TEA1069 datasheet(11/44 Pages) PHILIPS

11 / 44 page

1998 Jan 08

Philips Semiconductors

Product speciﬁcation

Versatile speech/dialler/ringer with

music-on-hold

TEA1069; TEA1069A

Fig.8 Alternative receiver arrangements.

Pin numbers in parenthesis refer to the TEA1069H and TEA1069AH.

(1) Resistor may be connected to prevent distortion (inductive load).

(2) Resistor is required to increase the phase margin (capacitive load).

a. Dynamic earpiece.

b. Magnetic earpiece.

c. Piezoelectric earpiece.

k, full pagewidth

(1)

(2)

1 (39)

23 (18)

1 (39)

23 (18)

1 (39)

23 (18)

MBH199

VEE

DUAL TONE MULTI-FREQUENCY INPUT DTMF

When the DTMF input is enabled (MUTE is LOW) dialling

tones may be sent on to the line. The voltage gain from

DTMF to LN is typically 25.5 dB (when R7 = 68 k

Ω) and

varies with R7 in the same way as the microphone gain.

The tones can be heard in the earpiece at a low level

(confidence tone).

AUTOMATIC GAIN CONTROL INPUT AGC

Automatic line loss compensation is achieved by

connecting a resistor (R6) between AGC and VEE.

The automatic gain control varies the gain of the

microphone amplifier and the receiving amplifier in

accordance with the DC line current.

The control range is 5.8 dB which corresponds to a line

length of 5 km for a 0.5 mm diameter twisted-pair copper

cable with a DC resistance of 176

Ω/km and average

attenuation of 1.2 dB/km. Resistor R6 should be chosen in

accordance with the exchange supply voltage and its

feeding bridge resistance (see Fig.9 and Table 1).

The ratio of start and stop currents of the AGC curve is

independent of the value of R6. If no automatic line-loss

compensation is required the AGC pin may be left

open-circuit. The amplifiers, in this condition, will give their

maximum specified gain.

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