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componentes Descripción

Fabricante

PCD3312

DTMF/modem/musical-tone generators

Philips Electronics 

Philips Semiconductors

DTMF/modem/musical-tone generators

Product specification

PCD3311C; PCD3312C

1 FEATURES

• DTMF, modem and musical tone generation

• Stabilized output voltage level

• Low output distortion with on-chip filtering conforming to

CEPT recommendations

• Latched inputs for data bus applications

• I2C-bus compatible

• Selection of parallel or serial (I2C-bus) data input

(PCD3311C).

2 GENERAL DESCRIPTION

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.

3 QUICK REFERENCE DATA

SYMBOL

PARAMETER

VDD

IDD

Istb

VHG(RMS)

VLG(RMS)

Gv

THD

operating supply voltage

operating supply current

standby current

DTMF HIGH group output voltage level (RMS value)

DTMF LOW group output voltage level (RMS value)

pre-emphasis (voltage gain) of group

total harmonic distortion

Tamb

operating ambient temperature

MIN.

2.5

−

−

158

125

1.85

−

−25

TYP.

−

−

−

192

150

2.10

−25

−

MAX.

6.0

0.9

3

205

160

2.35

−

+70

UNIT

V

mA

µA

mV

mV

dB

dB

°C

4 ORDERING INFORMATION

TYPE NUMBER

PCD3311CP

PCD3311CT

PCD3312CP

PCD3312CT

NAME

DIP14

SO16

DIP8

SO8

PACKAGE

DESCRIPTION

plastic dual in-line package; 14 leads (300 mil)

plastic small outline package; 16 leads; body width 7.5 mm

plastic dual in-line package; 8 leads (300 mil)

plastic small outline package; 8 leads; body width 7.5 mm

VERSION

SOT27-1

SOT162-1

SOT97-1

SOT176-1

1996 Nov 21

3

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