PCD3312CT datasheet(3/28 Pages) PHILIPS

3 / 28 page

1996 Nov 21

Philips Semiconductors

Product speciﬁcation

DTMF/modem/musical-tone generators

PCD3311C; PCD3312C

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).

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.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL

PARAMETER

MIN.

TYP.

MAX.

UNIT

VDD

operating supply voltage

2.5

−

6.0

IDD

operating supply current

−−

0.9

Istb

standby current

−−

µA

VHG(RMS)

DTMF HIGH group output voltage level (RMS value)

158

192

205

VLG(RMS)

DTMF LOW group output voltage level (RMS value)

125

150

160

pre-emphasis (voltage gain) of group

1.85

2.10

2.35

THD

total harmonic distortion

−−25

−

Tamb

operating ambient temperature

−25

−

+70

°C

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCD3311CP

DIP14

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

SOT27-1

PCD3311CT

SO16

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

SOT162-1

PCD3312CP

DIP8

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

SOT97-1

PCD3312CT

SO8

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

SOT176-1

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