TEA1069 datasheet(8/44 Pages) PHILIPS

8 / 44 page

1998 Jan 08

Philips Semiconductors

Product speciﬁcation

Versatile speech/dialler/ringer with

music-on-hold

TEA1069; TEA1069A

Fig.4 Supply arrangement.

handbook, full pagewidth

MBH197

SLPE

STAB

REG

peripheral

circuits

0.5 mA

Rline

Rexch

Vexch

Iline

ICC

VCC

VEE

ISLPE + 0.5 mA

ISLPE

TEA1069

TEA1069A

Thus, the regulated voltage on the line terminal (VLN) can

be calculated as:

, where

Vref is the internally generated temperature compensated

reference voltage of 3.7 V and R9 is an external resistor

connected between SLPE and VEE.

The circuit has an internal current stabilizer operating at a

level determined by resistor R5 connected between STAB

and VEE.

In normal use the value of R5 would be 3.6 k

Ω and the

value of R9 would be 20

Ω.

Changing the value of R5 or R9 will affect microphone

gain, DTMF gain, gain control characteristics, sidetone

level, maximum output swing on LN and the DC

characteristics (especially at low line current).

At line currents below 9 mA the internal reference voltage

is automatically adjusted to a lower value (typically 1.6 V

ref

SLPE

line

0.5

–





–

at 1 mA). This means that more sets can be operated in

parallel with DC line voltages (excluding the polarity guard)

down to an absolute minimum voltage of 1.6 V. At line

currents below 9 mA the circuit has limited sending and

receiving levels.

Under normal conditions, when ISLPE >> ICC + 0.5 mA + Ip,

the static behaviour of the circuit is that of a 3.7 V regulator

diode (Vref) with an internal resistance equal to that of R9.

In the audio frequency range the dynamic impedance is

largely determined by R1. Figure 5 shows the equivalent

impedance of the circuit.

Current (Ip) available from VCC for the dialler part and

peripheral circuits depends on the external components

used. Figure 6 shows this current for VCC > 2.2 V. When

MUTE is HIGH i.e. when the receiving amplifier (supplied

from VCC) is driven, the available current is further

reduced. Current availability can be increased by

connecting the supply IC TEA1081 in parallel with R1, or

by increasing the DC line voltage by means of an external

resistor (RVA = R60) connected between REG and SLPE.

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