MC145745FW datasheet(7/16 Pages) MOTOROLA

7 / 16 page

MC145745

MOTOROLA

7

Figure 1. Out–of–Band Level

– 55

– 15 dB/OCT.

f (Hz)

256 k

16 k

4 k

3.4 k

0

– 25

Figure 2. FSK, DTMF, and CPT Carrier Detection Timing

Von

Voff

RxA

CD

toff

ton

Figure 3. DTMF Frequency Detection 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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