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MC145745 - V.21/V.23 Telemeter Modem

General Description

Pin Location 1, 14 2 3 Symbol GND Vref CDA Type Description Ground

These are the ground pins of the digital and the analog circuits.

The 0 V potential of the device is determined by the input voltage at these pins.

This pin p

Key Features

  • A low consumption device, the MC145745 integrates various functions in a small package. This modem IC is best suited for telemeter and other.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145745/D MC145745 Product Preview 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).