MC145446AFW 查看數據表（PDF） - Motorola => Freescale

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MC145446AFW

Single-Chip 300-Baud Modem with DTMF Transceiver

Motorola => Freescale 

AGC OUT

BLOCK DIAGRAM

FLTC2 FLTC3 FLTC1

DTMF

IN

AGC

RxBO

RxA

RxGC

30 k

+

–

65 k

NOISE

FILTER

NOISE

FILTER

LOW–BAND

BPF

HIGH–BAND

BPF

FREQUENCY

DETECTER

CODE

4 STATUS

CONVERTER REGISTER

(DECODER)

TIMING

CIRCUIT

SD/CD/DV

FSK/DTMF LOOPBACK PATH

TxD

FSK

MODULATOR

TLA

LEVEL

CONTROL

DTMF

GENERATOR

LOW–BAND

BPF

MUX

HIGH–BAND

BPF

MUX

MUX/

MIXING

CARRIER/CPT

DETECTOR

CDA

FSK

DEMODULATOR

RxD

DATA

I/O

R/W

MODE CONTROL

LOGIC

CONTROL

SHIFT REGISTER

STATUS

SHIFT REGISTER

SMOOTHING

FILTER

DSI

–1

TxA2

_

+

TxA1

E

POWER–ON ANALOG GROUND

CLOCK

SCK

RESET

GENERATOR

GENERATOR

VCC GND Vref

X1 X2

MC145446A

2

MOTOROLA

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