MC145745FW Просмотр технического описания (PDF) - Motorola => Freescale

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MC145745FW

V.21/V.23 Telemeter Modem

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

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V.21/V.23 Telemeter Modem

The MC145745 is a selectable modem chip compatible with ITU V.21

(300 baud full duplex asynchronous) and V.23 mode 2 (1200 baud half duplex

asynchronous). The built–in differential line driver has the capability of driving

0 dBm into a 600 Ω load with a 5 V single power supply. This device also

includes a DTMF generator, DTMF receiver, call–progress tone detector,

answer tone generator, and a receive timing control circuit.

Besides having a clock generator with a crystal oscillator connected to it, the

device has a divider circuit to which input of a double frequency clock is possible

from external sources, such as from a microcontroller unit (MCU). The serial

control port (SCP) permits the MCU to access internal registers for exercising

the built–in features.

A low consumption device, the MC145745 integrates various functions in a

small package. This modem IC is best suited for telemeter and other

applications of this type.

• Conforms to ITU V.21 and V.23 Recommendations

• DTMF Generator and Receiver for all 16 Standard Digits

• Capable of Driving 0 dBm into a 600 Ω Load (VCC = 5 V)

• Automatic Gain Control (AGC) Amplifier for the DTMF Receiver

• Call–Progress Tone Detector

• Four–Wire Serial Data Interface (SCP)

• Programmable Transmission and Carrier Detection Levels

• FSK/DTMF Analog Loopback Self–Test Function

• Crystal Oscillator (3.579545 MHz) and Half Divider Circuit (7.159090 MHz)

for External Inputs

• Operates in the Voltage Range of 3.3 – 5.5 V

• Power Down Mode (ICC < 1 µA)

Order this document

by MC145745/D

MC145745

28

1

FW SUFFIX

SOIC

CASE 751M

ORDERING INFORMATION

MC145745FW SOIC

PIN ASSIGNMENT

GND 1

Vref 2

CDA 3

TLA 4

TEST 1 5

RxD 6

TxD 7

CD 8

CLKO 9

X1 10

X2 11

ECLK 12

PB0 13

GND 14

28 VCC

27 RxA

26 TxA1

25 TxA2

24 TEST 2

23 SCPEN

22 SCPCLK

21 SCP Rx

20 SCP Tx

19 RESET

18 PB3

17 PB2

16 PB1

15 VCC

This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.

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©MOMoTtoOroRla,OInLc.A1996

MC145745

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