TEA1111A datasheet(8/24 Pages) PHILIPS

部品番号	TEA1111A

部品情報	Speech circuit with dialler interface, regulated supply and earpiece volume control

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メーカー	PHILIPS [NXP Semiconductors]

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8 / 24 page

1999 Nov 22

8

Philips Semiconductors

Product speciﬁcation

Speech circuit with dialler interface, regulated

supply and earpiece volume control

TEA1111A

LED control (pin LEDC)

The TEA1111A gives an on-hook/off-hook status

indication. This is achieved by a current made available at

pin LEDC to drive an external LED circuit connected

between pins SLPE and LN (see Fig.7). In the low voltage

area, which corresponds to low line current conditions, no

current is available for this LED. For line currents higher

than a threshold, the LEDC current increases

proportionally to the line current (with a ratio of 1:150).

The LEDC current is internally limited to 470

µA

(see Fig.8).

For 12 mA < Iline < 82 mA:

This LED circuit is referenced to SLPE. Consequently, all

the LED supply current will flow through the RSLPE resistor,

and does not affect the behaviour of the AGC.

Set impedance

In the audio frequency range, the dynamic impedance is

mainly determined by the RCC resistor. The equivalent

impedance of the circuit is illustrated in Fig.9.

I

LEDC

I

line

12

–

150

---------------------

=

FCA056

2.4

k

Ω

24

Ω

BC858B

LN

LEDC

SLPE

Fig.7 LED circuit configuration.

handbook, halfpage

0

20

40

100

500

0

400

FCA057

60

80

300

200

100

ILEDC

(

µA)

Iline (mA)

Fig.8 LEDC current versus line current.

handbook, halfpage

LN

VEE

SLPE

RSLPE

CREG

REG

VCC

RCC

4.7

µF

100

µF

CVCC

619

Ω

20

Ω

RP

Vref

LEQ

MBE788

Fig.9 Equivalent impedance between LN and VEE.

LEQ =CREG × RSLPE × RP.

RP = internal resistance.

RP = 17.5 kΩ.

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