MC145444 Datasheet (Motorola) - Single-Chip 300-Baud Modem

MC145444, Single-Chip 300-Baud Modem

VCC Positive Power Supply (Pin 15) This pin is normally tied to the + 5.0 V.

A 0.1 µF decoupling capacitor should be used.

GND Ground Pin (Pin 5) This pin is normally tied to 0 V.

GNDA Analog Ground (Pin 3) Analog ground is internally biased to (VCC * VSS) / 2.

It should be tied to ground th

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145444/D MC145444 Advance Information Single-Chip 300-Baud Modem MC145444 is a silicon gate CMOS frequency shift keying (FSK) modem intended for use with telemeter 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 duplex or half duplex 300 baud data communication over a pair of telephone lines.

This d

MC145444 Features

* a 1.2 kΩ load resistor between Tx1 and Tx2. Attention must be set so as not to exceed this level when an external input is added to the DSI pin. A telephone line (600 Ω) is driven through an external 600 Ω resistor. In this case, the output level becomes about half of differential output. PIN DESC