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MC145446AFW
Single-Chip 300-Baud Modem with DTMF Transceiver
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The MC145446A is a silicon gate CMOS frequency shift keying (FSK)
modem intended for 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 contains the entire circuit that
provides a full–duplex or half–duplex 300–baud data communication over 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 Ω load
with a single 5 V power supply. The transmit level is controlled by the
programmable attenuator in 1 dB steps.
This device also includes a serial control interface and internal control and
status registers that permit a CPU to exercise the following built–in features: Single 5 V Power Supply Compatible with CCITT V.21 DTMF Generator and Receiver for All 16 Standard Digits Capable of Driving 0 dBm into a 600 Ω Load (VCC = 5 V) AGC (Auto Gain Control) Amplifier for DTMF Receiver Imprecise Call Progress Tone (400 Hz) Detector A Transmit Attenuator Programmable in 1 dB Steps 2100 Hz Answer Tone Generator Serial Control Interface Analog Loopback Configuration for Self Test Power–Down Mode, Less than 1 μA
This document contains information on a new product. Specifications and information herein are subject to change without notice.
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SEMICONDUCTOR TECHNICAL DATA
