MC145446AFW datasheet(7/14 Pages) MOTOROLA

Il numero della parte	MC145446AFW

Spiegazioni elettronici	SINGLE-CHIP 300-BAUD MODEM WITH DTMF TRANSCEIVER

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Produttore elettronici	MOTOROLA [Motorola, Inc]

Homepage	http://www.freescale.com

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7 / 14 page

MC145446A

MOTOROLA

7

Figure 2. Out–of–Band Energy

– 55

– 15 dB/OCT.

f (Hz)

256 k

16 k

4 k

3.4 k

0

– 25

Figure 3. FSK, DTMF Carrier Detect Timing

Von

Voff

RxA, DTMF IN

SD/DV/CD

toff

ton

Figure 4. DTMF Frequency Detect Bandwidth

NO–DETECT

DETECT MINIMUM

WIDTH

NO–DETECT

– 3.5%

– 1.5% – 2 Hz

+ 1.5% + 2 Hz

+ 3.5%

fo

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