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 seria...

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