TEA1069 datasheet(7/44 Pages) PHILIPS

7 / 44 page

1998 Jan 08

Philips Semiconductors

Product speciﬁcation

Versatile speech/dialler/ringer with

music-on-hold

TEA1069; TEA1069A

Fig.3 Pin configuration (SOT307-2).

handbook, full pagewidth

TEA1069H

TEA1069AH

MBH784

DTMF

KT/EARTH

CSI

XTAL1

XTAL2

RESET

CE/FDI

COL6

COL5

COL4

VEE

MUTE

DIODE

VCC

REG

ROW3

ROW2

ROW4

ROW5

VEE

ROW1

FUNCTIONAL DESCRIPTION

Speech part

For numbering of components refer to Figs 28 and 29.

SUPPLIES VCC, LN, SLPE, REG AND STAB

Power for the IC and its peripheral circuits is usually

obtained from the telephone line (see Fig.4).

The circuit creates a stabilized voltage (Vref = 3.7 V)

between LN and SLPE. This reference voltage is

temperature compensated and can be adjusted by means

of an external resistor RVA. It can be increased by

connecting an RVA resistor (R60) between REG and SLPE

or decreased by connecting an RVA resistor (R61)

between REG and LN. This internal voltage reference is

decoupled by capacitor C3 between REG and VEE.

This decoupling capacitor realises the set impedance

conversion from its DC value to its AC value in the audio

frequency range.

The internal transmission part of the circuitry (including the

earpiece amplifier) is supplied from VCC. This voltage

supply is derived from the LN voltage via a dropping

resistor (R1) and must be decoupled by a capacitor (C1)

between VCC and VEE. This supply point may also be used

to supply the dialler/ringer (VDD) part or external circuit e.g.

electret microphone.

The DC current flowing into the set is determined by the

exchange supply voltage Vexch, the feeding bridge

resistance Rexch and the DC resistance of the telephone

line Rline. When the line current (Iline) is more than 0.5 mA

greater than the sum of the IC supply current (ICC) and the

current drawn by the peripheral circuitry connected to VCC

(Ip), the excess current is shunted to SLPE via LN.

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