MC145745FW 데이터 시트보기 (PDF) - Motorola => Freescale
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MC145745FW Datasheet PDF : 16 Pages
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0
3.4 k 4 k
16 k
0
– 25
– 15 dB/OCT.
256 k
f (Hz)
– 55
Figure 1. Out–of–Band Level
Von
Voff
RxA
ton
toff
CD
Figure 2. FSK, DTMF, and CPT Carrier Detection Timing
NO–DETECT
DETECT MINIMUM
WIDTH
NO–DETECT
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
– 3.5%
+ 3.5%
– 1.5% – 2 Hz
fo
+ 1.5% + 2 Hz
Figure 3. DTMF Frequency Detection Bandwidth
MOTOROLA
MC145745
7
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