PCD3311CP - DTMF/modem/musical-tone generators

The PCD3311C and PCD3312C are single-chip silicon

gate CMOS integrated circuits. They are intended

principally for use in telephone sets to provide the

dual-tone multi-frequency (DTMF) combinations required

for tone dialling systems. The various audio output

frequencies are generated from an on-chip 3.58 MHz

quartz crystal-controlled oscillator. A separate crystal is 

used, and a separate microcontroller is required to control

the devices.

Both the devices can interface to I2C-bus compatible

microcontrollers for serial input. The PCD3311C can also

interface directly to all standard microcontrollers,

accepting a binary coded parallel input.

With their on-chip voltage reference the PCD3311C and

PCD3312C provide constant output amplitudes which are

independent of the operating supply voltage and ambient

temperature.

An on-chip filtering system assures a very low total

harmonic distortion in accordance with CEPT

recommendations.

In addition to the standard DTMF frequencies the devices

can also provide:

• Twelve standard frequencies used in simplex modem

applications for data rates from 300 to 1200 bits per

second

• Two octaves of musical scales in steps of semitones

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