MC145444_ARCHIVED中文资料300-Baud CCITT V.21 Single-Chip Modem with DTMF Generator数据手册恩XP规格书

描述 Description

Overview The MC145444 has been discontinued. Suggested replacement: none.The MC145444 is a silicon-gate CMOS frequency shift keying (FSK) modem intended for use withtelemeter systems or remote control systems over the telephone network. This device is compatible with CCITT V.21 and contains the entire circuit that provides a full-duplexor half-duplex 300-baud data communication over a pair of telephone lines. This device also includesthe DTMF generator and call progress tone detector (CPTD). The differential line driver has the capability of driving 0 dBm into a 600 ohm load with a single5 V power supply. The transmit level is controlled by the programmable attenuator in 1 dB steps. Devices functions are controlled through a 3-wire serial interface.  

特性 Features

\t•Capable of Driving 0 dBm into a 600 ohm Load
\t•DTMF Generator On-Chip
\t•Imprecise Call Progress Detector On-Chip
\t•A Transmit Attenuator Programmable in 1 dB Steps
\t•3-Wire Serial Interface
\t•Compatible with CCITT V.21
\t•2100 Hz Answer Tone Generator On-Chip
\t•Analog Loopback Configuration for Self Test
\t•Simplex, Half-Duplex, and Full-Duplex Operation