MC145740 Datasheet (Motorola) - Dual Tone Multiple Frequency Line Interface

MC145740, Dual Tone Multiple Frequency Line Interface

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.

Note that the DSI input, if used, must be controlled for the output leve

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

MC145740 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 2