MC145442B 查看數據表（PDF） - Motorola => Freescale

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MC145442B

Single–Chip 300–Baud Modem

Motorola => Freescale 

RxA2 15

RxA1 16

TxD 11

RxA2 15

RxA1 16

TxD 11

RxA2 15

RxA1 16

TxD 11

RxA2 15

RxA1 16

TxD 11

–

LOW–BAND

+

AAF S/H

BPF

CARRIER

DETECT

3 CD

AC

AMP

DEMOD

5 RxD

1

DSI

MODULATOR

HIGH–BAND

BPF

SMOOTHING

FILTER

–

+

(a) Originate/Channel 1 Mode (MODE = High, LB = Low)

17 TxA

18

Exl

–

AAF S/H

LOW–BAND

+

BPF

CARRIER

DETECT

3 CD

AC

AMP

DEMOD

5 RxD

1 DSI

MODULATOR

HIGH–BAND

SMOOTHING

–

BPF

FILTER

+

(b) Answer/Channel 2 Mode (MODE = Low, LB = Low)

17 TxA

18 Exl

–

+

AAF S/H

LOW–BAND

BPF

CARRIER

DETECT

AC

AMP

DEMOD

MODULATOR

HIGH–BAND

BPF

SMOOTHING

FILTER

–

+

(c) Originate/Channel 1 Mode and Analog Loopback State (MODE = High, LB = Low)

–

AAF S/H

+

LOW–BAND

BPF

CARRIER

DETECT

AC

AMP

DEMOD

MODULATOR

HIGH–BAND

BPF

SMOOTHING

FILTER

–

+

(d) Answer/Channel 2 Mode and Analog Loopback State (MODE = Low, LB = Low)

Figure 4. Basic Operating Modes

3 CD

5 RxD

1 DSI

17 TxA

18 Exl

3 CD

5 RxD

1 DSI

17 TxA

18 Exl

MOTOROLA

MC145442B•MC145443B

7

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