MC145446A-ARCHIVED中文资料300-Baud CCITT V.21 Single-Chip Modem with DTMF Transceiver and Call Progress Detection数据手册恩XP规格书

描述 Description

Overview The MC145446A has been discontinued. Suggested replacement: none. The MC145446A is a silicon gate CMOS frequency shift keying (FSK) modem intendedfor use with telemeter systems or remote control systems over the telephone network.It replaces the MC145446. This device is compatible with CCITT V.21 and containsthe entire circuit that provides a full-duplex or half-duplex 300-baud data communicationover a pair of telephone lines. This device also includes the DTMF generator/receiver and call progress tone detector (CPTD).The differential line driver has the capability of driving 0 dBm into a 600 ohm loadwith a single 5 V power supply. The transmit level is controlled by the programmableattenuator in 1 dB steps.This device also includes a serial control interface and internal control and statusregisters that permit a CPU to exercise its built-in features.  

特性 Features

\t•Single 5 V Power Supply
\t•Compatible with CCITT V.21
\t•DTMF Generator and Receiver for All 16 Standard Digits
\t•Capable of Driving 0 dBm into a 600 ohm Load (VCC = 5 V)
\t•AGC (Auto Gain Control) Amplifier for DTMF Receiver
\t•Imprecise Call Progress Tone (400 Hz) Detector
\t•A Transmit Attenuator Programmable in 1 dB Steps
\t•2100 Hz Answer Tone Generator
\t•Serial Control Interface
\t•Analog Loopback Configuration for Self Test
\t•Power-Down Mode, Less than 1 micro Amp