, 800 kHz, 2 MHz, 4 MHz, or 8 MHz, and thorough consultation with the oscillator
manufacturer is essential before deciding on the oscillator to be used.
2. This frequency deviation does not include the frequency deviation of the oscillator. Also, the
ratio of oscillator waveform high-level width and low-level width in this case is 50% : 50%.
相關(guān)PDF資料
PDF描述
HD404669 Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計(jì)算機(jī))
HD407A4669 Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計(jì)算機(jī))
HD404719FS Five timer/counters
HD404439FS Five timer/counters
HD4074719FS Five timer/counters
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD404668H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HD404676H 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*