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參數(shù)資料
| 型號(hào)： | M3541 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Single Number Pulse Tone Switchable Dialer(脈沖語音開關(guān)撥號(hào)器) |
| 中文描述： | 單數(shù)脈沖切換撥號(hào)音（脈沖語音開關(guān)撥號(hào)器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 165K |
| 代理商： | M3541 |
Figure 4.
TONEOUTPUT
Facility has been made for tone filtering as shown
below. This alsoallows the userto adjust toneam-
plitudesas required.The toneamplitude is propor-
tionaltothechipsupplyvoltage,V
DD
, andcanbead-
justedby changingthe ratio of R3 andR4.
TYPICAL VALUES
R
1
= 56k
R
2
= 56k
R
3
+ R
4
=10k
C
1
= 1.3nF
C
2
= 470pF
The filter components shown have been chosen to give a second order Butterworth response with a cut-off frequency of
about 3.5kHz. The pass-band insertion loss is nominally 0.5dB.
DTMFAPPLICATION CIRCUITS
TheDTMFcircuitinfigure5usesa constantcurrent
supply and a 2.5V reference diode to producethe
stabilisedsupply voltage which determinesthe MF
tone level of the M3541. If the speech circuit pro-
vides a stabilised voltage, then figure6 showshow
it may be usedto powerthe M3541.Diode D1 pre-
vents the speech circuit from taking current whilst
the telephoneis on-hook,and D2 compensatesfor
the voltagedropped across D1 when off-hook.
M3541
7/12
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