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MC145740 - Dual Tone Multiple Frequency Line Interface

General Description

TxA1 Non Inverting Analog Output (Pin 1) This pin is the line driver non

inverting output.

A + 7 dBm (typ) differential output voltage can be obtained by connecting a 1.2 kΩ load resistor between TxA1 and TxA2.

Key Features

  • Single Power Supply: 3.6 to 5.5 V DTMF Generator and Receiver for All 16 Standard Digits 0 dBm Line Driver Into 600 Ω Load AGC Amplifier Programmable Transmit Attenuator Serial Control Interface Power Down Mode, Less Than 1 µA 20 1 F SUFFIX SOG.

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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 MC145740/D MC145740 Product Preview Dual Tone Multiple Frequency Line Interface The MC145740 is a silicon gate HCMOS LSI designed for general purpose Dual Tone Multiple Frequency (DTMF) communications, and contains a DTMF signal generator and a receiver for all 16 standard digits. The generator block has a differential line driver which drives a 600 Ω load with 0 dBm level. The transmit signal level is adjusted in 1 dB steps by the programmable attenuator. The receiver block has an Auto Gain Control (AGC) amplifier to demodulate 50 dB (typ) dynamic range of DTMF signals to the hexadecimal codes. The device also includes a serial control interface that permits a CPU to exercise the following built–in features.